chore(release): wxt v0.19.6

.gitignore

@@ -21,3 +21,4 @@ docs/api/reference
 stats.html
 .tool-versions
 .cache
+*-stats.txt

CONTRIBUTING.md

@@ -57,6 +57,21 @@ pnpm test
 pnpm docs:dev
 ```
 
+## Profiling
+
+```sh
+# Build the latest version
+pnpm --filter wxt build
+
+# CD to the demo directory
+cd packages/wxt-demo
+
+# 1. Generate a flamechart with 0x
+pnpm dlx 0x node_modules/wxt/bin/wxt.mjs build
+# 2. Inspect the process with chrome @ chrome://inspect
+pnpm node --inspect node_modules/wxt/bin/wxt.mjs build
+```
+
 ## Updating Docs
 
 Documentation is written with VitePress, and is located in the `docs/` directory.

docs/guide/go-further/es-modules.md

@@ -35,4 +35,6 @@ Only MV3 support ESM background scripts/service workers. When targeting MV2, the
 
 ## Content Scripts
 
-Coming soon. Follow [Content Script ESM Support #357](https://github.com/wxt-dev/wxt/issues/357) for updates.
+WXT does not include built-in support for ESM content scripts. There are several technical issues that make implementing a generic solution impossible. See [Content Script ESM Support #357](https://github.com/wxt-dev/wxt/issues/357) for details.
+
+Instead, depending on your requirements, you can implement ESM support manually. See the [ESM Content Script UI](https://github.com/wxt-dev/examples/tree/main/examples/esm-content-script-ui) example to get started.

packages/module-solid/CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog
 
+## v1.1.2
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/module-solid-v1.1.1...module-solid-v1.1.2)
+
+### 🏡 Chore
+
+- **deps:** Bump all non-major dependencies ([#834](https://github.com/wxt-dev/wxt/pull/834))
+- **deps:** Upgrade all dependencies ([#869](https://github.com/wxt-dev/wxt/pull/869))
+- Add more metadata for npm ([#885](https://github.com/wxt-dev/wxt/pull/885))
+
+### ❤️ Contributors
+
+- Florian Metz ([@Timeraa](http://github.com/Timeraa))
+
 ## v1.1.1
 
 [compare changes](https://github.com/wxt-dev/wxt/compare/module-solid-v1.1.0...module-solid-v1.1.1)

packages/module-solid/package.json

@@ -17,7 +17,7 @@
     "email": "aaronklinker1+wxt@gmail.com"
   },
   "license": "MIT",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "type": "module",
   "main": "./dist/index.cjs",
   "module": "./dist/index.mjs",

packages/module-svelte/CHANGELOG.md

@@ -1,5 +1,31 @@
 # Changelog
 
+## v1.0.1
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/module-svelte-v1.0.0...module-svelte-v1.0.1)
+
+### 🩹 Fixes
+
+- Upgrade wxt peer to >= 0.18.6 ([7edf1c8](https://github.com/wxt-dev/wxt/commit/7edf1c8))
+
+### 📖 Documentation
+
+- Fix link to unimport ([#826](https://github.com/wxt-dev/wxt/pull/826))
+
+### 🏡 Chore
+
+- Add changelog ([21e8ca0](https://github.com/wxt-dev/wxt/commit/21e8ca0))
+- Extract build cache script to NPM package ([#737](https://github.com/wxt-dev/wxt/pull/737))
+- **deps:** Upgrade non-major deps ([#778](https://github.com/wxt-dev/wxt/pull/778))
+- **deps:** Bump all non-major dependencies ([#834](https://github.com/wxt-dev/wxt/pull/834))
+- **deps:** Upgrade all dependencies ([#869](https://github.com/wxt-dev/wxt/pull/869))
+- Add more metadata for npm ([#885](https://github.com/wxt-dev/wxt/pull/885))
+
+### ❤️ Contributors
+
+- Florian Metz ([@Timeraa](http://github.com/Timeraa))
+- Eetann ([@eetann](http://github.com/eetann))
+
 ## v1.0.0
 
-Initial release 🎉
+Initial release 🎉

packages/module-svelte/package.json

@@ -17,7 +17,7 @@
     "email": "aaronklinker1+wxt@gmail.com"
   },
   "license": "MIT",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "type": "module",
   "main": "./dist/index.cjs",
   "module": "./dist/index.mjs",

packages/module-vue/CHANGELOG.md

@@ -1,5 +1,26 @@
 # Changelog
 
+## v1.0.1
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/module-vue-v1.0.0...module-vue-v1.0.1)
+
+### 🩹 Fixes
+
+- Upgrade wxt peer to >= 0.18.6 ([7edf1c8](https://github.com/wxt-dev/wxt/commit/7edf1c8))
+
+### 🏡 Chore
+
+- Add changelog ([21e8ca0](https://github.com/wxt-dev/wxt/commit/21e8ca0))
+- Extract build cache script to NPM package ([#737](https://github.com/wxt-dev/wxt/pull/737))
+- **deps:** Upgrade non-major deps ([#778](https://github.com/wxt-dev/wxt/pull/778))
+- **deps:** Bump all non-major dependencies ([#834](https://github.com/wxt-dev/wxt/pull/834))
+- **deps:** Upgