chore(release): v0.7.3

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Aaron Klinker <aaronklinker1@gmail.com>

.codecov.yml

@@ -0,0 +1,6 @@
+coverage:
+  status:
+    project:
+      default:
+        target: 80%
+        threshold: 1%

.gitignore

@@ -17,5 +17,6 @@ web-ext.config.ts
 templates/*/pnpm-lock.yaml
 templates/*/yarn.lock
 templates/*/package-lock.json
-docs/config.md
+docs/api/config.md
+docs/api/cli.md
 stats.html

.prettierignore

@@ -12,3 +12,4 @@ CHANGELOG.md
 *.svg
 *.txt
 _gitignore
+_redirects

CHANGELOG.md

@@ -1,5 +1,77 @@
 # Changelog
 
+## v0.7.3
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/v0.7.2...v0.7.3)
+
+### 🚀 Enhancements
+
+- Support JS entrypoints ([#155](https://github.com/wxt-dev/wxt/pull/155))
+
+## v0.7.2
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/v0.7.1...v0.7.2)
+
+### 🚀 Enhancements
+
+- Allow customizing entrypoint options per browser ([#154](https://github.com/wxt-dev/wxt/pull/154))
+
+### 🩹 Fixes
+
+- Default safari to MV2 ([5807931](https://github.com/wxt-dev/wxt/commit/5807931))
+- Add missing `persistent` type to `defineBackgroundScript` ([d9fdcb5](https://github.com/wxt-dev/wxt/commit/d9fdcb5))
+
+### 📖 Documentation
+
+- Restructure website to improve UX ([#149](https://github.com/wxt-dev/wxt/pull/149))
+- Add docs for development and testing ([f58d69d](https://github.com/wxt-dev/wxt/commit/f58d69d))
+
+### 🏡 Chore
+
+- **deps-dev:** Bump @types/fs-extra from 11.0.1 to 11.0.2 ([#144](https://github.com/wxt-dev/wxt/pull/144))
+- **deps-dev:** Bump @faker-js/faker from 8.0.2 to 8.1.0 ([#146](https://github.com/wxt-dev/wxt/pull/146))
+- **deps-dev:** Bump vitest-mock-extended from 1.2.1 to 1.3.0 ([#147](https://github.com/wxt-dev/wxt/pull/147))
+- **deps-dev:** Bump vitest from 0.34.3 to 0.34.6 ([#145](https://github.com/wxt-dev/wxt/pull/145))
+- **deps-dev:** Bump typescript from 5.1 to 5.2 ([#148](https://github.com/wxt-dev/wxt/pull/148))
+
+## v0.7.1
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/v0.7.0...v0.7.1)
+
+### 🚀 Enhancements
+
+- `createContentScriptUi` helper ([#143](https://github.com/wxt-dev/wxt/pull/143))
+
+### 📖 Documentation
+
+- Add docs for `createContentScriptUi` ([65fcfc0](https://github.com/wxt-dev/wxt/commit/65fcfc0))
+
+### 🏡 Chore
+
+- **release:** V0.7.1-alpha1 ([2d4983e](https://github.com/wxt-dev/wxt/commit/2d4983e))
+
+## v0.7.0
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/v0.6.6...v0.7.0)
+
+### 🚀 Enhancements
+
+- Content script `cssInjectionMode` ([#141](https://github.com/wxt-dev/wxt/pull/141))
+
+### 🩹 Fixes
+
+- Validate transformed manifest correctly ([4b2012c](https://github.com/wxt-dev/wxt/commit/4b2012c))
+- ⚠️  Output content script CSS to `content-scripts/<name>.css` ([#140](https://github.com/wxt-dev/wxt/pull/140))
+- Reorder typescript paths to give priority to `@` and `~` over `@@` and `~~` ([#142](https://github.com/wxt-dev/wxt/pull/142))
+
+### 🏡 Chore
+
+- Store user config metadata in memory ([0591050](https://github.com/wxt-dev/wxt/commit/0591050))
+
+#### ⚠️ Breaking Changes
+
+- ⚠️ Content script CSS used to be output to `assets/<name>.css`, but is now `content-scripts/<name>.css` to match the docs. ([#140](https://github.com/wxt-dev/wxt/pull/140))
+
 ## v0.6.6
 
 [compare changes](https://github.com/wxt-dev/wxt/compare/v0.6.5...v0.6.6)

README.md

@@ -5,15 +5,15 @@
 
 <p align="center">
   <a href="https://www.npmjs.com/package/wxt" target="_blank">
-    <img alt="npm" src="https://img.shields.io/npm/v/wxt?labelColor=black&color=%2353bc4a">
+    <img alt="npm" src="https://img.shields.io/npm/v/wxt?labelColor=black&color=%234fa048">
   </a>
   <span> </span>
-  <img alt="npm" src="https://img.shields.io/npm/dm/wxt?labelColor=black&color=%2353bc4a">
+  <img alt="npm" src="https://img.shields.io/npm/dm/wxt?labelColor=black&color=%234fa048">
   <span> </span>
-  <img alt="NPM" src="https://img.shields.io/npm/l/wxt?labelColor=black&color=%2353bc4a">
+  <img alt="NPM" src="https://img.shields.io/npm/l/wxt?labelColor=black&color=%234fa048">
   <span> </span>
   <a href="https://codecov.io/github/wxt-dev/wxt" target="_blank">
-    <img alt="Codecov" src="https://img.shields.io/codecov/c/github/wxt-dev/wxt?labelColor=black&color=%2353bc4a">
+    <img alt="Codecov" src="https://img.shields.io/codecov/c/github/wxt-dev/wxt?labelColor=black&color=%234fa048">
   </a>
 </p>
 
@@ -28,11 +28,11 @@
 <p align="center">
   <a href="https://wxt.dev" target="_blank">Get Started</a>
   &bull;
-  <a href="https://wxt.dev/get-started/installation.html" target="_blank">Installation</a>
+  <a href="https://wxt.dev/guide/installation.html" target="_blank">Installation</a>
   &bull;
-  <a href="https://wxt.dev/guide/background.html" target="_blank">Entrypoints</a>
+  <a href="https://wxt.dev/entrypoints/background.html" target="_blank">Entrypoints</a>
   &bull;
-  <a href="https://wxt.dev/config.html" target="_blank">Configuration</a>
+  <a href="https://wxt.dev/api/config.html" target="_blank">Configuration</a>
 </p>
 
 ![Example CLI Output](./docs/assets/cli-output.png)
@@ -45,7 +45,7 @@ Bootstrap a new project:
 pnpx wxt@latest init <project-name>
 ```
 
-Or see the [installation guide](https://wxt.dev/get-started/installation.html) to get started with WXT.
+Or see the [installation guide](https://wxt.dev/guide/installation.html) to get started with WXT.
 
 ## Features
 

demo/src/entrypoints/example-tsx.content.tsx

@@ -2,7 +2,17 @@ import ReactDOM from 'react-dom/client';
 
 export default defineContentScript({
   matches: ['<all_urls>'],
-  async main() {
+  async main(ctx) {
+    console.log(browser.runtime.id);
+    logId();
+
+    console.log('WXT MODE:', import.meta.env.MODE);
+
+    const n = (Math.random() * 100).toFixed(1);
+    ctx.setInterval(() => {
+      console.log(n, browser.runtime.id);
+    }, 1e3);
+
     const container = document.createElement('div');
     document.body.append(container);
 

demo/src/entrypoints/overlay.content/index.ts

@@ -1,18 +0,0 @@
-import '../../common/style.css';
-
-export default defineContentScript({
-  matches: ['<all_urls>'],
-  async main(ctx) {
-    console.log(browser.runtime.id);
-    logId();
-
-    console.log('WXT MODE:', import.meta.env.MODE);
-
-    const n = (Math.random() * 100).toFixed(1);
-    ctx.setInterval(() => {
-      console.log(n, browser.runtime.id);
-    }, 1e3);
-
-    mountContentScriptUi();
-  },
-});

demo/src/entrypoints/ui.content/index.ts

@@ -0,0 +1,24 @@
+import '../../common/style.css';
+import './style.css';
+
+export default defineContentScript({
+  matches: ['https://*.duckduckgo.com/*'],
+  cssInjectionMode: 'ui',
+
+  async main(ctx) {
+    const ui = await createContentScriptUi(ctx, {
+      name: 'demo-ui',
+      type: 'inline',
+      append: 'before',
+      anchor: 'form[role=search]',
+      mount: (container) => {
+        const app = document.createElement('div');
+        app.textContent = 'Custom content script UI';
+        container.append(app);
+      },
+    });
+    ui.mount();
+
+    setTimeout(ui.remove, 5000);
+  },
+});

demo/src/entrypoints/ui.content/style.css

@@ -0,0 +1,11 @@
+:root {
+  color-scheme: dark;
+  color: indianred;
+}
+html {
+  background-color: black;
+}
+
+div {
+  padding: 16px;
+}

docs/.vitepress/config.ts

@@ -1,5 +1,6 @@
 import { defineConfig } from 'vitepress';
 import { generateConfigDocs } from './plugins/generate-config-docs';
+import { generateCliDocs } from './plugins/generate-cli-docs';
 
 const title = 'Next-gen Web Extension Framework';
 const titleSuffix = ' – WXT';
@@ -17,7 +18,7 @@ export default defineConfig({
   description,
   vite: {
     clearScreen: false,
-    plugins: [generateConfigDocs()],
+    plugins: [generateConfigDocs(), generateCliDocs()],
   },
   lastUpdated: true,
   sitemap: {
@@ -55,56 +56,68 @@ export default defineConfig({
     },
 
     nav: [
-      { text: 'Get Started', link: '/get-started/installation.md' },
-      { text: 'Guide', link: '/guide/auto-imports.md' },
-      { text: 'Config', link: '/config.md' },
-      { text: 'API', link: '/api.md' },
+      { text: 'Guide', link: '/guide/installation.md' },
+      { text: 'Entrypoints', link: '/entrypoints/background.md' },
+      { text: 'API', link: '/api/cli.md' },
     ],
 
     sidebar: {
-      '/get-started/': [
-        {
-          text: 'Get Started',
-          items: [
-            { text: 'Introduction', link: '/get-started/introduction.md' },
-            { text: 'Installation', link: '/get-started/installation.md' },
-            { text: 'Configuration', link: '/get-started/configuration.md' },
-            { text: 'Entrypoints', link: '/get-started/entrypoints.md' },
-            { text: 'Assets', link: '/get-started/assets.md' },
-            { text: 'Build Targets', link: '/get-started/build-targets.md' },
-            { text: 'Publishing', link: '/get-started/publishing.md' },
-            { text: 'Testing', link: '/get-started/testing.md' },
-            { text: 'Compare', link: '/get-started/compare.md' },
-          ],
-        },
-      ],
       '/guide/': [
         {
           text: 'Guide',
           items: [
+            { text: 'Introduction', link: '/guide/introduction.md' },
+            { text: 'Installation', link: '/guide/installation.md' },
+            { text: 'Configuration', link: '/guide/configuration.md' },
+            { text: 'Entrypoints', link: '/guide/entrypoints.md' },
+            { text: 'Assets', link: '/guide/assets.md' },
+            { text: 'Multiple Browsers', link: '/guide/multiple-browsers.md' },
+            { text: 'Publishing', link: '/guide/publishing.md' },
             { text: 'Auto-imports', link: '/guide/auto-imports.md' },
             { text: 'Manifest.json', link: '/guide/manifest.md' },
             { text: 'Extension APIs', link: '/guide/extension-apis.md' },
             { text: 'Remote Code', link: '/guide/remote-code.md' },
+            { text: 'Development', link: '/guide/development.md' },
+            { text: 'Testing', link: '/guide/testing.md' },
             { text: 'Vite', link: '/guide/vite.md' },
+            { text: 'Compare', link: '/guide/compare.md' },
           ],
         },
+      ],
+      '/entrypoints/': [
         {
           text: 'Entrypoints',
           items: [
-            { text: 'Background', link: '/guide/background.md' },
-            { text: 'Bookmarks', link: '/guide/bookmarks.md' },
-            { text: 'Content Scripts', link: '/guide/content-scripts.md' },
-            { text: 'CSS', link: '/guide/css.md' },
-            { text: 'Devtools', link: '/guide/devtools.md' },
-            { text: 'History', link: '/guide/history.md' },
-            { text: 'Newtab', link: '/guide/newtab.md' },
-            { text: 'Options', link: '/guide/options.md' },
-            { text: 'Popup', link: '/guide/popup.md' },
-            { text: 'Sandbox', link: '/guide/sandbox.md' },
-            { text: 'Sidepanel', link: '/guide/sidepanel.md' },
-            { text: 'Unlisted Pages', link: '/guide/unlisted-pages.md' },
-            { text: 'Unlisted Scripts', link: '/guide/unlisted-scripts.md' },
+            { text: 'Background', link: '/entrypoints/background.md' },
+            { text: 'Bookmarks', link: '/entrypoints/bookmarks.md' },
+            {
+              text: 'Content Scripts',
+              link: '/entrypoints/content-scripts.md',
+            },
+            { text: 'CSS', link: '/entrypoints/css.md' },
+            { text: 'Devtools', link: '/entrypoints/devtools.md' },
+            { text: 'History', link: '/entrypoints/history.md' },
+            { text: 'Newtab', link: '/entrypoints/newtab.md' },
+            { text: 'Options', link: '/entrypoints/options.md' },
+            { text: 'Popup', link: '/entrypoints/popup.md' },
+            { text: 'Sandbox', link: '/entrypoints/sandbox.md' },
+            { text: 'Sidepanel', link: '/entrypoints/sidepanel.md' },
+            { text: 'Unlisted Pages', link: '/entrypoints/unlisted-pages.md' },
+            {
+              text: 'Unlisted Scripts',
+              link: '/entrypoints/unlisted-scripts.md',
+            },
+          ].sort((l, r) => l.text.localeCompare(r.text)),
+        },
+      ],
+      '/api/': [
+        {
+          items: [
+            { text: 'CLI', link: '/api/cli.md' },
+            { text: 'Config', link: '/api/config.md' },
+            { text: 'wxt', link: '/api/wxt.md' },
+            { text: 'wxt/browser', link: '/api/wxt-browser.md' },
+            { text: 'wxt/client', link: '/api/wxt-client.md' },
           ],
         },
       ],

docs/.vitepress/plugins/generate-cli-docs.ts

@@ -0,0 +1,108 @@
+import { relative, resolve } from 'node:path';
+import { readFileSync, writeFileSync } from 'node:fs';
+import { format } from 'prettier';
+import consola from 'consola';
+import { execaCommand } from 'execa';
+
+let hasGenerated = false;
+
+const cliDir = resolve('src/cli/commands');
+const cliDirGlob = resolve(cliDir, '**');
+const cliTemplatePath = resolve('docs/api/cli.tpl.md');
+const cliPath = resolve('docs/api/cli.md');
+
+const PREFACE = `<!--
+DO NOT EDIT
+Generated by \`wxt/docs/.vitepress/plugins/generate-config-docs.ts\`
+To make changes to the config reference, update the JSDoc in \`src/core/types/external.ts\`.
+-->`;
+
+export function generateCliDocs() {
+  writeFileSync(cliPath, '');
+
+  const generateDocs = async () => {
+    consola.info(`Generating ${relative(process.cwd(), cliPath)}`);
+    try {
+      const res = await execaCommand('pnpm -s wxt --help');
+      const dev = splitInfo(res.stdout);
+      const lines: Array<string | string[]> = [
+        `## \`wxt\``,
+        '```sh',
+        dev.rest,
+        '```',
+      ];
+
+      const commands = await Promise.all(
+        extractCommands(dev.info).map(async (command) => {
+          const res = await execaCommand(`pnpm -s wxt ${command} --help`);
+          const { rest: docs } = splitInfo(res.stdout);
+          return [`## \`wxt ${command}\``, '```sh', docs, '```'];
+        }),
+      );
+      lines.push(...commands);
+
+      const text = await format(
+        PREFACE +
+          '\n\n' +
+          readFileSync(cliTemplatePath, 'utf-8').replace(
+            '{{ DOCS }}',
+            lines.flat().join('\n'),
+          ),
+        { parser: 'markdown' },
+      );
+
+      writeFileSync(cliPath, text);
+      consola.success(`Generated ${relative(process.cwd(), cliPath)}`);
+    } catch (err) {
+      consola.fail(`Failed to generate ${relative(process.cwd(), cliPath)}`);
+      consola.error(err.message);
+    }
+  };
+
+  return {
+    name: 'docs:generate-cli-docs',
+    async config() {
+      if (!hasGenerated) {
+        hasGenerated = true;
+        await generateDocs();
+      }
+    },
+    configureServer(server: any) {
+      server.watcher.add(cliDirGlob);
+    },
+    async handleHotUpdate(ctx: { file: string }) {
+      if (ctx.file === cliTemplatePath || ctx.file.includes(cliDir)) {
+        await generateDocs();
+      }
+    },
+  };
+}
+
+function splitInfo(text: string): { info: string; rest: string } {
+  const infoStart = text.indexOf('For more info,');
+  const infoEnd = text.indexOf('\n\nOptions:');
+
+  if (infoStart === -1 || infoEnd === -1) {
+    return { info: '', rest: text };
+  }
+
+  const info = text.substring(infoStart, infoEnd).trim();
+  const rest = text.replace(info, '').trim().replace('\n\n\n\n', '\n\n');
+
+  return { info, rest };
+}
+
+function extractCommands(info: string): string[] {
+  const commands: string[] = [];
+
+  // Split the info by line and iterate through each line
+  info.split('\n').forEach((line) => {
+    // Use regex to capture the command after "$ wxt " and before "--help"
+    const match = line.match(/\$ wxt (\w+) --help/);
+    if (match && match[1]) {
+      commands.push(match[1]);
+    }
+  });
+
+  return commands;
+}

docs/.vitepress/plugins/generate-config-docs.ts

@@ -1,4 +1,4 @@
-import { resolve } from 'node:path';
+import { relative, resolve } from 'node:path';
 import { Project, ts, Type, Node, JSDocableNode } from 'ts-morph';
 import { readFileSync, writeFileSync } from 'node:fs';
 import { format } from 'prettier';
@@ -7,8 +7,8 @@ import consola from 'consola';
 let hasGenerated = false;
 
 const externalTypesPath = resolve('src/core/types/external.ts');
-const configTemplatePath = resolve('docs/config.tpl.md');
-const configPath = resolve('docs/config.md');
+const configTemplatePath = resolve('docs/api/config.tpl.md');
+const configPath = resolve('docs/api/config.md');
 
 const PREFACE = `<!--
 DO NOT EDIT
@@ -39,7 +39,7 @@ export function generateConfigDocs() {
   writeFileSync(configPath, '');
 
   const generateDocs = async () => {
-    consola.info('Generating /config.md');
+    consola.info(`Generating ${relative(process.cwd(), configPath)}`);
     try {
       const project = new Project({
         tsConfigFilePath: resolve('tsconfig.json'),
@@ -118,9 +118,9 @@ export function generateConfigDocs() {
       );
 
       writeFileSync(configPath, text);
-      consola.success('Generated /config.md');
+      consola.success(`Generated ${relative(process.cwd(), configPath)}`);
     } catch (err) {
-      consola.fail('Failed to generate /config.md');
+      consola.fail(`Failed to generate ${relative(process.cwd(), configPath)}`);
       consola.error(err.message);
     }
   };

docs/api.md

@@ -1,5 +0,0 @@
-# API Reference
-
-:::warning 🚧 Under construction
-This documentation does not exist yet.
-:::

docs/api/cli.tpl.md

@@ -0,0 +1,5 @@
+# CLI Reference
+
+> Reference generated from `wxt <command> --help`
+
+{{ DOCS }}

docs/api/config.tpl.md

@@ -0,0 +1,5 @@
+# Config Reference
+
+All the options you can use in your `wxt.config.ts` file.
+
+{{ DOCS }}

docs/api/wxt-browser.md

@@ -0,0 +1,10 @@
+# `wxt/browser` Reference
+
+:::warning 🚧 Under construction
+This documentation does not exist yet. All APIs are documented with JSDoc, so for now, you can view the documentation in your editor.
+
+```ts
+import { browser } from 'wxt/browser';
+```
+
+:::

docs/api/wxt-client.md

@@ -0,0 +1,14 @@
+# `wxt/client` Reference
+
+:::warning 🚧 Under construction
+This documentation does not exist yet. All APIs are documented with JSDoc, so for now, you can view the documentation in your editor.
+
+```ts
+import {
+  createContentScriptUi,
+  defineBackground,
+  defineContentScript,
+} from 'wxt/client';
+```
+
+:::

docs/api/wxt.md

@@ -0,0 +1,17 @@
+# `wxt` Reference
+
+:::warning 🚧 Under construction
+This documentation does not exist yet. All APIs are documented with JSDoc, so for now, you can view the documentation in your editor.
+
+```ts
+import {
+  build,
+  clean,
+  createServer,
+  defineConfig,
+  defineRunnerConfig,
+  version,
+} from 'wxt';
+```
+
+:::

docs/config.tpl.md

@@ -1,5 +0,0 @@
-# Config Reference
-
-Discover all the options you can use in your `wxt.config.ts` file.
-
-{{ DOCS }}

docs/entrypoints/background.md

@@ -8,8 +8,8 @@ For MV2, the background is added as a script to the background page. For MV3, th
 
 <EntrypointPatterns
   :patterns="[
-    ['background.ts', 'background.js'],
-    ['background/index.ts', 'background.js'],
+    ['background.[jt]s', 'background.js'],
+    ['background/index.[jt]s', 'background.js'],
   ]"
 />
 

docs/entrypoints/content-scripts.md

@@ -0,0 +1,292 @@
+# Content Scripts
+
+[Chrome Docs](https://developer.chrome.com/docs/extensions/mv3/content_scripts/) • [Firefox Docs](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_scripts)
+
+When creating content script entrypoints, they are automatically included in the `manifest.json` along with any CSS files they import.
+
+## Filenames
+
+<EntrypointPatterns
+  :patterns="[
+    ['content.[jt]sx?', 'content-scripts/content.js'],
+    ['content/index.[jt]sx?', 'content-scripts/content.js'],
+    ['<name>.content.[jt]sx?', 'content-scripts/<name>.js'],
+    ['<name>.content/index.[jt]sx?', 'content-scripts/<name>.js'],
+  ]"
+/>
+
+## Definition
+
+```ts
+export default defineContentScript({
+  // Set manifest options
+  matches: ['*://google.com/*', '*://duckduckgo.com/*'],
+  excludeMatches: undefined | [],
+  includeGlobs: undefined | [],
+  excludeGlobs: undefined | [],
+  allFrames: undefined | [],
+  runAt: undefined | 'document_start' | 'document_end' | 'document_idle',
+  matchAboutBlank: undefined | true | false,
+  matchOriginAsFallback: undefined | true | false,
+  world: undefined | 'ISOLATED' | 'MAIN',
+
+  // Set include/exclude if the background should be removed from some builds
+  include: undefined | string[],
+  exclude: undefined | string[],
+
+  // Configure how CSS is injected onto the page
+  cssInjectionMode: undefined | "manifest" | "manual" | "ui",
+
+  main(ctx) {
+    // Executed when content script is loaded
+  },
+});
+```
+
+> All manifest options default to `undefined`.
+
+When defining multiple content scripts, content script entrypoints that have the same set of options will be merged into a single `content_script` item in the manifest.
+
+## Context
+
+Old content scripts are not automatically stopped when an extension updates and reloads. Often, this leads to "Invalidated context" errors in production when a content script from an old version of your extension tries to use a extension API.
+
+WXT provides a utility for managing this process: `ContentScriptContext`. An instance of this class is provided to you automatically inside the `main` function of your content script.
+
+```ts
+export default defineContentScript({
+  // ...
+  main(ctx: ContentScriptContext) {
+    // Add custom listeners for stopping work
+    ctx.onInvalidated(() => {
+      // ...
+    });
+
+    // Stop fetch requests
+    fetch('...url', { signal: ctx.signal });
+
+    // Timeout utilities
+    ctx.setTimeout(() => {
+      // ...
+    }, 5e3);
+    ctx.setInterval(() => {
+      // ...
+    }, 60e3);
+  },
+});
+```
+
+The class extends [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController) and provides other utilities for stopping a content script's logic once it becomes invalidated.
+
+:::tip
+When working with content scripts, **you should always use the `ctx` object to stop any async or future work.**
+
+This prevents old content scripts from interfering with new content scripts, and prevents error messages from the console in production.
+:::
+
+## CSS
+
+To include CSS with your content script, import the CSS file at the top of your entrypoint.
+
+```
+
+<srcDir>
+└─ entrypoints/
+   └─ overlay.content/
+      ├─ index.ts
+      └─ style.css
+```
+
+```ts
+// entrypoints/overlay.content/index.ts
+import './style.css';
+
+export default defineContentScript({
+  matches: ['*://google.com/*', '*://duckduckgo.com/*'],
+
+  main(ctx) {
+    // ...
+  },
+});
+```
+
+Any styles imported in your content script will be added to that content script's `css` array in your `manifest.json`:
+
+```json
+// .output/chrome-mv3/manifest.json
+{
+  "content_scripts": [
+    {
+      "matches": ["*://google.com/*", "*://duckduckgo.com/*"],
+      "js": ["content-scripts/overlay.js"],
+      "css": ["content-scripts/overlay.css"]
+    }
+  ]
+}
+```
+
+To disable this behavior, set `cssInjectionMode` to `"manual"` or `"ui"`.
+
+```ts
+export default defineContentScript({
+  matches: ['*://google.com/*', '*://duckduckgo.com/*'],
+  cssInjectionMode: 'manual',
+
+  main(ctx) {
+    // ...
+  },
+});
+```
+
+## UI
+
+WXT provides a utility function, `createContentScriptUi` to simplify mounting a UI from a content script. Internally, it uses the `ShadowRoot` API to isolate your CSS from the webpages.
+
+`createContentScriptUi` requires a `ContentScriptContext` so that when the context is invalidated, the UI is automatically removed from the webpage.
+
+:::details When to use `createContentScriptUi`
+You should only use `createContentScriptUi` if you want your UI's styles isolated from the webpages. If you want to create a more "integrated" UI that uses the page's styles, you can just use the regular JS API's to append your UI to the page.
+
+```ts
+const ui = document.createElement('div');
+const anchor = document.querySelector('#anchor-selector');
+anchor.append(ui);
+```
+
+:::
+
+### Usage
+
+To use `createContentScriptUi`, follow these steps:
+
+1. Import your CSS file at the top of your content script
+2. Set `cssInjectionMode: "ui"` inside `defineContentScript`
+3. Call `createContentScriptUi`
+4. Call `ui.mount()` to add the UI to the webpage
+
+Here's a basic example:
+
+```ts
+// entrypoints/ui.content/index.ts
+import './style.css';
+
+export default defineContentScript({
+  // ...
+  cssInjectionMode: 'ui',
+
+  async main(ctx) {
+    const ui = await createContentScriptUi(ctx, {
+      name: 'example-ui',
+      type: 'inline',
+      anchor: '#some-element',
+      append: 'after',
+      mount(container) {
+        // Mount UI inside `container`...
+      },
+    });
+
+    // Yoy must call `mount` to add the UI to the page.
+    ui.mount();
+  },
+});
+```
+
+If you're using a frontend framework, you'll also need to include an `onRemoved` callback:
+
+:::code-group
+
+```ts [Vue]
+import { createApp } from 'vue';
+
+createContentScriptUi(ctx, {
+  // ...
+  mount(container) {
+    // Create a new app and mount it inside the container
+    const app = createApp(...);
+    app.mount(container);
+    return app;
+  },
+  onRemove(app) {
+    // When the UI is removed from the DOM, call unmount to stop the app
+    app.unmount();
+  },
+});
+```
+
+```ts [React]
+import ReactDOM from 'react-dom/client';
+
+createContentScriptUi(ctx, {
+  // ...
+  mount(container) {
+    // Create a root using the container and render your app
+    const root = ReactDOM.createRoot(container);
+    root.render(...);
+    return root;
+  },
+  onRemove(root) {
+    // When the UI is removed from the DOM, call unmount to stop the app
+    root.unmount();
+  },
+});
+```
+
+```ts [Svelte]
+import App from './App.svelte';
+
+createContentScriptUi(ctx, {
+  // ...
+  mount(container) {
+    // Mount your app component inside the container
+    return new App({
+      target: container,
+    });
+  },
+  onRemove(app) {
+    // When the UI is removed from the DOM, call $destroy to stop the app
+    app.$destroy();
+  },
+});
+```
+
+```ts [Solid]
+import { render } from 'solid-js/web';
+
+createContentScriptUi(ctx, {
+  // ...
+  mount(container) {
+    // Render your app component into the container
+    return render(() => ..., container)
+  },
+  onRemove(unmount) {
+    // When the UI is removed from the DOM, call unmount to stop the app
+    unmount();
+  },
+});
+```
+
+:::
+
+### `anchor`
+
+The anchor dictates where the UI will be mounted.
+
+### `append`
+
+Customize where the UI get's appended to the DOM, relative to the `anchor` element.
+
+### `type`
+
+There are 3 types of UI's you can mount.
+
+- `inline`: Shows up inline based on the `anchor` and `append` options
+- `overlay`: Shows up inline, but styled to be 0px by 0px, with overflow visible. This causes the UI to overlay on top of the webpage's content
+- `modal`: A fullscreen overlay that covers the entire screen, regardless of where it's anchored.
+
+> TODO: Add visualization of the different UI types.
+
+### Overlay `alignment`
+
+Because the overlay UI type results in a 0px by 0px container being added to the webpage, the `alignment` option allows you to configure which corner of your UI is aligned with the 0x0 element.
+
+> TODO: Add visualization of the different alignments.

docs/entrypoints/css.md

@@ -2,10 +2,10 @@
 
 WXT can build CSS entrypoints individually. CSS entrypoints are always unlisted.
 
-See [Content Script CSS](/guide/content-scripts.md#css) documentation for the recomended approach to include CSS with a content script.
+See [Content Script CSS](/entrypoints/content-scripts#css) documentation for the recomended approach to include CSS with a content script.
 
 :::info
-If the recommended approach doesn't work for your use case, you can use any of the filename patterns below to build the styles separate from the JS and use the [`transformManifest` hook](/config.md#transformmanifest) to manually add your CSS file to the manifest.
+If the recommended approach doesn't work for your use case, you can use any of the filename patterns below to build the styles separate from the JS and use the [`transformManifest` hook](/api/config#transformmanifest) to manually add your CSS file to the manifest.
 :::
 
 ## Filenames

docs/entrypoints/unlisted-scripts.md

@@ -6,8 +6,8 @@ TypeScript files that are built, but are not included in the manifest.
 
 <EntrypointPatterns
   :patterns="[
-    ['<name>.(ts|tsx)', '<name>.js'],
-    ['<name>/index.(ts|tsx)', '<name>.js'],
+    ['<name>.[jt]sx?', '<name>.js'],
+    ['<name>/index.[jt]sx?', '<name>.js'],
   ]"
 />
 

docs/get-started/build-targets.md

@@ -1,46 +0,0 @@
-# Build Targets
-
-You can build an extension for any combination of browser and manifest verison. Different browsers and manifest versions support different APIs and entrypoints, so be sure to check that your extension functions as expected for each target.
-
-Separate build targets are written to their own output directories:
-
-```
-<rootDir>
-└─ .output
-   ├─ chrome-mv3
-   ├─ firefox-mv2
-   ├─ edge-mv3
-   └─ ...
-```
-
-## Target Browser
-
-To build for a specific browser, pass the `-b --browser` flag from the CLI:
-
-```
-
-wxt --browser firefox
-wxt build --browser firefox
-
-```
-
-By default, it will build for `chrome`. When excluding the [`--mv2` or `--mv3` flags](#target-manifest-version), it will default to the commonly accepted manifest version used with that browser.
-
-| Browser          | Default Manifest Version |
-| ---------------- | :----------------------: |
-| `chrome`         |            3             |
-| `firefox`        |            2             |
-| `safari`         |            2             |
-| `edge`           |            3             |
-| Any other string |            3             |
-
-## Target Manifest Version
-
-To build for a specific manifest version, pass either the `--mv2` flag or `--mv3` flag from the CLI.
-
-```sh
-wxt --mv2
-wxt build --mv2
-```
-
-When the `-b --browser` flag is not passed, it defaults to `chrome`. So here, we're targetting MV2 for Chrome.

docs/get-started/testing.md

@@ -1,5 +0,0 @@
-# Testing
-
-:::warning 🚧 Testing utils are not implemented yet!
-Eventually, the plan is to have an integration with Vitest.
-:::

docs/guide/auto-imports.md

@@ -3,18 +3,19 @@
 WXT uses the same tool as Nuxt for auto-imports, [`unimport`](https://github.com/unjs/unimport).
 
 :::info Testing
-To setup your test environment for auto-imports, see [Testing](/get-started/testing.md).
+To setup your test environment for auto-imports, see [Testing](/guide/testing).
 :::
 
 ## WXT Auto-imports
 
 Some WXT APIs can be used without importing them:
 
-- [`browser`](/config.md#browser) from `wxt/browser`, a small wrapper around `webextension-polyfill`
-- [`defineContentScript`](/config.md#defiencontentscript) from `wxt/client`
-- [`defineBackground`](/config.md#definebackgroundscript) from `wxt/client`
+- [`browser`](/api/wxt-browser#browser) from `wxt/browser`, a small wrapper around `webextension-polyfill`
+- [`defineContentScript`](/api/wxt-client#defiencontentscript) from `wxt/client`
+- [`defineBackground`](/api/wxt-client#definebackgroundscript) from `wxt/client`
+- [`createContentScriptUi`](/api/wxt-client#createcontentscriptui) from `wxt/client`
 
-And more. All [`wxt/client`](/config.md#wxtclient) APIs can be used without imports.
+And more. All [`wxt/client`](/api/wxt-client) APIs can be used without imports.
 
 ## Project Auto-imports
 

docs/guide/configuration.md

@@ -15,7 +15,7 @@ export default defineConfig({
 ```
 
 :::info
-See the [Config reference](/config.md) for a full list of options.
+See the [Config reference](/api/config) for a full list of options.
 :::
 
 ## Directory Config
@@ -25,7 +25,7 @@ WXT allows you to edit several directories to your liking:
 - `root` (default: `process.cwd()`) - Root of the WXT project
 - `srcDir` (default: `<rootDir>`) - Location of all your source code
 - `entrypointsDir` (default: `<srcDir>/entrypoints`) - Folder containing all the entrypoints.
-- `publicDir` (default: `<srcDir>/public`) - Folder containing [public assets](/get-started/assets.md)
+- `publicDir` (default: `<srcDir>/public`) - Folder containing [public assets](/guide/assets)
 
 ### Example
 

docs/guide/content-scripts.md

@@ -1,122 +0,0 @@
-# Content Scripts
-
-[Chrome Docs](https://developer.chrome.com/docs/extensions/mv3/content_scripts/) • [Firefox Docs](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_scripts)
-
-When creating content script entrypoints, they are automatically included in the `manifest.json` along with any CSS files they import.
-
-## Filenames
-
-<EntrypointPatterns
-  :patterns="[
-    ['content.(ts|tsx)', 'content-scripts/content.js'],
-    ['content/index.(ts|tsx)', 'content-scripts/content.js'],
-    ['<name>.content.(ts|tsx)', 'content-scripts/<name>.js'],
-    ['<name>.content/index.(ts|tsx)', 'content-scripts/<name>.js'],
-  ]"
-/>
-
-## Definition
-
-```ts
-export default defineContentScript({
-  // Set manifest options
-  matches: ['*://google.com/*', '*://duckduckgo.com/*'],
-  excludeMatches: undefined | [],
-  includeGlobs: undefined | [],
-  excludeGlobs: undefined | [],
-  allFrames: undefined | [],
-  runAt: undefined | 'document_start' | 'document_end' | 'document_idle',
-  matchAboutBlank: undefined | true | false,
-  matchOriginAsFallback: undefined | true | false,
-  world: undefined | 'ISOLATED' | 'MAIN',
-
-  // Set include/exclude if the background should be removed from some builds
-  include: undefined | string[],
-  exclude: undefined | string[],
-
-  main(ctx) {
-    // Executed when content script is loaded
-  },
-});
-```
-
-> All manifest options default to `undefined`.
-
-When defining multiple content scripts, content script entrypoints that have the same set of options will be merged into a single `content_script` item in the manifest.
-
-## CSS
-
-To include CSS with your content script, import the CSS file at the top of your entrypoint.
-
-```
-
-<srcDir>
-└─ entrypoints/
-   └─ overlay.content/
-      ├─ index.ts
-      └─ style.css
-```
-
-```ts
-// entrypoints/overlay.content/index.ts
-import './style.css';
-
-export default defineContentScript({
-  matches: ['*://google.com/*', '*://duckduckgo.com/*'],
-  main(ctx) {
-    // ...
-  },
-});
-```
-
-Any styles imported in your content script will be added to that content script's `css` array in your `manifest.json`:
-
-```json
-// .output/chrome-mv3/manifest.json
-{
-  "content_scripts": [
-    {
-      "matches": ["*://google.com/*", "*://duckduckgo.com/*"],
-      "js": ["content-scripts/overlay.js"],
-      "css": ["content-scripts/overlay.css"]
-    }
-  ]
-}
-```
-
-## Context
-
-Old content scripts are not automatically stopped when an extension updates and restarts. Often, this leads to "Invalidated context" errors in production when a content script from an old version of your extension tries to use a web extension API. Since it's not connected to the latest version of your extension, the browser decides to throw an error.
-
-WXT provides a utility for managing this process: `ContentScriptContext`. An instance of this class is provided to you automatically inside the `main` function of your content script.
-
-```ts
-export default defineContentScript({
-  // ...
-  main(ctx: ContentScriptContext) {
-    // Add custom listeners for stopping work
-    ctx.onInvalidated(() => {
-      // ...
-    });
-
-    // Stop fetch requests
-    fetch('...url', { signal: ctx.signal });
-
-    // Timeout utilities
-    ctx.setTimeout(() => {
-      // ...
-    }, 5e3);
-    ctx.setInterval(() => {
-      // ...
-    }, 60e3);
-  },
-});
-```
-
-The class extends [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController) and provides other utilities for stopping a content script's logic once it becomes invalidated.
-
-:::tip
-When working with content scripts, **you should always use the `ctx` object to stop any async or future work.**
-
-This prevents old content scripts from interfering with new content scripts, and prevents error messages from the console in production.
-:::

docs/guide/development.md

@@ -0,0 +1,53 @@
+# Development
+
+WXT's main goal is providing the best DX it possibly can. When running your extension in dev mode, each part of your extension is reloaded separately when possible.
+
+|                     | HMR | Reloaded individually | Reload extension |                    Restart browser                     |
+| ------------------- | :-: | :-------------------: | :--------------: | :----------------------------------------------------: |
+| HTML File           |     |          ✅           |
+| HTML Dependency     | ✅  |
+| MV3 Content Script  |     |          ✅           |
+| MV2 Content Script  |     |                       |        ✅        |
+| Background          |     |                       |        ✅        |
+| manifest.json       |     |                       |                  | 🟡 See [#16](https://github.com/wxt-dev/wxt/issues/16) |
+| `wxt.config.ts`     |     |                       |                  | 🟡 See [#10](https://github.com/wxt-dev/wxt/issues/10) |
+| `web-ext.config.ts` |     |                       |                  | 🟡 See [#10](https://github.com/wxt-dev/wxt/issues/10) |
+
+## Configure Browser Startup
+
+WXT uses [`web-ext` by Mozilla](https://github.com/mozilla/web-ext) to automatically open a browser with the extension installed. You can configure the runner's behavior via the [`runner`](/api/config#runner.disabled) option, or in a separate gitignored file, `web-ext.config.ts`.
+
+:::code-group
+
+```ts [wxt.config.ts]
+import { defineConfig } from 'wxt';
+
+export default defineConfig({
+  runner: {
+    // Runner config
+  },
+});
+```
+
+```ts [web-ext.config.ts]
+import { defineRunnerConfig } from 'wxt';
+
+export default defineRunnerConfig({
+  // Runner config
+});
+```
+
+:::
+
+You may also setup default for your entire computer by creating a `web-ext.config.ts` file in your home directory. This is useful if you want to specify config for all project on your computer, like that you want to use Chrome Beta instead of Chrome.
+
+```ts
+// ~/web-ext.config.ts
+import { defineRunnerConfig } from 'wxt';
+
+export default defineRunnerConfig({
+  binaries: {
+    chrome: '/path/to/chrome-beta',
+  },
+});
+```

docs/guide/entrypoints.md

@@ -42,7 +42,7 @@ would result in the following `manifest.json`:
 }
 ```
 
-If a file uses a [special name recognized by WXT](/get-started/entrypoints.md), it will be added to the manifest. In this case:
+If a file uses a special name recognized by WXT, it will be added to the manifest. In this case:
 
 - `popup.html` → `action.default_popup`
 - `content.ts` → `content_scripts.0.js.0`
@@ -53,7 +53,7 @@ But not all entrypoints are added to the `manifest.json`. If the filename is not
 In this case, `injected.ts` gets output to `<outdir>/injected.js` and is accessible via `browser.runtime.getURL("/injected.js")`.
 
 :::info
-See [`/entrypoints` folder](/guide/background.md) documentation for a full list of recognized entrypoint filenames.
+See [`/entrypoints` folder](/entrypoints/background) documentation for a full list of recognized entrypoint filenames.
 :::
 
 ## Entrypoint Options
@@ -84,5 +84,5 @@ export default defineContentScript({
 ```
 
 :::info
-For a full list of entrypoints and each of their options, see the [`/entrypoints` folder](/guide/background.md) documentation.
+For a full list of entrypoints and each of their options, see the [`/entrypoints` folder](/entrypoints/background) documentation.
 :::

docs/guide/extension-apis.md

@@ -11,7 +11,7 @@ And that's it! Your extension now supports Chrome, Firefox, Safari, Edge, and ot
 
 ## Basic Usage
 
-The `browser` variable is available globally via [auto-imports](/guide/auto-imports.md), or it can be imported manually.
+The `browser` variable is available globally via [auto-imports](/guide/auto-imports), or it can be imported manually.
 
 ```ts
 import { browser } from 'wxt/browser';

docs/guide/installation.md

@@ -26,7 +26,9 @@ There are several starting templates available.
 | <Icon name="Svelte" /> [`svelte`](https://github.com/wxt-dev/wxt/tree/main/templates/svelte)                                                            |
 | <Icon name="Solid" icon="https://www.solidjs.com/img/favicons/favicon-32x32.png" /> [`solid`](https://github.com/wxt-dev/wxt/tree/main/templates/solid) |
 
-> All templates are in TypeScript. WXT does not support JS at this time.
+:::info
+All templates default to TypeScript. Rename the file extensions to `.js` to use JavaScript instead.
+:::
 
 ## From Scratch
 
@@ -142,6 +144,6 @@ If you're an experienced web extension developer and think the dev manifest look
 
 You're ready to build your web extension!
 
-- Learn how to [add entrypoints](./entrypoints.md) like the popup, options page, or content scripts
-- [Configure WXT](./configuration.md) by creating a `wxt.config.ts` file
+- Learn how to [add entrypoints](./entrypoints) like the popup, options page, or content scripts
+- [Configure WXT](./configuration) by creating a `wxt.config.ts` file
 - Checkout [example projects](https://github.com/wxt-dev/wxt-examples) to see how to perfom common tasks with WXT

docs/guide/introduction.md

@@ -35,5 +35,5 @@ Production builds are optimized for store review, changing as few files as possi
 In addition, WXT fully supports Firefox's source code requirements when using a bundler. It will automatically create and upload a ZIP file of your source code.
 
 :::info
-See [Publishing](./publishing.md) for more info around production builds.
+See [Publishing](./publishing) for more info around production builds.
 :::

docs/guide/manifest.md

@@ -49,7 +49,7 @@ The [manifest's `version` and `version_name`](https://developer.chrome.com/docs/
 
 ## `icons`
 
-By default, WXT will discover icons in your [`public` directory](/get-started/assets#public-directory) and use them for the [manifest's `icons`](https://developer.chrome.com/docs/extensions/mv3/manifest/icons/).
+By default, WXT will discover icons in your [`public` directory](/guide/assets#public-directory) and use them for the [manifest's `icons`](https://developer.chrome.com/docs/extensions/mv3/manifest/icons/).
 
 ```
 public/
@@ -94,7 +94,7 @@ export default defineConfig({
 
 ## Localization
 
-Similar to the icon, the [`_locales` directory](https://developer.chrome.com/docs/extensions/reference/i18n/) should be placed inside the the WXT's [`public` directory](/get-started/assets#public-directory).
+Similar to the icon, the [`_locales` directory](https://developer.chrome.com/docs/extensions/reference/i18n/) should be placed inside the the WXT's [`public` directory](/guide/assets#public-directory).
 
 ```
 public/

docs/guide/multiple-browsers.md

@@ -0,0 +1,110 @@
+# Multiple Browsers
+
+You can build an extension for any combination of browser and manifest verison. Different browsers and manifest versions support different APIs and entrypoints, so be sure to check that your extension functions as expected for each target.
+
+Separate build targets are written to their own output directories:
+
+```
+<rootDir>
+└─ .output
+   ├─ chrome-mv3
+   ├─ firefox-mv2
+   ├─ edge-mv3
+   └─ ...
+```
+
+## Target Browser
+
+To build for a specific browser, pass the `-b --browser` flag from the CLI:
+
+```
+
+wxt --browser firefox
+wxt build --browser firefox
+
+```
+
+By default, it will build for `chrome`. When excluding the [`--mv2` or `--mv3` flags](#target-manifest-version), it will default to the commonly accepted manifest version used with that browser.
+
+| Browser          | Default Manifest Version |
+| ---------------- | :----------------------: |
+| `chrome`         |            3             |
+| `firefox`        |            2             |
+| `safari`         |            2             |
+| `edge`           |            3             |
+| Any other string |            3             |
+
+## Target Manifest Version
+
+To build for a specific manifest version, pass either the `--mv2` flag or `--mv3` flag from the CLI.
+
+```sh
+wxt --mv2
+wxt build --mv2
+```
+
+When the `-b --browser` flag is not passed, it defaults to `chrome`. So here, we're targetting MV2 for Chrome.
+
+## Customizing Entrypoints
+
+There are several ways to customize entrypoint definitions per browser.
+
+First, you can use either the `include` or `exclude` option to include or exclude the entrypoint from specific browsers. Here are some examples
+
+:::code-group
+
+```ts [Background]
+export default defineBackground({
+  // Only include a background script when targeting chrome
+  include: ['chrome'],
+});
+```
+
+```ts [Content Script]
+export default defineContentScript({
+  // Do not add this content script to the manifest when targeting firefox
+  exclude: ['firefox'],
+});
+```
+
+```html [HTML page]
+<!-- entrypoints/options.html -->
+<html>
+  <head>
+    <!-- Don't include the options page for safari -->
+    <meta name="manifest.exclude" content="['safari']" />
+  </head>
+</html>
+```
+
+:::
+
+Second, you can change individual options per-browser:
+
+:::code-group
+
+```ts [Background]
+export default defineBackground({
+  persistent: {
+    // Use a non-persistent background script for just safari
+    safari: false,
+  },
+});
+```
+
+```ts [Content Script]
+export default defineContentScript({
+  matches: {
+    // Run the content script on different pages for each browser
+    chrome: ['*://*.google.com/*'],
+    firefox: ['*://*.duckduckgo.com/*'],
+    edge: ['*://*.bing.com/*'],
+  },
+});
+```
+
+:::
+
+:::warning
+Only `defineBackground` and `defineContentScript` support per-browser options right now.
+:::

docs/guide/testing.md

@@ -0,0 +1,92 @@
+# Testing
+
+WXT provides a couple of utils for unit testing your extension.
+
+[[toc]]
+
+## Fake Browser
+
+The `wxt/fake-browser` package includes an in-memory implementation of the `browser` variable you can use for testing. WXT simply re-exports the `fakeBrowser` variable from [`@webext-core/fake-browser`](https://webext-core.aklinker1.io/guide/fake-browser/).
+
+Here's an example test using Vitest:
+
+```ts
+import { describe, it, expect, vi } from 'vitest';
+import { browser } from 'wxt/browser';
+import { fakeBrowser } from 'wxt';
+
+// Function we're testing
+function onHelloMessage(cb: () => void) {
+  browser.runtime.onMessage.addEventListener((message) => {
+    if (message.type === 'hello') return 'world';
+  });
+}
+
+// Mock the real `browser` object with a fake one
+vi.mock('wxt/browser', () => import('wxt/fake-browser'));
+
+describe('onHelloMessage', () => {
+  it("should call the callback when the message type is 'hello'", () => {
+    const cb = vi.fn();
+    const expected = 'world';
+
+    onHelloMessage(cb);
+    const actual = await fakeBrowser.runtime.sendMessage({ type: 'hello' });
+
+    expect(cb).toBeCalledTimes(1);
+    expect(actual).toBe(expected);
+  });
+
+  it("should ignore the message when the message type is not 'hello'", () => {
+    const cb = vi.fn();
+
+    onHelloMessage(cb);
+    await fakeBrowser.runtime.sendMessage({ type: 'not-hello' }).catch();
+
+    expect(cb).not.toBeCalled();
+  });
+});
+```
+
+See [`@webext-core/fake-browser`](https://webext-core.aklinker1.io/guide/fake-browser/) for setup, implemented APIs, and example tests.
+
+## Handling Auto-imports
+
+By default, WXT uses auto-imports. For tests, this can cause issues if your test environment is not setup to handle them correctly.
+
+:::warning 🚧 Testing utils are not implemented yet!
+Eventually, WXT will provide utilities for setting up these auto-imports. For now, you'll need to set them up manually.
+:::
+
+Not all testing frameworks can handle auto-imports. If your framework or setup is not listed below, it may be easiest to disable auto-imports.
+
+To setup auto-imports manually, use [`unplugin-auto-import`](https://www.npmjs.com/package/unplugin-auto-import). It uses the same tool, `unimport`, as WXT and will result in compatiple auto-imports. `unplugin-auto-import` supports lots of different tools (vite, webpage, esbuild, rollup, etc). You can try and integrate it into your build process.
+
+### Vitest (Recommended)
+
+Vitest is easy, simply add `uplugin-auto-import` to your project.
+
+```ts
+// vitest.config.ts
+import autoImports from 'unplugin-auto-import/vite';
+
+export default defineConfig({
+  plugins: [
+    autoImports({
+      imports: [{ name: 'defineConfig', from: 'wxt' }],
+      presets: [{ package: 'wxt/client' }, { package: 'wxt/browser' }],
+      dirs: ['components', 'composables', 'hooks', 'utils'],
+    }),
+  ],
+});
+```
+
+### Jest
+
+Don't use jest and auto-imports. You could try and configure jest to be transpiled by one of `unplugin-auto-import`'s supported built tools, but I don't know of a way to configure this. See [unplugin/unplugin-auto-import#33](https://github.com/unplugin/unplugin-auto-import/issues/33) if you want to try and set it up.
+
+I would recommend disabling auto-imports or migrating to Vitest if you want to use auto-imports.
+
+### Mocha
+
+TODO: Is this possible? Maybe with `esbuild-mocha`? I would recommend moving to Vitest.

docs/index.md

@@ -13,31 +13,31 @@ hero:
   actions:
     - theme: brand
       text: Get Started
-      link: /get-started/installation
+      link: /guide/installation
     - theme: alt
       text: Learn More
-      link: /get-started/introduction
+      link: /guide/introduction
 
 features:
   - icon: 🌐
     title: Supported Browsers
     details: WXT will build extensions for Chrome, Firefox, Edge, Safari, and any Chromium based browser.
-    link: /get-started/build-targets
+    link: /guide/multiple-browsers
     linkText: Read docs
   - icon: ✅
     title: MV2 and MV3
     details: Build Manifest V2 or V3 extensions for any browser using the same codebase.
-    link: /get-started/build-targets#target-manifest-version
+    link: /guide/multiple-browsers#target-manifest-version
     linkText: Read docs
   - icon: ⚡
     title: Fast Dev Mode
     details: Lighting fast HMR for UI development and fast reloads for content/background scripts enables faster iterations.
-    link: /get-started/introduction.html#development
+    link: /guide/development.html
     linkText: Learn more
   - icon: 📂
     title: File Based Entrypoints
     details: Manifest is generated based on files in the project with inline configuration.
-    link: /get-started/entrypoints
+    link: /guide/entrypoints
     linkText: See project structure
   - icon: 🚔
     title: TypeScript
@@ -50,17 +50,17 @@ features:
   - icon: ⬇️
     title: Bundle Remote Code
     details: Downloads and bundles remote code imported from URLs.
-    link: guide/remote-code
+    link: /guide/remote-code
     linkText: Read docs
   - icon: 🎨
     title: Frontend Framework Agnostic
     details: Works with any front-end framework with a Vite plugin.
-    link: /get-started/configuration#frontend-frameworks
+    link: /guide/configuration#frontend-frameworks
     linkText: Add a framework
   - icon: 🖍️
     title: Bootstrap a New Project
     details: Get started quickly with several awesome project templates.
-    link: /get-started/installation#bootstrap-project
+    link: /guide/installation#bootstrap-project
     linkText: See templates
   - icon: 📏
     title: Bundle Analysis

docs/public/_redirects

@@ -0,0 +1,30 @@
+# Netlify Redirects File
+# https://docs.netlify.com/routing/redirects/
+
+# Old URLs -> New URLs
+/config.html                    /api/config.html
+/entrypoints                    /entrypoints/background.html
+/get-started/assets.html        /guide/assets.html
+/get-started/build-targets.html /guide/multiple-browsers.html
+/get-started/compare.html       /guide/compare.html
+/get-started/configuration.html /guide/configuration.html
+/get-started/entrypoints.html   /guide/entrypoints.html
+/get-started/installation.html  /guide/installation.html
+/get-started/introduction.html  /guide/introduction.html
+/get-started/publishing.html    /guide/publishing.html
+/get-started/testing.html       /guide/testing.html
+/guide/background.html          /entrypoints/background.html
+/guide/bookmarks.html           /entrypoints/bookmarks.html
+/guide/content-scripts.html     /entrypoints/content-scripts.html
+/guide/css.html                 /entrypoints/css.html
+/guide/devtools.html            /entrypoints/devtools.html
+/guide/history.html             /entrypoints/history.html
+/guide/manifest.html            /entrypoints/manifest.html
+/guide/newtab.html              /entrypoints/newtab.html
+/guide/options.html             /entrypoints/options.html
+/guide/popup.html               /entrypoints/popup.html
+/guide/sandbox.html             /entrypoints/sandbox.html
+/guide/sidepanel.html           /entrypoints/sidepanel.html
+/guide/unlisted-pages.html      /entrypoints/unlisted-pages.html
+/guide/unlisted-scripts.html    /entrypoints/unlisted-scripts.html
+/guide/build-targets.html       /guide/multiple-browsers.html

e2e/tests/auto-imports.test.ts

@@ -18,10 +18,10 @@ describe('Auto Imports', () => {
           declare global {
             const ContentScriptContext: typeof import('wxt/client')['ContentScriptContext']
             const browser: typeof import('wxt/browser')['browser']
+            const createContentScriptUi: typeof import('wxt/client')['createContentScriptUi']
             const defineBackground: typeof import('wxt/client')['defineBackground']
             const defineConfig: typeof import('wxt')['defineConfig']
             const defineContentScript: typeof import('wxt/client')['defineContentScript']
-            const mountContentScriptUi: typeof import('wxt/client')['mountContentScriptUi']
           }
           "
         `);

e2e/tests/manifest-content.test.ts

@@ -193,118 +193,295 @@ describe('Manifest Content', () => {
     });
   });
 
-  it('should group content scripts and styles together based on their matches and run_at', async () => {
-    const project = new TestProject();
-    project.addFile(
-      'entrypoints/one.content/index.ts',
-      `import "./style.css";
+  describe('content_scripts', () => {
+    it('should group content scripts and styles together based on their matches and run_at', async () => {
+      const project = new TestProject();
+      project.addFile(
+        'entrypoints/one.content/index.ts',
+        `import "./style.css";
       export default defineContentScript({
         matches: ["*://google.com/*"],
         main: () => {},
       })`,
-    );
-    project.addFile('entrypoints/one.content/style.css', `body { color: red }`);
-    project.addFile(
-      'entrypoints/two.content/index.ts',
-      `import "./style.css";
+      );
+      project.addFile(
+        'entrypoints/one.content/style.css',
+        `body { color: red }`,
+      );
+      project.addFile(
+        'entrypoints/two.content/index.ts',
+        `import "./style.css";
       export default defineContentScript({
         matches: ["*://google.com/*"],
         runAt: "document_end",
         main: () => {},
       })`,
-    );
-    project.addFile(
-      'entrypoints/two.content/style.css',
-      `body { color: green }`,
-    );
-    project.addFile(
-      'entrypoints/three.content/index.ts',
-      `import "./style.css";
+      );
+      project.addFile(
+        'entrypoints/two.content/style.css',
+        `body { color: green }`,
+      );
+      project.addFile(
+        'entrypoints/three.content/index.ts',
+        `import "./style.css";
       export default defineContentScript({
         matches: ["*://google.com/*"],
         runAt: "document_end",
         main: () => {},
       })`,
-    );
-    project.addFile(
-      'entrypoints/three.content/style.css',
-      `body { color: blue }`,
-    );
-    project.addFile(
-      'entrypoints/four.content/index.ts',
-      `import "./style.css";
+      );
+      project.addFile(
+        'entrypoints/three.content/style.css',
+        `body { color: blue }`,
+      );
+      project.addFile(
+        'entrypoints/four.content/index.ts',
+        `import "./style.css";
       export default defineContentScript({
         matches: ["*://duckduckgo.com/*"],
         runAt: "document_end",
         main: () => {},
       })`,
-    );
-    project.addFile(
-      'entrypoints/four.content/style.css',
-      `body { color: yellow }`,
-    );
+      );
+      project.addFile(
+        'entrypoints/four.content/style.css',
+        `body { color: yellow }`,
+      );
 
-    await project.build();
+      await project.build();
 
-    const manifest = await project.getOutputManifest();
+      const manifest = await project.getOutputManifest();
 
-    expect(manifest.content_scripts).toContainEqual({
-      matches: ['*://duckduckgo.com/*'],
-      run_at: 'document_end',
-      css: ['assets/four.css'],
-      js: ['content-scripts/four.js'],
+      expect(manifest.content_scripts).toContainEqual({
+        matches: ['*://duckduckgo.com/*'],
+        run_at: 'document_end',
+        css: ['content-scripts/four.css'],
+        js: ['content-scripts/four.js'],
+      });
+      expect(manifest.content_scripts).toContainEqual({
+        matches: ['*://google.com/*'],
+        run_at: 'document_end',
+        css: ['content-scripts/three.css', 'content-scripts/two.css'],
+        js: ['content-scripts/three.js', 'content-scripts/two.js'],
+      });
+      expect(manifest.content_scripts).toContainEqual({
+        matches: ['*://google.com/*'],
+        css: ['content-scripts/one.css'],
+        js: ['content-scripts/one.js'],
+      });
     });
-    expect(manifest.content_scripts).toContainEqual({
-      matches: ['*://google.com/*'],
-      run_at: 'document_end',
-      css: ['assets/three.css', 'assets/two.css'],
-      js: ['content-scripts/three.js', 'content-scripts/two.js'],
-    });
-    expect(manifest.content_scripts).toContainEqual({
-      matches: ['*://google.com/*'],
-      css: ['assets/one.css'],
-      js: ['content-scripts/one.js'],
-    });
-  });
 
-  it('should add to any content scripts declared in wxt.config.ts', async () => {
-    const project = new TestProject();
-    project.addFile(
-      'entrypoints/one.content/index.ts',
-      `export default defineContentScript({
+    it('should add to any content scripts declared in wxt.config.ts', async () => {
+      const project = new TestProject();
+      project.addFile(
+        'entrypoints/one.content/index.ts',
+        `export default defineContentScript({
         matches: ["*://google.com/*"],
         main: () => {},
       })`,
-    );
-    project.addFile(
-      'entrypoints/two.content/style.css',
-      `body {
+      );
+      project.addFile(
+        'entrypoints/two.content/style.css',
+        `body {
         background-color: red;
       }`,
+      );
+      project.setConfigFileConfig({
+        manifest: {
+          content_scripts: [
+            {
+              css: ['content-scripts/two.css'],
+              matches: ['*://*.google.com/*'],
+            },
+          ],
+        },
+      });
+
+      await project.build();
+
+      const manifest = await project.getOutputManifest();
+
+      expect(manifest.content_scripts).toContainEqual({
+        css: ['content-scripts/two.css'],
+        matches: ['*://*.google.com/*'],
+      });
+      expect(manifest.content_scripts).toContainEqual({
+        matches: ['*://google.com/*'],
+        js: ['content-scripts/one.js'],
+      });
+    });
+
+    it('should add a CSS entry when cssInjectionMode is undefined', async () => {
+      const project = new TestProject();
+      project.addFile(
+        'entrypoints/content/style.css',
+        'body { background-color: red; }',
+      );
+      project.addFile(
+        'entrypoints/content/index.ts',
+        `import "./style.css";
+        
+        export default defineContentScript({
+          matches: ["https://*.google.com/*"],
+
+          main() {},
+        });`,
+      );
+      await project.build();
+
+      expect(await project.serializeFile('.output/chrome-mv3/manifest.json'))
+        .toMatchInlineSnapshot(`
+          ".output/chrome-mv3/manifest.json
+          ----------------------------------------
+          {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"content_scripts\\":[{\\"matches\\":[\\"https://*.google.com/*\\"],\\"css\\":[\\"content-scripts/content.css\\"],\\"js\\":[\\"content-scripts/content.js\\"]}]}"
+        `);
+    });
+
+    it('should add a CSS entry when cssInjectionMode is "manifest"', async () => {
+      const project = new TestProject();
+      project.addFile(
+        'entrypoints/content/style.css',
+        'body { background-color: red; }',
+      );
+      project.addFile(
+        'entrypoints/content/index.ts',
+        `import "./style.css";
+        
+        export default defineContentScript({
+          matches: ["https://*.google.com/*"],
+          cssInjectionMode: "manifest",
+
+          main() {},
+        });`,
+      );
+      await project.build();
+
+      expect(await project.serializeFile('.output/chrome-mv3/manifest.json'))
+        .toMatchInlineSnapshot(`
+          ".output/chrome-mv3/manifest.json
+          ----------------------------------------
+          {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"content_scripts\\":[{\\"matches\\":[\\"https://*.google.com/*\\"],\\"css\\":[\\"content-scripts/content.css\\"],\\"js\\":[\\"content-scripts/content.js\\"]}]}"
+        `);
+    });
+
+    it('should not add an entry for CSS when cssInjectionMode is "manual"', async () => {
+      const project = new TestProject();
+      project.addFile(
+        'entrypoints/content/style.css',
+        'body { background-color: red; }',
+      );
+      project.addFile(
+        'entrypoints/content/index.ts',
+        `import "./style.css";
+        
+        export default defineContentScript({
+          matches: ["https://*.google.com/*"],
+          cssInjectionMode: "manual",
+
+          main() {},
+        });`,
+      );
+      await project.build();
+
+      expect(await project.serializeFile('.output/chrome-mv3/manifest.json'))
+        .toMatchInlineSnapshot(`
+        ".output/chrome-mv3/manifest.json
+        ----------------------------------------
+        {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"content_scripts\\":[{\\"matches\\":[\\"https://*.google.com/*\\"],\\"js\\":[\\"content-scripts/content.js\\"]}]}"
+      `);
+    });
+
+    it('should not add a content script entry for CSS when cssInjectionMode is "ui", but add a web_accessible_resources entry for MV2', async () => {
+      const project = new TestProject();
+      project.addFile(
+        'entrypoints/content/style.css',
+        'body { background-color: red; }',
+      );
+      project.addFile(
+        'entrypoints/content/index.ts',
+        `import "./style.css";
+        
+        export default defineContentScript({
+          matches: ["https://*.google.com/*"],
+          cssInjectionMode: "ui",
+
+          main() {},
+        });`,
+      );
+      await project.build({
+        manifestVersion: 2,
+      });
+
+      expect(await project.serializeFile('.output/chrome-mv2/manifest.json'))
+        .toMatchInlineSnapshot(`
+          ".output/chrome-mv2/manifest.json
+          ----------------------------------------
+          {\\"manifest_version\\":2,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"content_scripts\\":[{\\"matches\\":[\\"https://*.google.com/*\\"],\\"js\\":[\\"content-scripts/content.js\\"]}],\\"web_accessible_resources\\":[\\"content-scripts/content.css\\"]}"
+        `);
+    });
+
+    it('should not add a content script entry for CSS when cssInjectionMode is "ui", but add a web_accessible_resources entry for MV3', async () => {
+      const project = new TestProject();
+      project.addFile(
+        'entrypoints/content/style.css',
+        'body { background-color: red; }',
+      );
+      project.addFile(
+        'entrypoints/content/index.ts',
+        `import "./style.css";
+        
+        export default defineContentScript({
+          matches: ["https://*.google.com/*"],
+          cssInjectionMode: "ui",
+
+          main() {},
+        });`,
+      );
+      await project.build({
+        manifestVersion: 3,
+      });
+
+      expect(await project.serializeFile('.output/chrome-mv3/manifest.json'))
+        .toMatchInlineSnapshot(`
+          ".output/chrome-mv3/manifest.json
+          ----------------------------------------
+          {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"content_scripts\\":[{\\"matches\\":[\\"https://*.google.com/*\\"],\\"js\\":[\\"content-scripts/content.js\\"]}],\\"web_accessible_resources\\":[{\\"resources\\":[\\"content-scripts/content.css\\"],\\"matches\\":[\\"https://*.google.com/*\\"]}]}"
+        `);
+    });
+  });
+
+  it('should combine web accessible resources', async () => {
+    const project = new TestProject();
+    project.addFile(
+      'entrypoints/content/style.css',
+      'body { background-color: red; }',
+    );
+    project.addFile(
+      'entrypoints/content/index.ts',
+      `import "./style.css";
+      
+      export default defineContentScript({
+        matches: ["https://*.google.com/*"],
+        cssInjectionMode: "ui",
+
+        main() {},
+      });`,
     );
     project.setConfigFileConfig({
       manifest: {
-        content_scripts: [
-          {
-            css: ['content-scripts/two.css'],
-            matches: ['*://*.google.com/*'],
-          },
+        web_accessible_resources: [
+          { resources: ['one.png'], matches: ['https://one.com/*'] },
         ],
       },
     });
-
     await project.build();
 
-    const manifest = await project.getOutputManifest();
-
-    expect(manifest.content_scripts).toContainEqual({
-      css: ['content-scripts/two.css'],
-      matches: ['*://*.google.com/*'],
-    });
-    expect(manifest.content_scripts).toContainEqual({
-      matches: ['*://google.com/*'],
-      js: ['content-scripts/one.js'],
-    });
+    expect(await project.serializeFile('.output/chrome-mv3/manifest.json'))
+      .toMatchInlineSnapshot(`
+        ".output/chrome-mv3/manifest.json
+        ----------------------------------------
+        {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"web_accessible_resources\\":[{\\"resources\\":[\\"one.png\\"],\\"matches\\":[\\"https://one.com/*\\"]},{\\"resources\\":[\\"content-scripts/content.css\\"],\\"matches\\":[\\"https://*.google.com/*\\"]}],\\"content_scripts\\":[{\\"matches\\":[\\"https://*.google.com/*\\"],\\"js\\":[\\"content-scripts/content.js\\"]}]}"
+      `);
   });
 
   it('should respect the transformManifest option', async () => {
@@ -331,4 +508,33 @@ describe('Manifest Content', () => {
       {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"author\\":\\"Custom Author\\"}"
     `);
   });
+
+  it.each([
+    { browser: undefined, outDir: 'chrome-mv3', expected: undefined },
+    { browser: 'chrome', outDir: 'chrome-mv3', expected: undefined },
+    { browser: 'firefox', outDir: 'firefox-mv2', expected: true },
+    { browser: 'safari', outDir: 'safari-mv2', expected: false },
+  ])(
+    'should respect the per-browser entrypoint option with %j',
+    async ({ browser, expected, outDir }) => {
+      const project = new TestProject();
+
+      project.addFile(
+        'entrypoints/background.ts',
+        `export default defineBackground({
+          persistent: {
+            firefox: true,
+            safari: false,
+          },
+          main: () => {},
+        })`,
+      );
+      await project.build({ browser });
+
+      const safariManifest = await project.getOutputManifest(
+        `.output/${outDir}/manifest.json`,
+      );
+      expect(safariManifest.background.persistent).toBe(expected);
+    },
+  );
 });

e2e/tests/output-structure.test.ts

@@ -49,19 +49,19 @@ describe('Output Directory Structure', () => {
         '.output/chrome-mv3/content-scripts/two.js',
       ]),
     ).toMatchInlineSnapshot(`
-      ".output/chrome-mv3/assets/one.css
+      ".output/chrome-mv3/content-scripts/one.css
       ----------------------------------------
       body{color:#00f}
 
-      ================================================================================
-      .output/chrome-mv3/assets/two.css
-      ----------------------------------------
-      body{color:red}
-
       ================================================================================
       .output/chrome-mv3/content-scripts/one.js
       ----------------------------------------
       <contents-ignored>
+      ================================================================================
+      .output/chrome-mv3/content-scripts/two.css
+      ----------------------------------------
+      body{color:red}
+
       ================================================================================
       .output/chrome-mv3/content-scripts/two.js
       ----------------------------------------
@@ -69,7 +69,7 @@ describe('Output Directory Structure', () => {
       ================================================================================
       .output/chrome-mv3/manifest.json
       ----------------------------------------
-      {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"content_scripts\\":[{\\"matches\\":[\\"*://*/*\\"],\\"css\\":[\\"assets/one.css\\",\\"assets/two.css\\"],\\"js\\":[\\"content-scripts/one.js\\",\\"content-scripts/two.js\\"]}]}"
+      {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"content_scripts\\":[{\\"matches\\":[\\"*://*/*\\"],\\"css\\":[\\"content-scripts/one.css\\",\\"content-scripts/two.css\\"],\\"js\\":[\\"content-scripts/one.js\\",\\"content-scripts/two.js\\"]}]}"
     `);
   });
 
@@ -165,4 +165,44 @@ describe('Output Directory Structure', () => {
 
     expect(await project.fileExists('stats.html')).toBe(true);
   });
+
+  it('should support JavaScript entrypoints', async () => {
+    const project = new TestProject();
+    project.addFile(
+      'entrypoints/background.js',
+      `export default defineBackground(() => {});`,
+    );
+    project.addFile('entrypoints/unlisted.js', ``);
+    project.addFile(
+      'entrypoints/content.js',
+      `export default defineContentScript({
+        matches: ["*://*.google.com/*"],
+        main() {},
+      })`,
+    );
+    project.addFile(
+      'entrypoints/named.content.jsx',
+      `export default defineContentScript({
+        matches: ["*://*.duckduckgo.com/*"],
+        main() {},
+      })`,
+    );
+
+    await project.build();
+
+    expect(await project.serializeFile('.output/chrome-mv3/manifest.json'))
+      .toMatchInlineSnapshot(`
+      ".output/chrome-mv3/manifest.json
+      ----------------------------------------
+      {\\"manifest_version\\":3,\\"name\\":\\"E2E Extension\\",\\"description\\":\\"Example description\\",\\"version\\":\\"0.0.0\\",\\"version_name\\":\\"0.0.0-test\\",\\"background\\":{\\"service_worker\\":\\"background.js\\"},\\"content_scripts\\":[{\\"matches\\":[\\"*://*.google.com/*\\"],\\"js\\":[\\"content-scripts/content.js\\"]},{\\"matches\\":[\\"*://*.duckduckgo.com/*\\"],\\"js\\":[\\"content-scripts/named.js\\"]}]}"
+    `);
+    expect(await project.fileExists('.output/chrome-mv3/background.js'));
+    expect(
+      await project.fileExists('.output/chrome-mv3/content-scripts/content.js'),
+    );
+    expect(
+      await project.fileExists('.output/chrome-mv3/content-scripts/named.js'),
+    );
+    expect(await project.fileExists('.output/chrome-mv3/unlisted.js'));
+  });
 });

e2e/tests/typescript-project.test.ts

@@ -255,14 +255,14 @@ describe('TypeScript Project', () => {
           \\"lib\\": [\\"DOM\\", \\"WebWorker\\"],
           \\"skipLibCheck\\": true,
           \\"paths\\": {
-            \\"@@\\": [\\"..\\"],
-            \\"@@/*\\": [\\"../*\\"],
-            \\"~~\\": [\\"..\\"],
-            \\"~~/*\\": [\\"../*\\"],
             \\"@\\": [\\"..\\"],
             \\"@/*\\": [\\"../*\\"],
             \\"~\\": [\\"..\\"],
-            \\"~/*\\": [\\"../*\\"]
+            \\"~/*\\": [\\"../*\\"],
+            \\"@@\\": [\\"..\\"],
+            \\"@@/*\\": [\\"../*\\"],
+            \\"~~\\": [\\"..\\"],
+            \\"~~/*\\": [\\"../*\\"]
           }
         },
         \\"include\\": [
@@ -299,14 +299,14 @@ describe('TypeScript Project', () => {
           \\"lib\\": [\\"DOM\\", \\"WebWorker\\"],
           \\"skipLibCheck\\": true,
           \\"paths\\": {
-            \\"@@\\": [\\"..\\"],
-            \\"@@/*\\": [\\"../*\\"],
-            \\"~~\\": [\\"..\\"],
-            \\"~~/*\\": [\\"../*\\"],
             \\"@\\": [\\"../src\\"],
             \\"@/*\\": [\\"../src/*\\"],
             \\"~\\": [\\"../src\\"],
-            \\"~/*\\": [\\"../src/*\\"]
+            \\"~/*\\": [\\"../src/*\\"],
+            \\"@@\\": [\\"..\\"],
+            \\"@@/*\\": [\\"../*\\"],
+            \\"~~\\": [\\"..\\"],
+            \\"~~/*\\": [\\"../*\\"]
           }
         },
         \\"include\\": [

package.json

@@ -1,7 +1,7 @@
 {
   "name": "wxt",
   "type": "module",
-  "version": "0.6.6",
+  "version": "0.7.3",
   "description": "Next gen framework for developing web extensions",
   "engines": {
     "node": ">=18.16.0",
@@ -62,11 +62,12 @@
     "docs:dev": "vitepress dev docs",
     "docs:build": "vitepress build docs",
     "docs:preview": "vitepress preview docs",
-    "sync-releases": "pnpx changelogen@latest gh release all"
+    "sync-releases": "pnpx changelogen@latest gh release"
   },
   "dependencies": {
     "@types/webextension-polyfill": "^0.10.1",
     "@webext-core/fake-browser": "^1.2.2",
+    "@webext-core/isolated-element": "^1.0.4",
     "@webext-core/match-patterns": "^1.0.2",
     "async-mutex": "^0.4.0",
     "c12": "^1.4.2",
@@ -102,15 +103,16 @@
     "@types/prompts": "^2.4.4",
     "@vitest/coverage-v8": "^0.34.1",
     "execa": "^7.2.0",
+    "jsdom": "^22.1.0",
     "lint-staged": "^14.0.0",
     "lodash.merge": "^4.6.2",
     "npm-run-all": "^4.1.5",
     "prettier": "^3.0.1",
     "simple-git-hooks": "^2.9.0",
-    "ts-morph": "^19.0.0",
+    "ts-morph": "^20.0.0",
     "tsup": "^7.1.0",
     "tsx": "^3.12.7",
-    "typescript": "^5.1.6",
+    "typescript": "^5.2.2",
     "vitepress": "1.0.0-rc.10",
     "vitest": "^0.34.1",
     "vitest-mock-extended": "^1.1.4",

pnpm-lock.yaml

@@ -14,6 +14,9 @@ importers:
       '@webext-core/fake-browser':
         specifier: ^1.2.2
         version: 1.2.2
+      '@webext-core/isolated-element':
+        specifier: ^1.0.4
+        version: 1.0.4
       '@webext-core/match-patterns':
         specifier: ^1.0.2
         version: 1.0.2
@@ -95,10 +98,10 @@ importers:
     devDependencies:
       '@faker-js/faker':
         specifier: ^8.0.2
-        version: 8.0.2
+        version: 8.1.0
       '@types/fs-extra':
         specifier: ^11.0.1
-        version: 11.0.1
+        version: 11.0.2
       '@types/lodash.merge':
         specifier: ^4.6.7
         version: 4.6.7
@@ -114,6 +117,9 @@ importers:
       execa:
         specifier: ^7.2.0
         version: 7.2.0
+      jsdom:
+        specifier: ^22.1.0
+        version: 22.1.0
       lint-staged:
         specifier: ^14.0.0
         version: 14.0.1
@@ -130,26 +136,26 @@ importers:
         specifier: ^2.9.0
         version: 2.9.0
       ts-morph:
-        specifier: ^19.0.0
-        version: 19.0.0
+        specifier: ^20.0.0
+        version: 20.0.0
       tsup:
         specifier: ^7.1.0
-        version: 7.2.0(typescript@5.1.6)
+        version: 7.2.0(typescript@5.2.2)
       tsx:
         specifier: ^3.12.7
         version: 3.12.8
       typescript:
-        specifier: ^5.1.6
-        version: 5.1.6
+        specifier: ^5.2.2
+        version: 5.2.2
       vitepress:
         specifier: 1.0.0-rc.10
         version: 1.0.0-rc.10(@types/node@20.5.9)
       vitest:
         specifier: ^0.34.1
-        version: 0.34.3
+        version: 0.34.3(jsdom@22.1.0)
       vitest-mock-extended:
         specifier: ^1.1.4
-        version: 1.2.1(typescript@5.1.6)(vitest@0.34.3)
+        version: 1.3.0(typescript@5.2.2)(vitest@0.34.3)
       vue:
         specifier: ^3.3.4
         version: 3.3.4
@@ -848,8 +854,8 @@ packages:
     dev: false
     optional: true
 
-  /@faker-js/faker@8.0.2:
-    resolution: {integrity: sha512-Uo3pGspElQW91PCvKSIAXoEgAUlRnH29sX2/p89kg7sP1m2PzCufHINd0FhTXQf6DYGiUlVncdSPa2F9wxed2A==}
+  /@faker-js/faker@8.1.0:
+    resolution: {integrity: sha512-38DT60rumHfBYynif3lmtxMqMqmsOQIxQgEuPZxCk2yUYN0eqWpTACgxi0VpidvsJB8CRxCpvP7B3anK85FjtQ==}
     engines: {node: ^14.17.0 || ^16.13.0 || >=18.0.0, npm: '>=6.14.13'}
     dev: true
 
@@ -967,8 +973,13 @@ packages:
       defer-to-connect: 2.0.1
     dev: false
 
-  /@ts-morph/common@0.20.0:
-    resolution: {integrity: sha512-7uKjByfbPpwuzkstL3L5MQyuXPSKdoNG93Fmi2JoDcTf3pEP731JdRFAduRVkOs8oqxPsXKA+ScrWkdQ8t/I+Q==}
+  /@tootallnate/once@2.0.0:
+    resolution: {integrity: sha512-XCuKFP5PS55gnMVu3dty8KPatLqUoy/ZYzDzAGCQ8JNFCkLXzmI7vNHCR+XpbZaMWQK/vQubr7PkYq8g470J/A==}
+    engines: {node: '>= 10'}
+    dev: true
+
+  /@ts-morph/common@0.21.0:
+    resolution: {integrity: sha512-ES110Mmne5Vi4ypUKrtVQfXFDtCsDXiUiGxF6ILVlE90dDD4fdpC1LSjydl/ml7xJWKSDZwUYD2zkOePMSrPBA==}
     dependencies:
       fast-glob: 3.3.1
       minimatch: 7.4.6
@@ -990,8 +1001,8 @@ packages:
     resolution: {integrity: sha512-LG4opVs2ANWZ1TJoKc937iMmNstM/d0ae1vNbnBvBhqCSezgVUOzcLCqbI5elV8Vy6WKwKjaqR+zO9VKirBBCA==}
     dev: false
 
-  /@types/fs-extra@11.0.1:
-    resolution: {integrity: sha512-MxObHvNl4A69ofaTRU8DFqvgzzv8s9yRtaPPm5gud9HDNvpB3GPQFvNuTWAI59B9huVGV5jXYJwbCsmBsOGYWA==}
+  /@types/fs-extra@11.0.2:
+    resolution: {integrity: sha512-c0hrgAOVYr21EX8J0jBMXGLMgJqVf/v6yxi0dLaJboW9aQPh16Id+z6w2Tx1hm+piJOLv8xPfVKZCLfjPw/IMQ==}
     dependencies:
       '@types/jsonfile': 6.1.1
       '@types/node': 20.5.9
@@ -1085,7 +1096,7 @@ packages:
       std-env: 3.3.3
       test-exclude: 6.0.0
       v8-to-istanbul: 9.1.0
-      vitest: 0.34.3
+      vitest: 0.34.3(jsdom@22.1.0)
     transitivePeerDependencies:
       - supports-color
     dev: true
@@ -1300,12 +1311,20 @@ packages:
       lodash.merge: 4.6.2
     dev: false
 
+  /@webext-core/isolated-element@1.0.4:
+    resolution: {integrity: sha512-jbkG+7b6Ty4fNo2o53rokCTkNRinI/0tneJSyuUCJfPzAFtyylF3IxH/WhXykXC+1Ca8ouQnjbEcpYt9IFNcUg==}
+    dev: false
+
   /@webext-core/match-patterns@1.0.2:
     resolution: {integrity: sha512-ApmXwA2HRCgt/vXaZw8NfyV3hBqsyO7wAork4qgH+AtCJW4uRxHbMruSKJ0Flh/yOGMbrbLixd3E9Yw5dmGygw==}
     dependencies:
       '@webcomponents/webcomponentsjs': 2.8.0
     dev: false
 
+  /abab@2.0.6:
+    resolution: {integrity: sha512-j2afSsaIENvHZN2B8GOpF566vZ5WVk5opAiMTvWgaQT8DkbOqsTfvNAvHoRGU2zzP8cPoqys+xHTRDWW8L+/BA==}
+    dev: true
+
   /acorn-walk@8.2.0:
     resolution: {integrity: sha512-k+iyHEuPgSw6SbuDpGQM+06HQUa04DZ3o+F6CSzXMvvI5KMvnaEqXe+YVe555R9nn6GPt404fos4wcgpw12SDA==}
     engines: {node: '>=0.4.0'}
@@ -1328,7 +1347,6 @@ packages:
       debug: 4.3.4
     transitivePeerDependencies:
       - supports-color
-    dev: false
 
   /algoliasearch@4.19.1:
     resolution: {integrity: sha512-IJF5b93b2MgAzcE/tuzW0yOPnuUyRgGAtaPv5UUywXM8kzqfdwZTO4sPJBzoGz1eOy6H9uEchsJsBFTELZSu+g==}
@@ -1443,6 +1461,10 @@ packages:
     resolution: {integrity: sha512-iAB+JbDEGXhyIUavoDl9WP/Jj106Kz9DEn1DPgYw5ruDn0e3Wgi3sKFm55sASdGBNOQB8F59d9qQ7deqrHA8wQ==}
     dev: false
 
+  /asynckit@0.4.0:
+    resolution: {integrity: sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==}
+    dev: true
+
   /at-least-node@1.0.0:
     resolution: {integrity: sha512-+q/t7Ekv1EDY2l6Gda6LLiX14rU9TV20Wa3ofeQmwPFZbOMo9DXrLbOjFaaclkXKWidIaopwAObQDqwWtGUjqg==}
     engines: {node: '>= 4.0.0'}
@@ -1719,6 +1741,13 @@ packages:
   /colorette@2.0.20:
     resolution: {integrity: sha512-IfEDxwoWIjkeXL1eXcDiow4UbKjhLdq6/EuSVR9GMN7KVH3r9gQ83e73hsz1Nd1T3ijd5xv1wcWRYO+D6kCI2w==}
 
+  /combined-stream@1.0.8:
+    resolution: {integrity: sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==}
+    engines: {node: '>= 0.8'}
+    dependencies:
+      delayed-stream: 1.0.0
+    dev: true
+
   /commander@11.0.0:
     resolution: {integrity: sha512-9HMlXtt/BNoYr8ooyjjNRdIilOTkVJXB+GhxMTtOKwk0R4j4lS4NpjuqmRxroBfnfTSHQIHQB7wryHhXarNjmQ==}
     engines: {node: '>=16'}
@@ -1831,10 +1860,26 @@ packages:
     resolution: {integrity: sha512-iKuQcq+NdHqlAcwUY0o/HL69XQrUaQdMjmStJ8JFmUaiiQErlhrmuigkg/CU4E2J0IyUKUrMAgl36TvN67MqTw==}
     dev: false
 
+  /cssstyle@3.0.0:
+    resolution: {integrity: sha512-N4u2ABATi3Qplzf0hWbVCdjenim8F3ojEXpBDF5hBpjzW182MjNGLqfmQ0SkSPeQ+V86ZXgeH8aXj6kayd4jgg==}
+    engines: {node: '>=14'}
+    dependencies:
+      rrweb-cssom: 0.6.0
+    dev: true
+
   /csstype@3.1.2:
     resolution: {integrity: sha512-I7K1Uu0MBPzaFKg4nI5Q7Vs2t+3gWWW648spaF+Rg7pI9ds18Ugn+lvg4SHczUdKlHI5LWBXyqfS8+DufyBsgQ==}
     dev: true
 
+  /data-urls@4.0.0:
+    resolution: {integrity: sha512-/mMTei/JXPqvFqQtfyTowxmJVwr2PVAeCcDxyFf6LhoOu/09TX2OX3kb2wzi4DMXcfj4OItwDOnhl5oziPnT6g==}
+    engines: {node: '>=14'}
+    dependencies:
+      abab: 2.0.6
+      whatwg-mimetype: 3.0.0
+      whatwg-url: 12.0.1
+    dev: true
+
   /debounce@1.2.1:
     resolution: {integrity: sha512-XRRe6Glud4rd/ZGQfiV1ruXSfbvfJedlV9Y6zOlP+2K04vBYiJEte6stfFkCP03aMnY5tsipamumUjL14fofug==}
     dev: false
@@ -1861,6 +1906,10 @@ packages:
     dependencies:
       ms: 2.1.2
 
+  /decimal.js@10.4.3:
+    resolution: {integrity: sha512-VBBaLc1MgL5XpzgIP7ny5Z6Nx3UrRkIViUkPUdtl9aya5amy3De1gsUUSB1g3+3sExYNjCAsAznmukyxCb1GRA==}
+    dev: true
+
   /decompress-response@6.0.0:
     resolution: {integrity: sha512-aW35yZM6Bb/4oJlZncMH2LCoZtJXTRxES17vE3hoRiowU2kWHaJKFkSBDnDR+cm9J+9QhXmREyIfv0pji9ejCQ==}
     engines: {node: '>=10'}
@@ -1902,6 +1951,11 @@ packages:
     resolution: {integrity: sha512-+uO4+qr7msjNNWKYPHqN/3+Dx3NFkmIzayk2L1MyZQlvgZb/J1A0fo410dpKrN2SnqFjt8n4JL8fDJE0wIgjFQ==}
     dev: false
 
+  /delayed-stream@1.0.0:
+    resolution: {integrity: sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==}
+    engines: {node: '>=0.4.0'}
+    dev: true
+
   /destr@2.0.0:
     resolution: {integrity: sha512-FJ9RDpf3GicEBvzI3jxc2XhHzbqD8p4ANw/1kPsFBfTvP1b7Gn/Lg1vO7R9J4IVgoMbyUmFrFGZafJ1hPZpvlg==}
     dev: false
@@ -1930,6 +1984,13 @@ packages:
     resolution: {integrity: sha512-OLETBj6w0OsagBwdXnPdN0cnMfF9opN69co+7ZrbfPGrdpPVNBUj02spi6B1N7wChLQiPn4CSH/zJvXw56gmHw==}
     dev: false
 
+  /domexception@4.0.0:
+    resolution: {integrity: sha512-A2is4PLG+eeSfoTMA95/s4pvAoSo2mKtiM5jlHkAVewmiO8ISFTFKZjH7UAM1Atli/OT/7JHOrJRJiMKUZKYBw==}
+    engines: {node: '>=12'}
+    dependencies:
+      webidl-conversions: 7.0.0
+    dev: true
+
   /domhandler@5.0.3:
     resolution: {integrity: sha512-cgwlv/1iFQiFnU96XXgROh8xTeetsnJiDsTc7TYCLFd9+/WNkIqPTxiM/8pSd8VIrhXGTf1Ny1q1hquVqDJB5w==}
     engines: {node: '>= 4'}
@@ -1983,7 +2044,6 @@ packages:
   /entities@4.5.0:
     resolution: {integrity: sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw==}
     engines: {node: '>=0.12'}
-    dev: false
 
   /error-ex@1.3.2:
     resolution: {integrity: sha512-7dFHNmqeFSEt2ZBsCriorKnn3Z2pj+fd9kmI6QoWw4//DL+icEBfc0U7qJCisqrTsKTjw4fNFy2pW9OqStD84g==}
@@ -2231,6 +2291,15 @@ packages:
     engines: {node: '>= 14.17'}
     dev: false
 
+  /form-data@4.0.0:
+    resolution: {integrity: sha512-ETEklSGi5t0QMZuiXoA/Q6vcnxcLQP5vdugSpuAyi6SVGi2clPPp+xgEhuMaHC+zGgn31Kd235W35f7Hykkaww==}
+    engines: {node: '>= 6'}
+    dependencies:
+      asynckit: 0.4.0
+      combined-stream: 1.0.8
+      mime-types: 2.1.35
+    dev: true
+
   /fs-extra@11.1.1:
     resolution: {integrity: sha512-MGIE4HOvQCeUCzmlHs0vXpih4ysz4wg9qiSAu6cd42lVwPbTM1TjV7RusoyQqMmk/95gdQZX72u+YW+c3eEpFQ==}
     engines: {node: '>=14.14'}
@@ -2500,6 +2569,13 @@ packages:
     resolution: {integrity: sha512-mxIDAb9Lsm6DoOJ7xH+5+X4y1LU/4Hi50L9C5sIswK3JzULS4bwk1FvjdBgvYR4bzT4tuUQiC15FE2f5HbLvYw==}
     dev: true
 
+  /html-encoding-sniffer@3.0.0:
+    resolution: {integrity: sha512-oWv4T4yJ52iKrufjnyZPkrN0CH3QnrUqdB6In1g5Fe1mia8GmF36gnfNySxoZtxD5+NmYw1EElVXiBk93UeskA==}
+    engines: {node: '>=12'}
+    dependencies:
+      whatwg-encoding: 2.0.0
+    dev: true
+
   /html-escaper@2.0.2:
     resolution: {integrity: sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==}
     dev: true
@@ -2521,6 +2597,17 @@ packages:
     resolution: {integrity: sha512-er295DKPVsV82j5kw1Gjt+ADA/XYHsajl82cGNQG2eyoPkvgUhX+nDIyelzhIWbbsXP39EHcI6l5tYs2FYqYXQ==}
     dev: false
 
+  /http-proxy-agent@5.0.0:
+    resolution: {integrity: sha512-n2hY8YdoRE1i7r6M0w9DIw5GgZN0G25P8zLCRQ8rjXtTU3vsNFBI/vWK/UIeE6g5MUUz6avwAPXmL6Fy9D/90w==}
+    engines: {node: '>= 6'}
+    dependencies:
+      '@tootallnate/once': 2.0.0
+      agent-base: 6.0.2
+      debug: 4.3.4
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
   /http2-wrapper@2.2.0:
     resolution: {integrity: sha512-kZB0wxMo0sh1PehyjJUWRFEd99KC5TLjZ2cULC4f9iqJBAmKQQXEICjxl5iPJRwP40dpeHFqqhm7tYCvODpqpQ==}
     engines: {node: '>=10.19.0'}
@@ -2537,7 +2624,6 @@ packages:
       debug: 4.3.4
     transitivePeerDependencies:
       - supports-color
-    dev: false
 
   /human-signals@2.1.0:
     resolution: {integrity: sha512-B4FFZ6q/T2jhhksgkbEW3HBvWIfDW85snkQgawt07S7J5QXTk6BkNV+0yAeZrM5QpMAdYlocGoljn0sJ/WQkFw==}
@@ -2549,6 +2635,13 @@ packages:
     engines: {node: '>=14.18.0'}
     dev: true
 
+  /iconv-lite@0.6.3:
+    resolution: {integrity: sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==}
+    engines: {node: '>=0.10.0'}
+    dependencies:
+      safer-buffer: 2.1.2
+    dev: true
+
   /ieee754@1.2.1:
     resolution: {integrity: sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==}
     dev: false
@@ -2746,6 +2839,10 @@ packages:
     engines: {node: '>=8'}
     dev: false
 
+  /is-potential-custom-element-name@1.0.1:
+    resolution: {integrity: sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ==}
+    dev: true
+
   /is-regex@1.1.4:
     resolution: {integrity: sha512-kvRdxDsxZjhzUX07ZnLydzS1TU/TJlTUHHY4YLL87e37oUA49DfkLqgy+VjFocowy29cKvcSiu+kIv728jTTVg==}
     engines: {node: '>= 0.4'}
@@ -2892,6 +2989,44 @@ packages:
     resolution: {integrity: sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==}
     dev: false
 
+  /jsdom@22.1.0:
+    resolution: {integrity: sha512-/9AVW7xNbsBv6GfWho4TTNjEo9fe6Zhf9O7s0Fhhr3u+awPwAJMKwAMXnkk5vBxflqLW9hTHX/0cs+P3gW+cQw==}
+    engines: {node: '>=16'}
+    peerDependencies:
+      canvas: ^2.5.0
+    peerDependenciesMeta:
+      canvas:
+        optional: true
+    dependencies:
+      abab: 2.0.6
+      cssstyle: 3.0.0
+      data-urls: 4.0.0
+      decimal.js: 10.4.3
+      domexception: 4.0.0
+      form-data: 4.0.0
+      html-encoding-sniffer: 3.0.0
+      http-proxy-agent: 5.0.0
+      https-proxy-agent: 5.0.1
+      is-potential-custom-element-name: 1.0.1
+      nwsapi: 2.2.7
+      parse5: 7.1.2
+      rrweb-cssom: 0.6.0
+      saxes: 6.0.0
+      symbol-tree: 3.2.4
+      tough-cookie: 4.1.3
+      w3c-xmlserializer: 4.0.0
+      webidl-conversions: 7.0.0
+      whatwg-encoding: 2.0.0
+      whatwg-mimetype: 3.0.0
+      whatwg-url: 12.0.1
+      ws: 8.13.0
+      xml-name-validator: 4.0.0
+    transitivePeerDependencies:
+      - bufferutil
+      - supports-color
+      - utf-8-validate
+    dev: true
+
   /json-buffer@3.0.1:
     resolution: {integrity: sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ==}
     dev: false
@@ -3145,6 +3280,18 @@ packages:
       braces: 3.0.2
       picomatch: 2.3.1
 
+  /mime-db@1.52.0:
+    resolution: {integrity: sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==}
+    engines: {node: '>= 0.6'}
+    dev: true
+
+  /mime-types@2.1.35:
+    resolution: {integrity: sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==}
+    engines: {node: '>= 0.6'}
+    dependencies:
+      mime-db: 1.52.0
+    dev: true
+
   /mimic-fn@2.1.0:
     resolution: {integrity: sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==}
     engines: {node: '>=6'}
@@ -3388,6 +3535,10 @@ packages:
       boolbase: 1.0.0
     dev: false
 
+  /nwsapi@2.2.7:
+    resolution: {integrity: sha512-ub5E4+FBPKwAZx0UwIQOjYWGHTEq5sPqHQNRN8Z9e4A7u3Tj1weLJsL59yH9vmvqEtBHaOmT6cYQKIZOxp35FQ==}
+    dev: true
+
   /object-assign@4.1.1:
     resolution: {integrity: sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==}
     engines: {node: '>=0.10.0'}
@@ -3507,6 +3658,12 @@ packages:
       type-fest: 3.13.1
     dev: false
 
+  /parse5@7.1.2:
+    resolution: {integrity: sha512-Czj1WaSVpaoj0wbhMzLmWD69anp2WH7FXMB9n1Sy8/ZFF9jolSQVMu1Ij5WIyGmcBmhk7EOndpO4mIpihVqAXw==}
+    dependencies:
+      entities: 4.5.0
+    dev: true
+
   /path-browserify@1.0.1:
     resolution: {integrity: sha512-b7uo2UCUOYZcnF/3ID0lulOJi/bafxa1xPe7ZPsammBSpjSWQkjNxlt635YGS2MiR9GjvuXCtz2emr3jbsz98g==}
     dev: true
@@ -3659,6 +3816,10 @@ packages:
     resolution: {integrity: sha512-vtK/94akxsTMhe0/cbfpR+syPuszcuwhqVjJq26CuNDgFGj682oRBXOP5MJpv2r7JtE8MsiepGIqvvOTBwn2vA==}
     dev: false
 
+  /psl@1.9.0:
+    resolution: {integrity: sha512-E/ZsdU4HLs/68gYzgGTkMicWTLPdAftJLfJFlLUAAKZGkStNU72sZjT66SnMDVOfOWY/YAoiD7Jxa9iHvngcag==}
+    dev: true
+
   /punycode@2.3.0:
     resolution: {integrity: sha512-rRV+zQD8tVFys26lAGR9WUuS4iUAngJScM+ZRSKtvl5tKeZ2t5bvdNFdNHBW9FWR4guGHlgmsZ1G7BSm2wTbuA==}
     engines: {node: '>=6'}
@@ -3671,6 +3832,10 @@ packages:
       escape-goat: 4.0.0
     dev: false
 
+  /querystringify@2.2.0:
+    resolution: {integrity: sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==}
+    dev: true
+
   /queue-microtask@1.2.3:
     resolution: {integrity: sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==}
 
@@ -3786,6 +3951,10 @@ packages:
     engines: {node: '>=0.10.0'}
     dev: false
 
+  /requires-port@1.0.0:
+    resolution: {integrity: sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==}
+    dev: true
+
   /resolve-alpn@1.2.1:
     resolution: {integrity: sha512-0a1F4l73/ZFZOakJnQ3FvkJ2+gSTQWz/r2KE5OdDY0TxPm5h4GkqkWWfM47T7HsbnOtcJVEF4epCVy6u7Q3K+g==}
     dev: false
@@ -3876,6 +4045,10 @@ packages:
     optionalDependencies:
       fsevents: 2.3.2
 
+  /rrweb-cssom@0.6.0:
+    resolution: {integrity: sha512-APM0Gt1KoXBz0iIkkdB/kfvGOwC4UuJFeG/c+yV7wSc7q96cG/kJ0HiYCnzivD9SB53cLV1MlHFNfOuPaadYSw==}
+    dev: true
+
   /run-parallel@1.2.0:
     resolution: {integrity: sha512-5l4VyZR86LZ/lDxZTR6jqL8AFE2S0IFLMP26AbjsLVADxHdhB/c0GUsH+y39UfCi3dzz8OlQuPmnaJOMoDHQBA==}
     dependencies:
@@ -3899,6 +4072,10 @@ packages:
       is-regex: 1.1.4
     dev: true
 
+  /safer-buffer@2.1.2:
+    resolution: {integrity: sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==}
+    dev: true
+
   /sass@1.64.0:
     resolution: {integrity: sha512-m7YtAGmQta9uANIUJwXesAJMSncqH+3INc8kdVXs6eV6GUC8Qu2IYKQSN8PRLgiQfpca697G94klm2leYMxSHw==}
     engines: {node: '>=14.0.0'}
@@ -3913,6 +4090,13 @@ packages:
     resolution: {integrity: sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==}
     dev: false
 
+  /saxes@6.0.0:
+    resolution: {integrity: sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==}
+    engines: {node: '>=v12.22.7'}
+    dependencies:
+      xmlchars: 2.2.0
+    dev: true
+
   /scheduler@0.23.0:
     resolution: {integrity: sha512-CtuThmgHNg7zIZWAXi3AsyIzA3n4xx7aNyjwC2VJldO2LMVDhFK+63xGqq6CsJH4rTAt6/M+N4GhZiDYPx9eUw==}
     dependencies:
@@ -4257,6 +4441,10 @@ packages:
     engines: {node: '>= 0.4'}
     dev: true
 
+  /symbol-tree@3.2.4:
+    resolution: {integrity: sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==}
+    dev: true
+
   /tabbable@6.2.0:
     resolution: {integrity: sha512-Cat63mxsVJlzYvN51JmVXIgNoUokrIaT2zLclCXjRd8boZ0004U4KCs/sToJ75C6sdlByWxpYnb5Boif1VSFew==}
     dev: true
@@ -4329,33 +4517,50 @@ packages:
     dependencies:
       is-number: 7.0.0
 
+  /tough-cookie@4.1.3:
+    resolution: {integrity: sha512-aX/y5pVRkfRnfmuX+OdbSdXvPe6ieKX/G2s7e98f4poJHnqH3281gDPm/metm6E/WRamfx7WC4HUqkWHfQHprw==}
+    engines: {node: '>=6'}
+    dependencies:
+      psl: 1.9.0
+      punycode: 2.3.0
+      universalify: 0.2.0
+      url-parse: 1.5.10
+    dev: true
+
   /tr46@1.0.1:
     resolution: {integrity: sha512-dTpowEjclQ7Kgx5SdBkqRzVhERQXov8/l9Ft9dVM9fmg0W0KQSVaXX9T4i6twCPNtYiZM53lpSSUAwJbFPOHxA==}
     dependencies:
       punycode: 2.3.0
     dev: true
 
+  /tr46@4.1.1:
+    resolution: {integrity: sha512-2lv/66T7e5yNyhAAC4NaKe5nVavzuGJQVVtRYLyQ2OI8tsJ61PMLlelehb0wi2Hx6+hT/OJUWZcw8MjlSRnxvw==}
+    engines: {node: '>=14'}
+    dependencies:
+      punycode: 2.3.0
+    dev: true
+
   /tree-kill@1.2.2:
     resolution: {integrity: sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==}
     hasBin: true
     dev: true
 
-  /ts-essentials@9.3.2(typescript@5.1.6):
+  /ts-essentials@9.3.2(typescript@5.2.2):
     resolution: {integrity: sha512-JxKJzuWqH1MmH4ZFHtJzGEhkfN3QvVR3C3w+4BIoWeoY68UVVoA2Np/Bca9z0IPSErVCWhv439aT0We4Dks8kQ==}
     peerDependencies:
       typescript: '>=4.1.0'
     dependencies:
-      typescript: 5.1.6
+      typescript: 5.2.2
     dev: true
 
   /ts-interface-checker@0.1.13:
     resolution: {integrity: sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA==}
     dev: true
 
-  /ts-morph@19.0.0:
-    resolution: {integrity: sha512-D6qcpiJdn46tUqV45vr5UGM2dnIEuTGNxVhg0sk5NX11orcouwj6i1bMqZIz2mZTZB1Hcgy7C3oEVhAT+f6mbQ==}
+  /ts-morph@20.0.0:
+    resolution: {integrity: sha512-JVmEJy2Wow5n/84I3igthL9sudQ8qzjh/6i4tmYCm6IqYyKFlNbJZi7oBdjyqcWSWYRu3CtL0xbT6fS03ESZIg==}
     dependencies:
-      '@ts-morph/common': 0.20.0
+      '@ts-morph/common': 0.21.0
       code-block-writer: 12.0.0
     dev: true
 
@@ -4363,7 +4568,7 @@ packages:
     resolution: {integrity: sha512-7At1WUettjcSRHXCyYtTselblcHl9PJFFVKiCAy/bY97+BPZXSQ2wbq0P9s8tK2G7dFQfNnlJnPAiArVBVBsfA==}
     dev: false
 
-  /tsup@7.2.0(typescript@5.1.6):
+  /tsup@7.2.0(typescript@5.2.2):
     resolution: {integrity: sha512-vDHlczXbgUvY3rWvqFEbSqmC1L7woozbzngMqTtL2PGBODTtWlRwGDDawhvWzr5c1QjKe4OAKqJGfE1xeXUvtQ==}
     engines: {node: '>=16.14'}
     hasBin: true
@@ -4393,7 +4598,7 @@ packages:
       source-map: 0.8.0-beta.0
       sucrase: 3.32.0
       tree-kill: 1.2.2
-      typescript: 5.1.6
+      typescript: 5.2.2
     transitivePeerDependencies:
       - supports-color
       - ts-node
@@ -4447,8 +4652,8 @@ packages:
     resolution: {integrity: sha512-/aCDEGatGvZ2BIk+HmLf4ifCJFwvKFNb9/JeZPMulfgFracn9QFcAf5GO8B/mweUjSoblS5In0cWhqpfs/5PQA==}
     dev: false
 
-  /typescript@5.1.6:
-    resolution: {integrity: sha512-zaWCozRZ6DLEWAWFrVDz1H6FVXzUSfTy5FUMWsQlU8Ym5JP9eO4xkTIROFCQvhQf61z6O/G6ugw3SgAnvvm+HA==}
+  /typescript@5.2.2:
+    resolution: {integrity: sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w==}
     engines: {node: '>=14.17'}
     hasBin: true
     dev: true
@@ -4494,6 +4699,11 @@ packages:
       crypto-random-string: 4.0.0
     dev: false
 
+  /universalify@0.2.0:
+    resolution: {integrity: sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg==}
+    engines: {node: '>= 4.0.0'}
+    dev: true
+
   /universalify@1.0.0:
     resolution: {integrity: sha512-rb6X1W158d7pRQBg5gkR8uPaSfiids68LTJQYOtEUhoJUWBdaQHsuT/EUduxXYxcrt4r5PJ4fuHW1MHT6p0qug==}
     engines: {node: '>= 10.0.0'}
@@ -4533,6 +4743,13 @@ packages:
       xdg-basedir: 5.1.0
     dev: false
 
+  /url-parse@1.5.10:
+    resolution: {integrity: sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==}
+    dependencies:
+      querystringify: 2.2.0
+      requires-port: 1.0.0
+    dev: true
+
   /util-deprecate@1.0.2:
     resolution: {integrity: sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==}
     dev: false
@@ -4657,18 +4874,18 @@ packages:
       - universal-cookie
     dev: true
 
-  /vitest-mock-extended@1.2.1(typescript@5.1.6)(vitest@0.34.3):
-    resolution: {integrity: sha512-zRiSAR4d44S0XEWgfhnyYkU9Z2a7bo9FiEoh7Qe9qW/Qm+j0Uq9i8paOONpSDwzOe1fxwff8Au5PS5+uBZ06bw==}
+  /vitest-mock-extended@1.3.0(typescript@5.2.2)(vitest@0.34.3):
+    resolution: {integrity: sha512-qolbgansCq7huhmUUlHXOUYlejL86+jFkfyeoxGR9IWKhWcIjI3Ek2J9eTwIFfVzNkaTCpuJizEg9EqDJuuOkg==}
     peerDependencies:
       typescript: 3.x || 4.x || 5.x
       vitest: '>=0.31.1'
     dependencies:
-      ts-essentials: 9.3.2(typescript@5.1.6)
-      typescript: 5.1.6
-      vitest: 0.34.3
+      ts-essentials: 9.3.2(typescript@5.2.2)
+      typescript: 5.2.2
+      vitest: 0.34.3(jsdom@22.1.0)
     dev: true
 
-  /vitest@0.34.3:
+  /vitest@0.34.3(jsdom@22.1.0):
     resolution: {integrity: sha512-7+VA5Iw4S3USYk+qwPxHl8plCMhA5rtfwMjgoQXMT7rO5ldWcdsdo3U1QD289JgglGK4WeOzgoLTsGFu6VISyQ==}
     engines: {node: '>=v14.18.0'}
     hasBin: true
@@ -4712,6 +4929,7 @@ packages:
       cac: 6.7.14
       chai: 4.3.7
       debug: 4.3.4
+      jsdom: 22.1.0
       local-pkg: 0.4.3
       magic-string: 0.30.2
       pathe: 1.1.1
@@ -4766,6 +4984,13 @@ packages:
       '@vue/shared': 3.3.4
     dev: true
 
+  /w3c-xmlserializer@4.0.0:
+    resolution: {integrity: sha512-d+BFHzbiCx6zGfz0HyQ6Rg69w9k19nviJspaj4yNscGjrHu94sVP+aRm75yEbCh+r2/yR+7q6hux9LVtbuTGBw==}
+    engines: {node: '>=14'}
+    dependencies:
+      xml-name-validator: 4.0.0
+    dev: true
+
   /watchpack@2.4.0:
     resolution: {integrity: sha512-Lcvm7MGST/4fup+ifyKi2hjyIAwcdI4HRgtvTpIUxBRhB+RFtUh8XtDOxUfctVCnhVi+QQj49i91OyvzkJl6cg==}
     engines: {node: '>=10.13.0'}
@@ -4815,6 +5040,11 @@ packages:
     resolution: {integrity: sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==}
     dev: true
 
+  /webidl-conversions@7.0.0:
+    resolution: {integrity: sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==}
+    engines: {node: '>=12'}
+    dev: true
+
   /webpack-sources@3.2.3:
     resolution: {integrity: sha512-/DyMEOrDgLKKIG0fmvtz+4dUX/3Ghozwgm6iPp8KRhvn+eQf9+Q7GWxVNMk3+uCPWfdXYC4ExGBckIXdFEfH1w==}
     engines: {node: '>=10.13.0'}
@@ -4824,6 +5054,26 @@ packages:
     resolution: {integrity: sha512-kyDivFZ7ZM0BVOUteVbDFhlRt7Ah/CSPwJdi8hBpkK7QLumUqdLtVfm/PX/hkcnrvr0i77fO5+TjZ94Pe+C9iw==}
     dev: false
 
+  /whatwg-encoding@2.0.0:
+    resolution: {integrity: sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==}
+    engines: {node: '>=12'}
+    dependencies:
+      iconv-lite: 0.6.3
+    dev: true
+
+  /whatwg-mimetype@3.0.0:
+    resolution: {integrity: sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q==}
+    engines: {node: '>=12'}
+    dev: true
+
+  /whatwg-url@12.0.1:
+    resolution: {integrity: sha512-Ed/LrqB8EPlGxjS+TrsXcpUond1mhccS3pchLhzSgPCnTimUCKj3IZE75pAs5m6heB2U2TMerKFUXheyHY+VDQ==}
+    engines: {node: '>=14'}
+    dependencies:
+      tr46: 4.1.1
+      webidl-conversions: 7.0.0
+    dev: true
+
   /whatwg-url@7.1.0:
     resolution: {integrity: sha512-WUu7Rg1DroM7oQvGWfOiAK21n74Gg+T4elXEQYkOhtyLeWiJFoOGLXPKI/9gzIie9CtwVLm8wtw6YJdKyxSjeg==}
     dependencies:
@@ -4940,13 +5190,17 @@ packages:
         optional: true
       utf-8-validate:
         optional: true
-    dev: false
 
   /xdg-basedir@5.1.0:
     resolution: {integrity: sha512-GCPAHLvrIH13+c0SuacwvRYj2SxJXQ4kaVTT5xgL3kPrz56XxkF21IGhjSE1+W0aw7gpBWRGXLCPnPby6lSpmQ==}
     engines: {node: '>=12'}
     dev: false
 
+  /xml-name-validator@4.0.0:
+    resolution: {integrity: sha512-ICP2e+jsHvAj2E2lIHxa5tjXRlKDJo4IdvPvCXbXQGdzSfmSpNVyIKMvoZHjDY9DP0zV17iI85o90vRFXNccRw==}
+    engines: {node: '>=12'}
+    dev: true
+
   /xml2js@0.5.0:
     resolution: {integrity: sha512-drPFnkQJik/O+uPKpqSgr22mpuFHqKdbS835iAQrUC73L2F5WkboIRd63ai/2Yg6I1jzifPFKH2NTK+cfglkIA==}
     engines: {node: '>=4.0.0'}
@@ -4960,6 +5214,10 @@ packages:
     engines: {node: '>=4.0'}
     dev: false
 
+  /xmlchars@2.2.0:
+    resolution: {integrity: sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==}
+    dev: true
+
   /y18n@5.0.8:
     resolution: {integrity: sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==}
     engines: {node: '>=10'}

src/client/__tests__/createContentScriptUi.test.ts

@@ -0,0 +1,336 @@
+/** @vitest-environment jsdom */
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { ContentScriptContext, createContentScriptUi } from '..';
+import { createIsolatedElement } from '@webext-core/isolated-element';
+import { mock } from 'vitest-mock-extended';
+import { browser } from '../browser';
+
+vi.mock('webextension-polyfill', () =>
+  vi.importActual('../virtual-modules/fake-browser'),
+);
+
+vi.mock('@webext-core/isolated-element', async () => {
+  const { vi } = await import('vitest');
+  return {
+    createIsolatedElement: vi.fn(),
+  };
+});
+const createIsolatedElementMock = vi.mocked(createIsolatedElement);
+
+const testApp = (container: Element) => {
+  const app = document.createElement('div');
+  app.textContent = 'App';
+  container.append(app);
+};
+
+const createCtx = () => new ContentScriptContext('test');
+
+const fetch = vi.fn();
+
+describe('createContentScriptUi', () => {
+  beforeEach(() => {
+    document.body.innerHTML = `
+      <div id="parent">
+        <p id="one">one</p>
+        <p id="two">two</p>
+        <p id="three"></p>
+      </div>
+    `;
+
+    window.fetch = fetch;
+    fetch.mockResolvedValue({ text: () => Promise.resolve('') });
+
+    createIsolatedElementMock.mockImplementation(async (config) => {
+      const parentElement = document.createElement(config.name);
+      const isolatedElement = document.createElement('html');
+      parentElement.append(isolatedElement);
+
+      return {
+        isolatedElement,
+        parentElement: parentElement,
+        shadow: mock<ShadowRoot>({
+          querySelector: (selector: string) => {
+            if (selector === 'html') return isolatedElement;
+          },
+        }),
+      };
+    });
+  });
+
+  describe('css', () => {
+    it('should load the CSS for the current entrypoint when cssInjectionMode=ui', async () => {
+      fetch.mockResolvedValue({ text: () => Promise.resolve('body {}') });
+      const ctx = new ContentScriptContext('test', {
+        matches: [],
+        cssInjectionMode: 'ui',
+      });
+
+      await createContentScriptUi(ctx, {
+        name: 'test',
+        type: 'inline',
+        mount: testApp,
+      });
+
+      expect(fetch).toBeCalledTimes(1);
+      expect(fetch).toBeCalledWith(
+        `chrome-extension://${browser.runtime.id}/content-scripts/${__ENTRYPOINT__}.css`,
+      );
+      expect(createIsolatedElementMock).toBeCalledTimes(1);
+      expect(createIsolatedElementMock).toBeCalledWith(
+        expect.objectContaining({
+          css: {
+            textContent: 'body {}',
+          },
+        }),
+      );
+    });
+
+    it('should still load the UI when fetch fails to load CSS file when cssInjectionMode=ui', async () => {
+      const error = Error('Test fetch error');
+      fetch.mockRejectedValue(error);
+      const ctx = new ContentScriptContext('test', {
+        matches: [],
+        cssInjectionMode: 'ui',
+      });
+
+      await createContentScriptUi(ctx, {
+        name: 'test',
+        type: 'inline',
+        mount: testApp,
+      });
+
+      expect(fetch).toBeCalledTimes(1);
+      expect(fetch).toBeCalledWith(
+        `chrome-extension://${browser.runtime.id}/content-scripts/${__ENTRYPOINT__}.css`,
+      );
+      expect(createIsolatedElementMock).toBeCalledTimes(1);
+      expect(createIsolatedElementMock).toBeCalledWith(
+        expect.objectContaining({
+          css: {
+            textContent: '',
+          },
+        }),
+      );
+    });
+
+    it.each(['manifest', 'manual'] as const)(
+      'should not fetch CSS when cssInjectionMode=%s',
+      async (cssInjectionMode) => {
+        const ctx = new ContentScriptContext('test', {
+          matches: [],
+          cssInjectionMode,
+        });
+
+        await createContentScriptUi(ctx, {
+          name: 'test',
+          type: 'inline',
+          mount: testApp,
+        });
+
+        expect(fetch).not.toBeCalled();
+      },
+    );
+  });
+
+  describe('mount', () => {
+    describe('append option', () => {
+      it.each([undefined, 'last' as const])(
+        'should append the element as the last child to the anchor when append=%s',
+        async (append) => {
+          const ui = await createContentScriptUi(createCtx(), {
+            name: 'test-app',
+            type: 'inline',
+            anchor: '#parent',
+            append,
+            mount: testApp,
+          });
+          ui.mount();
+
+          expect(
+            document.querySelector('#parent > :nth-child(4)')?.tagName,
+          ).toEqual('TEST-APP');
+        },
+      );
+
+      it('should append the element as the first child to the anchor when append=first', async () => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test-app',
+          type: 'inline',
+          anchor: '#parent',
+          append: 'first',
+          mount: testApp,
+        });
+        ui.mount();
+
+        expect(
+          document.querySelector('#parent > :nth-child(1)')?.tagName,
+        ).toEqual('TEST-APP');
+      });
+
+      it('should append the element normally when append=first but there are no other children', async () => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test-app',
+          type: 'inline',
+          anchor: '#three',
+          append: 'first',
+          mount: testApp,
+        });
+        ui.mount();
+
+        expect(
+          document.querySelector('#three > :nth-child(1)')?.tagName,
+        ).toEqual('TEST-APP');
+      });
+
+      it('should replace the anchor with the element when append=replace', async () => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test-app',
+          type: 'inline',
+          anchor: '#two',
+          append: 'replace',
+          mount: testApp,
+        });
+        ui.mount();
+
+        expect(
+          document.querySelector('#parent > :nth-child(2)')?.tagName,
+        ).toEqual('TEST-APP');
+      });
+
+      it('should append the element after the anchor when append=before', async () => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test-app',
+          type: 'inline',
+          anchor: '#two',
+          append: 'before',
+          mount: testApp,
+        });
+        ui.mount();
+
+        expect(
+          document.querySelector('#parent > :nth-child(2)')?.tagName,
+        ).toEqual('TEST-APP');
+      });
+
+      it('should append the element after the anchor when append=after', async () => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test-app',
+          type: 'inline',
+          anchor: '#two',
+          append: 'after',
+          mount: testApp,
+        });
+        ui.mount();
+
+        expect(
+          document.querySelector('#parent > :nth-child(3)')?.tagName,
+        ).toEqual('TEST-APP');
+      });
+
+      it('should apply a custom function', async () => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test-app',
+          type: 'inline',
+          anchor: '#three',
+          append: (anchor, ui) => anchor.replaceWith(ui),
+          mount: testApp,
+        });
+        ui.mount();
+
+        expect(
+          document.querySelector('#parent > :nth-child(3)')?.tagName,
+        ).toEqual('TEST-APP');
+      });
+    });
+
+    it('should default the anchor to the body when unset', async () => {
+      const ui = await createContentScriptUi(createCtx(), {
+        name: 'test-app',
+        type: 'inline',
+        mount: testApp,
+      });
+      ui.mount();
+
+      expect(document.querySelector('body > :nth-child(2)')?.tagName).toEqual(
+        'TEST-APP',
+      );
+    });
+
+    it.each(['#four', () => document.querySelector('#four')])(
+      "should throw an error if the anchor doesn't exist",
+      async (anchor) => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test',
+          type: 'inline',
+          anchor,
+          mount: testApp,
+        });
+
+        expect(ui.mount).toThrow(
+          'Failed to mount content script ui: could not find anchor element',
+        );
+      },
+    );
+  });
+
+  describe('remove', () => {
+    it("should not fail if the ui hasn't been mounted", async () => {
+      const ui = await createContentScriptUi(createCtx(), {
+        name: 'test-app',
+        type: 'inline',
+        mount: testApp,
+      });
+      ui.remove();
+    });
+
+    it('should automatically remove the UI when the context is invalidated', async () => {
+      const ctx = createCtx();
+      const ui = await createContentScriptUi(ctx, {
+        name: 'test-app',
+        type: 'inline',
+        mount: testApp,
+      });
+      ui.mount();
+
+      expect(document.querySelector('test-app')).toBeDefined();
+
+      ctx.abort();
+      expect(document.querySelector('test-app')).toBeNull();
+    });
+  });
+
+  describe('type', () => {
+    it.each(['inline', 'overlay', 'modal'] as const)(
+      'should render type=%s',
+      async (type) => {
+        const ui = await createContentScriptUi(createCtx(), {
+          name: 'test-app',
+          type,
+          mount: testApp,
+        });
+        ui.mount();
+
+        expect(document.querySelector('test-app')).toBeDefined();
+      },
+    );
+  });
+
+  describe('anchor', () => {
+    it.each([
+      () => '#two',
+      () => () => '#two',
+      () => document.querySelector('#two'),
+      () => () => document.querySelector('#two'),
+    ])('should render anchor=%s', async (getAnchor) => {
+      const ui = await createContentScriptUi(createCtx(), {
+        name: 'test-app',
+        type: 'inline',
+        anchor: getAnchor(),
+        mount: testApp,
+      });
+      ui.mount();
+
+      expect(document.querySelector('test-app')).toBeDefined();
+    });
+  });
+});

src/client/createContentScriptUi.ts

@@ -0,0 +1,298 @@
+import { createIsolatedElement } from '@webext-core/isolated-element';
+import { browser } from './browser';
+import { logger } from './utils/logger';
+import { ContentScriptContext } from '.';
+
+/**
+ * Utility for mounting content script UI's with isolated styles. Automatically removed from the DOM
+ * when the content script's context is invalidated.
+ *
+ * See <https://wxt.dev/entrypoints/content-scripts.html#ui> for full documentation.
+ *
+ * @example
+ * // entrypoints/example-ui.content/index.ts
+ * import "./style.css"
+ *
+ * export default defineContentScript({
+ *   matches: ["*://*.google.com/*"],
+ *   cssInjectionMode: "ui",
+ *
+ *   async main(ctx) {
+ *     const ui = await createContentScriptUi(ctx, {
+ *       name: "example-overlay",
+ *       type: "modal",
+ *       mount(container) {
+ *         const app = document.createElement("div");
+ *         app.textContent = "Content Script UI";
+ *         container.append(app);
+ *       }
+ *     })
+ *     ui.mount();
+ *   }
+ * })
+ */
+export async function createContentScriptUi<T>(
+  ctx: ContentScriptContext,
+  options: ContentScriptUiOptions<T>,
+): Promise<ContentScriptUi<T>> {
+  const css = [options.css ?? ''];
+  if (ctx.options?.cssInjectionMode === 'ui') {
+    css.push(await loadCss());
+  }
+
+  const {
+    isolatedElement: uiContainer,
+    parentElement: shadowHost,
+    shadow,
+  } = await createIsolatedElement({
+    name: options.name,
+    css: {
+      textContent: css.join('\n').trim(),
+    },
+    mode: 'open',
+  });
+
+  const getAnchor = (): Element | undefined => {
+    if (options.anchor == null) return document.body;
+
+    let resolved =
+      typeof options.anchor === 'function' ? options.anchor() : options.anchor;
+    if (typeof resolved === 'string')
+      return document.querySelector<Element>(resolved) ?? undefined;
+    return resolved ?? undefined;
+  };
+
+  let mounted: T;
+
+  const mount = () => {
+    const anchor = getAnchor();
+    if (anchor == null)
+      throw Error(
+        'Failed to mount content script ui: could not find anchor element',
+      );
+
+    // Mount UI inside shadow root
+    mounted = options.mount(uiContainer);
+
+    // Add shadow root element to DOM
+    switch (options.append) {
+      case undefined:
+      case 'last':
+        anchor.append(shadowHost);
+        break;
+      case 'first':
+        if (anchor.firstChild) {
+          anchor.insertBefore(shadowHost, anchor.firstChild);
+        } else {
+          anchor.append(shadowHost);
+        }
+        break;
+      case 'replace':
+        anchor.replaceWith(shadowHost);
+        break;
+      case 'after':
+        anchor.replaceWith(anchor, shadowHost);
+        break;
+      case 'before':
+        anchor.replaceWith(shadowHost, anchor);
+        break;
+      default:
+        options.append(anchor, shadowHost);
+        break;
+    }
+
+    // Apply types
+    if (options.type !== 'inline') {
+      if (options.zIndex != null)
+        shadowHost.style.zIndex = String(options.zIndex);
+
+      shadowHost.style.overflow = 'visible';
+      shadowHost.style.position = 'relative';
+      shadowHost.style.width = '0';
+      shadowHost.style.height = '0';
+      shadowHost.style.display = 'block';
+
+      const html = shadow.querySelector('html')!;
+      // HTML doesn't exist in tests
+      if (options.type === 'overlay') {
+        html.style.position = 'absolute';
+        if (options.alignment?.startsWith('bottom-')) html.style.bottom = '0';
+        else html.style.top = '0';
+
+        if (options.alignment?.endsWith('-right')) html.style.right = '0';
+        else html.style.left = '0';
+      } else {
+        html.style.position = 'fixed';
+        html.style.top = '0';
+        html.style.bottom = '0';
+        html.style.left = '0';
+        html.style.right = '0';
+      }
+    }
+  };
+
+  const remove = () => {
+    // Detatch shadow root from DOM
+    shadowHost.remove();
+    // Cleanup mounted state
+    options.onRemove?.(mounted);
+    // Remove children from uiContainer
+    while (uiContainer.lastChild)
+      uiContainer.removeChild(uiContainer.lastChild);
+  };
+
+  ctx.onInvalidated(remove);
+
+  return {
+    shadow,
+    shadowHost,
+    uiContainer,
+    mount,
+    remove,
+    mounted: mounted!,
+  };
+}
+
+/**
+ * Load the CSS for the current entrypoint.
+ */
+async function loadCss(): Promise<string> {
+  const url = browser.runtime.getURL(`/content-scripts/${__ENTRYPOINT__}.css`);
+  try {
+    const res = await fetch(url);
+    const css = await res.text();
+
+    // Replace :root selectors with :host since we're in a shadow root
+    return css.replaceAll(':root', ':host');
+  } catch (err) {
+    logger.warn(
+      `Failed to load styles @ ${url}. Did you forget to import the stylesheet in your entrypoint?`,
+      err,
+    );
+    return '';
+  }
+}
+
+export interface ContentScriptUi<T> {
+  /**
+   * The `HTMLElement` hosting the shadow root used to isolate the UI's styles. This is the element
+   * that get's added to the DOM. This element's style is not isolated from the webpage.
+   */
+  shadowHost: HTMLElement;
+  /**
+   * The container element inside the `ShadowRoot` whose styles are isolated. The UI is mounted
+   * inside this `HTMLElement`.
+   */
+  uiContainer: HTMLElement;
+  /**
+   * The shadow root performing the isolation.
+   */
+  shadow: ShadowRoot;
+  /**
+   * Custom data returned from the `options.mount` function.
+   */
+  mounted: T;
+  /**
+   * Function that mounts or remounts the UI on the page.
+   */
+  mount: () => void;
+  /**
+   * Function that removes the UI from the webpage.
+   */
+  remove: () => void;
+}
+
+interface BaseContentScriptUiOptions<T> {
+  /**
+   * The name of the custom component used to host the ShadowRoot. Must be kebab-case.
+   */
+  name: string;
+  /**
+   * In combination with `anchor`, decide how to add the UI to the DOM.
+   *
+   * - `"last"` (default) - Add the UI as the last child of the `anchor` element
+   * - `"first"` - Add the UI as the last child of the `anchor` element
+   * - `"replace"` - Replace the `anchor` element with the UI.
+   * - `"before"` - Add the UI as the sibling before the `anchor` element
+   * - `"after"` - Add the UI as the sibling after the `anchor` element
+   * - `(anchor, ui) => void` - Customizable function that let's you add the UI to the DOM
+   */
+  append?: ContentScriptAppendMode | ((anchor: Element, ui: Element) => void);
+  /**
+   * A CSS selector, element, or function that returns one of the two. Along with `append`, the
+   * `anchor` dictates where in the page the UI will be added.
+   */
+  anchor?:
+    | string
+    | Element
+    | null
+    | undefined
+    | (() => string | Element | null | undefined);
+  /**
+   * Callback executed when mounting the UI. This function should create and append the UI to the
+   * `container` element. It is called every time `ui.mount()` is called
+   *
+   * Optionally return a value that can be accessed at `ui.mounted` or in the `onRemove` callback.
+   */
+  mount: (container: Element) => T;
+  /**
+   * Callback called when the UI is removed from the webpage. Use to cleanup your UI, like
+   * unmounting your vue or react apps.
+   */
+  onRemove?: (mounted: T) => void;
+  /**
+   * Custom CSS text to apply to the UI. If your content script imports/generates CSS and you've
+   * set `cssInjectionMode: "ui"`, the imported CSS will be included automatically. You do not need
+   * to pass those styles in here. This is for any additional styles not in the imported CSS.
+   *
+   * See <https://wxt.dev/entrypoints/content-scripts.html#ui> for more info.
+   */
+  css?: string;
+}
+
+export type OverlayContentScriptUiOptions<T> = BaseContentScriptUiOptions<T> & {
+  type: 'overlay';
+  /**
+   * When using `type: "overlay"`, the mounted element is 0px by 0px in size. Alignment specifies
+   * which corner is aligned with that 0x0 pixel space.
+   *
+   * @default "top-left"
+   */
+  alignment?: ContentScriptUiOverlayAlignment;
+  /**
+   * The `z-index` used on the `shadowHost`. Set to a positive number to show your UI over website
+   * content.
+   */
+  zIndex?: number;
+};
+
+export type ModalContentScriptUiOptions<T> = BaseContentScriptUiOptions<T> & {
+  type: 'modal';
+  /**
+   * The `z-index` used on the `shadowHost`. Set to a positive number to show your UI over website
+   * content.
+   */
+  zIndex?: number;
+};
+
+export type InlineContentScriptUiOptions<T> = BaseContentScriptUiOptions<T> & {
+  type: 'inline';
+};
+
+export type ContentScriptUiOverlayAlignment =
+  | 'top-left'
+  | 'top-right'
+  | 'bottom-left'
+  | 'bottom-right';
+
+export type ContentScriptAppendMode =
+  | 'last'
+  | 'first'
+  | 'replace'
+  | 'before'
+  | 'after';
+
+export type ContentScriptUiOptions<T> =
+  | OverlayContentScriptUiOptions<T>
+  | ModalContentScriptUiOptions<T>
+  | InlineContentScriptUiOptions<T>;

src/client/index.ts

@@ -1,4 +1,4 @@
 export * from './defineContentScript';
 export * from './defineBackground';
-export * from './mountContentScriptUi';
+export * from './createContentScriptUi';
 export * from './utils/ContentScriptContext';

src/client/mountContentScriptUi.ts

@@ -1,3 +0,0 @@
-export function mountContentScriptUi() {
-  throw Error('Not implemented: mountContentScriptUi');
-}

src/client/utils/ContentScriptContext.ts

@@ -1,3 +1,4 @@
+import { ContentScriptDefinition } from '../../core/types';
 import { browser } from '../browser';
 import { logger } from './logger';
 
@@ -13,7 +14,10 @@ export class ContentScriptContext extends AbortController {
 
   #isTopFrame = window.self === window.top;
 
-  constructor(private readonly contentScriptName: string) {
+  constructor(
+    private readonly contentScriptName: string,
+    public readonly options?: Omit<ContentScriptDefinition, 'main'>,
+  ) {
     super();
 
     if (this.#isTopFrame) {
@@ -157,10 +161,13 @@ export class ContentScriptContext extends AbortController {
 
   #stopOldScripts() {
     // Use postMessage so it get's sent to all the frames of the page.
-    window.postMessage({
-      event: ContentScriptContext.SCRIPT_STARTED_MESSAGE_TYPE,
-      contentScriptName: this.contentScriptName,
-    });
+    window.postMessage(
+      {
+        event: ContentScriptContext.SCRIPT_STARTED_MESSAGE_TYPE,
+        contentScriptName: this.contentScriptName,
+      },
+      '*',
+    );
   }
 
   #listenForNewerScripts() {

src/client/virtual-modules/content-script-entrypoint.ts

@@ -4,9 +4,10 @@ import { ContentScriptContext } from '../utils/ContentScriptContext';
 
 (async () => {
   try {
-    const ctx = new ContentScriptContext(__ENTRYPOINT__);
+    const { main, ...options } = definition;
+    const ctx = new ContentScriptContext(__ENTRYPOINT__, options);
 
-    await definition.main(ctx);
+    await main(ctx);
   } catch (err) {
     logger.error('The content script crashed on startup!', err);
   }

src/core/build/buildEntrypoints.ts

@@ -84,10 +84,15 @@ async function buildSingleEntrypoint(
             config.outDir,
             '.js',
           ),
-          // Output content script CSS to assets/ with a hash to prevent conflicts. Defaults to
-          // "[name].[ext]" in lib mode, which usually results in "style.css". That means multiple
-          // content scripts with styles would overwrite each other if it weren't changed below.
-          assetFileNames: `assets/${entrypoint.name}.[ext]`,
+          // Output content script CSS to `content-scripts/`, but all other scripts are written to
+          // `assets/`.
+          assetFileNames: ({ name }) => {
+            if (entrypoint.type === 'content-script' && name?.endsWith('css')) {
+              return `content-scripts/${entrypoint.name}.[ext]`;
+            } else {
+              return `assets/${entrypoint.name}.[ext]`;
+            }
+          },
         },
       },
     },

src/core/build/findEntrypoints.ts

@@ -17,7 +17,10 @@ import { parseHTML } from 'linkedom';
 import JSON5 from 'json5';
 import { importEntrypointFile } from '../utils/importEntrypointFile';
 import glob from 'fast-glob';
-import { getEntrypointName } from '../utils/entrypoints';
+import {
+  getEntrypointName,
+  resolvePerBrowserOption,
+} from '../utils/entrypoints';
 import { VIRTUAL_NOOP_BACKGROUND_MODULE_ID } from '../vite-plugins/noopBackground';
 import { CSS_EXTENSIONS_PATTERN } from '../utils/paths';
 
@@ -300,7 +303,11 @@ async function getBackgroundEntrypoint(
     name: 'background',
     inputPath: path,
     outputDir: config.outDir,
-    options: options,
+    options: {
+      ...options,
+      type: resolvePerBrowserOption(options.type, config.browser),
+      persistent: resolvePerBrowserOption(options.persistent, config.browser),
+    },
   };
 }
 
@@ -349,14 +356,14 @@ const PATH_GLOB_TO_TYPE_MAP: Record<string, Entrypoint['type'] | 'ignored'> = {
   'devtools.html': 'devtools',
   'devtools/index.html': 'devtools',
 
-  'background.ts': 'background',
-  'background/index.ts': 'background',
+  'background.[jt]s': 'background',
+  'background/index.[jt]s': 'background',
   [VIRTUAL_NOOP_BACKGROUND_MODULE_ID]: 'background',
 
-  'content.ts?(x)': 'content-script',
-  'content/index.ts?(x)': 'content-script',
-  '*.content.ts?(x)': 'content-script',
-  '*.content/index.ts?(x)': 'content-script',
+  'content.[jt]s?(x)': 'content-script',
+  'content/index.[jt]s?(x)': 'content-script',
+  '*.content.[jt]s?(x)': 'content-script',
+  '*.content/index.[jt]s?(x)': 'content-script',
   [`content.${CSS_EXTENSIONS_PATTERN}`]: 'content-script-style',
   [`*.content.${CSS_EXTENSIONS_PATTERN}`]: 'content-script-style',
   [`content/index.${CSS_EXTENSIONS_PATTERN}`]: 'content-script-style',
@@ -370,7 +377,7 @@ const PATH_GLOB_TO_TYPE_MAP: Record<string, Entrypoint['type'] | 'ignored'> = {
 
   '*.html': 'unlisted-page',
   '*/index.html': 'unlisted-page',
-  '*.ts': 'unlisted-script',
+  '*.[jt]s': 'unlisted-script',
   '*/index.ts': 'unlisted-script',
   [`*.${CSS_EXTENSIONS_PATTERN}`]: 'unlisted-style',
   [`*/index.${CSS_EXTENSIONS_PATTERN}`]: 'unlisted-style',

src/core/build/generateTypesDir.ts

@@ -213,14 +213,14 @@ async function writeTsConfigFile(
     "lib": ["DOM", "WebWorker"],
     "skipLibCheck": true,
     "paths": {
-      "@@": ["${rootPath}"],
-      "@@/*": ["${rootPath}/*"],
-      "~~": ["${rootPath}"],
-      "~~/*": ["${rootPath}/*"],
       "@": ["${srcPath}"],
       "@/*": ["${srcPath}/*"],
       "~": ["${srcPath}"],
-      "~/*": ["${srcPath}/*"]
+      "~/*": ["${srcPath}/*"],
+      "@@": ["${rootPath}"],
+      "@@/*": ["${rootPath}/*"],
+      "~~": ["${rootPath}"],
+      "~~/*": ["${rootPath}/*"]
     }
   },
   "include": [

src/core/server.ts

@@ -6,8 +6,14 @@ import {
 } from './types';
 import * as vite from 'vite';
 import { Scripting } from 'webextension-polyfill';
-import { getEntrypointBundlePath } from './utils/entrypoints';
-import { getContentScriptCssFiles } from './utils/manifest';
+import {
+  getEntrypointBundlePath,
+  resolvePerBrowserOption,
+} from './utils/entrypoints';
+import {
+  getContentScriptCssFiles,
+  getContentScriptsCssMap,
+} from './utils/manifest';
 import { buildInternal } from './build';
 import { createExtensionRunner } from './runners';
 
@@ -99,12 +105,22 @@ export function reloadContentScripts(
       if (Array.isArray(entry) || entry.type !== 'content-script') return;
 
       const js = [getEntrypointBundlePath(entry, config.outDir, '.js')];
-      const css = getContentScriptCssFiles([entry], server.currentOutput);
-
-      const { include: _1, exclude: _2, ...options } = entry.options;
+      const cssMap = getContentScriptsCssMap(server.currentOutput, [entry]);
+      const css = getContentScriptCssFiles([entry], cssMap);
 
       server.reloadContentScript({
-        ...options,
+        allFrames: resolvePerBrowserOption(
+          entry.options.allFrames,
+          config.browser,
+        ),
+        excludeMatches: resolvePerBrowserOption(
+          entry.options.excludeMatches,
+          config.browser,
+        ),
+        matches: resolvePerBrowserOption(entry.options.matches, config.browser),
+        runAt: resolvePerBrowserOption(entry.options.runAt, config.browser),
+        // @ts-expect-error: Chrome accepts this, not typed in webextension-polyfill (https://developer.chrome.com/docs/extensions/reference/scripting/#type-RegisteredContentScript)
+        world: resolvePerBrowserOption(entry.options.world, config.browser),
         js,
         css,
       });

src/core/types/external.ts

@@ -365,47 +365,61 @@ export type Entrypoint =
 export type OnContentScriptStopped = (cb: () => void) => void;
 
 export interface ContentScriptDefinition extends ExcludableEntrypoint {
-  matches: Manifest.ContentScript['matches'];
+  matches: PerBrowserOption<Manifest.ContentScript['matches']>;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default "documentIdle"
    */
-  runAt?: Manifest.ContentScript['run_at'];
+  runAt?: PerBrowserOption<Manifest.ContentScript['run_at']>;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default false
    */
-  matchAboutBlank?: Manifest.ContentScript['match_about_blank'];
+  matchAboutBlank?: PerBrowserOption<
+    Manifest.ContentScript['match_about_blank']
+  >;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default []
    */
-  excludeMatches?: Manifest.ContentScript['exclude_matches'];
+  excludeMatches?: PerBrowserOption<Manifest.ContentScript['exclude_matches']>;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default []
    */
-  includeGlobs?: Manifest.ContentScript['include_globs'];
+  includeGlobs?: PerBrowserOption<Manifest.ContentScript['include_globs']>;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default []
    */
-  excludeGlobs?: Manifest.ContentScript['exclude_globs'];
+  excludeGlobs?: PerBrowserOption<Manifest.ContentScript['exclude_globs']>;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default false
    */
-  allFrames?: Manifest.ContentScript['all_frames'];
+  allFrames?: PerBrowserOption<Manifest.ContentScript['all_frames']>;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default false
    */
-  matchOriginAsFallback?: boolean;
+  matchOriginAsFallback?: PerBrowserOption<boolean>;
   /**
    * See https://developer.chrome.com/docs/extensions/mv3/content_scripts/
    * @default "ISOLATED"
    */
-  world?: 'ISOLATED' | 'MAIN';
+  world?: PerBrowserOption<'ISOLATED' | 'MAIN'>;
+  /**
+   * Customize how imported/generated styles are injected with the content script. Regardless of the
+   * mode selected, CSS will always be built and included in the output directory.
+   *
+   * - `"manifest"` - Include the CSS in the manifest, under the content script's `css` array.
+   * - `"manual"` - Exclude the CSS from the manifest. You are responsible for manually loading it
+   *   onto the page. Use `browser.runtime.getURL("content-scripts/<name>.css")` to get the file's
+   *   URL
+   *
+   * @default "manifest"
+   */
+  cssInjectionMode?: PerBrowserOption<'manifest' | 'manual' | 'ui'>;
   /**
    * Main function executed when the content script is loaded.
    */
@@ -413,10 +427,13 @@ export interface ContentScriptDefinition extends ExcludableEntrypoint {
 }
 
 export interface BackgroundScriptDefintition extends ExcludableEntrypoint {
-  type?: 'module';
+  type?: PerBrowserOption<'module'>;
+  persistent?: PerBrowserOption<boolean>;
   main(): void;
 }
 
+export type PerBrowserOption<T> = T | { [browser: TargetBrowser]: T };
+
 export interface ExcludableEntrypoint {
   /**
    * List of target browsers to include this entrypoint in. Defaults to being included in all

src/core/types/internal.ts

@@ -8,6 +8,7 @@ import {
   UserManifest,
   ExtensionRunnerConfig,
   ConfigEnv,
+  UserConfig,
 } from './external';
 import { UnimportOptions } from 'unimport';
 import { ResolvedConfig } from 'c12';
@@ -48,6 +49,7 @@ export interface InternalConfig {
     enabled: boolean;
     template: NonNullable<PluginVisualizerOptions['template']>;
   };
+  userConfigMetadata: Omit<ResolvedConfig<UserConfig>, 'config'>;
 }
 
 export type EntrypointGroup = Entrypoint | Entrypoint[];

src/core/utils/__tests__/entrypoints.test.ts

@@ -1,5 +1,9 @@
 import { describe, it, expect } from 'vitest';
-import { getEntrypointName, getEntrypointOutputFile } from '../entrypoints';
+import {
+  getEntrypointName,
+  getEntrypointOutputFile,
+  resolvePerBrowserOption,
+} from '../entrypoints';
 import { Entrypoint } from '../../types';
 import { resolve } from 'path';
 
@@ -49,4 +53,25 @@ describe('Entrypoint Utils', () => {
       expect(actual).toBe(expected);
     });
   });
+
+  describe('resolvePerBrowserOption', () => {
+    it('should return the value directly', () => {
+      expect(resolvePerBrowserOption('some-string', '')).toEqual('some-string');
+      expect(resolvePerBrowserOption(false, '')).toEqual(false);
+      expect(resolvePerBrowserOption([1], '')).toEqual([1]);
+      expect(resolvePerBrowserOption(['string'], '')).toEqual(['string']);
+    });
+
+    it('should return the value for the specific browser', () => {
+      expect(resolvePerBrowserOption({ a: 'one', b: 'two' }, 'a')).toEqual(
+        'one',
+      );
+      expect(resolvePerBrowserOption({ c: ['one'], d: ['two'] }, 'c')).toEqual([
+        'one',
+      ]);
+      expect(resolvePerBrowserOption({ c: false, d: true }, 'e')).toEqual(
+        undefined,
+      );
+    });
+  });
 });

src/core/utils/content-scripts.ts

@@ -1,5 +1,6 @@
 import { Manifest } from 'webextension-polyfill';
-import { ContentScriptEntrypoint } from '../types';
+import { ContentScriptEntrypoint, InternalConfig } from '../types';
+import { resolvePerBrowserOption } from './entrypoints';
 
 /**
  * Returns a unique and consistent string hash based on a content scripts options.
@@ -35,18 +36,34 @@ export function hashContentScriptOptions(
 
 export function mapWxtOptionsToContentScript(
   options: ContentScriptEntrypoint['options'],
+  config: InternalConfig,
 ): Omit<Manifest.ContentScript, 'js' | 'css'> {
   return {
-    matches: options.matches,
-    all_frames: options.allFrames,
-    match_about_blank: options.matchAboutBlank,
-    exclude_globs: options.excludeGlobs,
-    exclude_matches: options.excludeMatches,
-    include_globs: options.includeGlobs,
-    run_at: options.runAt,
+    matches: resolvePerBrowserOption(options.matches, config.browser),
+    all_frames: resolvePerBrowserOption(options.allFrames, config.browser),
+    match_about_blank: resolvePerBrowserOption(
+      options.matchAboutBlank,
+      config.browser,
+    ),
+    exclude_globs: resolvePerBrowserOption(
+      options.excludeGlobs,
+      config.browser,
+    ),
+    exclude_matches: resolvePerBrowserOption(
+      options.excludeMatches,
+      config.browser,
+    ),
+    include_globs: resolvePerBrowserOption(
+      options.includeGlobs,
+      config.browser,
+    ),
+    run_at: resolvePerBrowserOption(options.runAt, config.browser),
 
     // @ts-expect-error: untyped chrome options
-    match_origin_as_fallback: options.matchOriginAsFallback,
+    match_origin_as_fallback: resolvePerBrowserOption(
+      options.matchOriginAsFallback,
+      config.browser,
+    ),
     world: options.world,
   };
 }

src/core/utils/entrypoints.ts

@@ -1,4 +1,4 @@
-import { Entrypoint } from '../types';
+import { Entrypoint, PerBrowserOption, TargetBrowser } from '../types';
 import path, { relative, resolve } from 'node:path';
 import { normalizePath } from './paths';
 
@@ -34,3 +34,15 @@ export function getEntrypointBundlePath(
     relative(outDir, getEntrypointOutputFile(entrypoint, ext)),
   );
 }
+
+/**
+ * Given an entrypoint option, resolve it's value based on a target browser.
+ */
+export function resolvePerBrowserOption<T>(
+  option: PerBrowserOption<T>,
+  browser: TargetBrowser,
+): T {
+  if (typeof option === 'object' && !Array.isArray(option))
+    return (option as any)[browser];
+  return option;
+}

src/core/utils/getInternalConfig.ts

@@ -30,13 +30,15 @@ export async function getInternalConfig(
   // Load user config
 
   let userConfig: UserConfig = {};
+  let userConfigMetadata: InternalConfig['userConfigMetadata'] | undefined;
   if (inlineConfig.configFile !== false) {
-    const loaded = await loadConfig<UserConfig>({
+    const { config: loadedConfig, ...metadata } = await loadConfig<UserConfig>({
       name: 'wxt',
       cwd: inlineConfig.root ?? process.cwd(),
       rcFile: false,
     });
-    userConfig = loaded.config ?? {};
+    userConfig = loadedConfig ?? {};
+    userConfigMetadata = metadata;
   }
 
   // Merge it into the inline config
@@ -51,7 +53,8 @@ export async function getInternalConfig(
 
   const browser = mergedConfig.browser ?? 'chrome';
   const manifestVersion =
-    mergedConfig.manifestVersion ?? (browser == 'firefox' ? 2 : 3);
+    mergedConfig.manifestVersion ??
+    (browser === 'firefox' || browser === 'safari' ? 2 : 3);
   const mode =
     mergedConfig.mode ?? (command === 'build' ? 'production' : 'development');
   const env: ConfigEnv = { browser, command, manifestVersion, mode };
@@ -109,6 +112,7 @@ export async function getInternalConfig(
       enabled: mergedConfig.analysis?.enabled ?? false,
       template: mergedConfig.analysis?.template ?? 'treemap',
     },
+    userConfigMetadata: userConfigMetadata ?? {},
   };
 
   finalConfig.vite = (env) =>

src/core/utils/importEntrypointFile.ts

@@ -56,7 +56,8 @@ export async function importEntrypointFile<T>(
         'node_modules/wxt/dist/virtual-modules/fake-browser.js',
       ),
     },
-    extensions: ['.ts', '.tsx', '.cjs', '.js', '.mjs'],
+    // List of extensions to transform with esbuild
+    extensions: ['.ts', '.cts', '.mts', '.tsx', '.js', '.cjs', '.mjs', '.jsx'],
     transform(opts) {
       const isEntrypoint = opts.filename === normalPath;
       return transformSync(

src/core/utils/manifest.ts

@@ -10,7 +10,10 @@ import {
 } from '../types';
 import fs from 'fs-extra';
 import { resolve } from 'path';
-import { getEntrypointBundlePath } from './entrypoints';
+import {
+  getEntrypointBundlePath,
+  resolvePerBrowserOption,
+} from './entrypoints';
 import { ContentSecurityPolicy } from './ContentSecurityPolicy';
 import {
   hashContentScriptOptions,
@@ -20,6 +23,7 @@ import { getPackageJson } from './package';
 import { normalizePath } from './paths';
 import { writeFileIfDifferent } from './fs';
 import { produce } from 'immer';
+import * as vite from 'vite';
 
 /**
  * Writes the manifest to the output directory and the build output.
@@ -56,41 +60,44 @@ export async function generateMainfest(
 ): Promise<Manifest.WebExtensionManifest> {
   const pkg = await getPackageJson(config);
 
-  const manifest: Manifest.WebExtensionManifest = Object.assign(
-    {
-      manifest_version: config.manifestVersion,
-      name: pkg?.name,
-      description: pkg?.description,
-      version: pkg?.version && simplifyVersion(pkg.version),
-      // Only add the version name to chromium and if the user hasn't specified a custom version.
-      version_name:
-        config.browser !== 'firefox' && !config.manifest.version
-          ? pkg?.version
-          : undefined,
-      short_name: pkg?.shortName,
-      icons: discoverIcons(buildOutput),
-    },
-    config.manifest,
-  );
+  const baseManifest: Manifest.WebExtensionManifest = {
+    manifest_version: config.manifestVersion,
+    name: pkg?.name,
+    description: pkg?.description,
+    version: pkg?.version && simplifyVersion(pkg.version),
+    // Only add the version name to chromium and if the user hasn't specified a custom version.
+    version_name:
+      config.browser !== 'firefox' && !config.manifest.version
+        ? pkg?.version
+        : undefined,
+    short_name: pkg?.shortName,
+    icons: discoverIcons(buildOutput),
+  };
+  const userManifest = config.manifest;
+
+  const manifest = vite.mergeConfig(
+    baseManifest,
+    userManifest,
+  ) as Manifest.WebExtensionManifest;
 
   addEntrypoints(manifest, entrypoints, buildOutput, config);
 
   if (config.command === 'serve') addDevModeCsp(manifest, config);
   if (config.command === 'serve') addDevModePermissions(manifest, config);
 
-  // TODO: transform manifest here.
+  const finalManifest = produce(manifest, config.transformManifest);
 
-  if (manifest.name == null)
+  if (finalManifest.name == null)
     throw Error(
       "Manifest 'name' is missing. Either:\n1. Set the name in your <rootDir>/package.json\n2. Set a name via the manifest option in your wxt.config.ts",
     );
-  if (manifest.version == null) {
+  if (finalManifest.version == null) {
     throw Error(
       "Manifest 'version' is missing. Either:\n1. Add a version in your <rootDir>/package.json\n2. Pass the version via the manifest option in your wxt.config.ts",
     );
   }
 
-  return produce(manifest, config.transformManifest);
+  return finalManifest;
 }
 
 /**
@@ -284,12 +291,18 @@ function addEntrypoints(
   }
 
   if (contentScripts?.length) {
+    const cssMap = getContentScriptsCssMap(buildOutput, contentScripts);
+
     // Don't add content scripts to the manifest in dev mode for MV3 - they're managed and reloaded
     // at runtime
     if (config.command === 'serve' && config.manifestVersion === 3) {
       const hostPermissions = new Set<string>(manifest.host_permissions ?? []);
       contentScripts.forEach((script) => {
-        script.options.matches.forEach((matchPattern) => {
+        const matches = resolvePerBrowserOption(
+          script.options.matches,
+          config.browser,
+        );
+        matches.forEach((matchPattern) => {
           hostPermissions.add(matchPattern);
         });
       });
@@ -306,10 +319,10 @@ function addEntrypoints(
 
       const newContentScripts = Array.from(hashToEntrypointsMap.entries()).map(
         ([, scripts]) => ({
-          ...mapWxtOptionsToContentScript(scripts[0].options),
+          ...mapWxtOptionsToContentScript(scripts[0].options, config),
           // TOOD: Sorting css and js arrays here so we get consistent test results... but we
           // shouldn't have to. Where is the inconsistency coming from?
-          css: getContentScriptCssFiles(scripts, buildOutput)?.sort(),
+          css: getContentScriptCssFiles(scripts, cssMap)?.sort(),
           js: scripts
             .map((entry) =>
               getEntrypointBundlePath(entry, config.outDir, '.js'),
@@ -322,6 +335,16 @@ function addEntrypoints(
         manifest.content_scripts.push(...newContentScripts);
       }
     }
+
+    const contentScriptCssResources = getContentScriptCssWebAccessibleResources(
+      config,
+      contentScripts,
+      cssMap,
+    );
+    if (contentScriptCssResources.length > 0) {
+      manifest.web_accessible_resources ??= [];
+      manifest.web_accessible_resources.push(...contentScriptCssResources);
+    }
   }
 }
 
@@ -409,24 +432,77 @@ function addDevModePermissions(
  */
 export function getContentScriptCssFiles(
   contentScripts: ContentScriptEntrypoint[],
-  buildOutput: Omit<BuildOutput, 'manifest'>,
+  contentScriptCssMap: Record<string, string | undefined>,
 ): string[] | undefined {
   const css: string[] = [];
 
-  const allChunks = buildOutput.steps.flatMap((step) => step.chunks);
-
   contentScripts.forEach((script) => {
-    // TODO: optimize and remove loop with a map
-    const relatedCss = allChunks.find(
-      (chunk) => chunk.fileName === `assets/${script.name}.css`,
-    );
-    if (relatedCss) css.push(relatedCss.fileName);
+    if (
+      script.options.cssInjectionMode === 'manual' ||
+      script.options.cssInjectionMode === 'ui'
+    )
+      return;
+
+    const cssFile = contentScriptCssMap[script.name];
+    if (cssFile == null) return;
+
+    if (cssFile) css.push(cssFile);
   });
 
   if (css.length > 0) return css;
   return undefined;
 }
 
+/**
+ * Content scripts configured with `cssInjectionMode: "ui"` need to add their CSS files to web
+ * accessible resources so they can be fetched as text and added to shadow roots that the UI is
+ * added to.
+ */
+export function getContentScriptCssWebAccessibleResources(
+  config: InternalConfig,
+  contentScripts: ContentScriptEntrypoint[],
+  contentScriptCssMap: Record<string, string | undefined>,
+): any[] {
+  const resources: any[] = [];
+
+  contentScripts.forEach((script) => {
+    if (script.options.cssInjectionMode !== 'ui') return;
+
+    const cssFile = contentScriptCssMap[script.name];
+    if (cssFile == null) return;
+
+    if (config.manifestVersion === 2) {
+      resources.push(cssFile);
+    } else {
+      resources.push({
+        resources: [cssFile],
+        matches: script.options.matches,
+      });
+    }
+  });
+
+  return resources;
+}
+
+/**
+ * Based on the build output, return a Record of each content script's name to it CSS file if the
+ * script includes one.
+ */
+export function getContentScriptsCssMap(
+  buildOutput: Omit<BuildOutput, 'manifest'>,
+  scripts: ContentScriptEntrypoint[],
+) {
+  const map: Record<string, string | undefined> = {};
+  const allChunks = buildOutput.steps.flatMap((step) => step.chunks);
+  scripts.forEach((script) => {
+    const relatedCss = allChunks.find(
+      (chunk) => chunk.fileName === `content-scripts/${script.name}.css`,
+    );
+    if (relatedCss != null) map[script.name] = relatedCss.fileName;
+  });
+  return map;
+}
+
 function addPermission(
   manifest: Manifest.WebExtensionManifest,
   permission: string,

src/testing/fake-objects.ts

@@ -240,5 +240,6 @@ export const fakeInternalConfig = fakeObjectCreator<InternalConfig>(() => {
       name: faker.person.firstName().toLowerCase(),
     },
     transformManifest: () => {},
+    userConfigMetadata: {},
   };
 });

templates/react/wxt.config.ts

@@ -1,7 +1,7 @@
 import { defineConfig } from 'wxt';
 import react from '@vitejs/plugin-react';
 
-// See https://wxt.dev/config.html
+// See https://wxt.dev/api/config.html
 export default defineConfig({
   vite: () => ({
     plugins: [react()],

templates/solid/wxt.config.ts

@@ -1,7 +1,7 @@
 import { defineConfig } from 'wxt';
 import Solid from 'vite-plugin-solid';
 
-// See https://wxt.dev/config.html
+// See https://wxt.dev/api/config.html
 export default defineConfig({
   vite: () => ({
     build: {

templates/svelte/wxt.config.ts

@@ -1,7 +1,7 @@
 import { defineConfig } from 'wxt';
 import { svelte, vitePreprocess } from '@sveltejs/vite-plugin-svelte';
 
-// See https://wxt.dev/config.html
+// See https://wxt.dev/api/config.html
 export default defineConfig({
   srcDir: 'src',
   vite: () => ({

templates/vanilla/wxt.config.ts

@@ -1,4 +1,4 @@
 import { defineConfig } from 'wxt';
 
-// See https://wxt.dev/config.html
+// See https://wxt.dev/api/config.html
 export default defineConfig({});

templates/vue/wxt.config.ts

@@ -1,7 +1,7 @@
 import { defineConfig } from 'wxt';
 import vue from '@vitejs/plugin-vue';
 
-// See https://wxt.dev/config.html
+// See https://wxt.dev/api/config.html
 export default defineConfig({
   vite: () => ({
     plugins: [vue()],

vitest.setup.ts

@@ -0,0 +1,2 @@
+// @ts-expect-error
+globalThis.__ENTRYPOINT__ = 'test';

vitest.workspace.ts

@@ -25,6 +25,7 @@ export default defineWorkspace([
       dir: 'src',
       mockReset: true,
       restoreMocks: true,
+      setupFiles: 'vitest.setup.ts',
     },
     plugins: [testSeed()],
   },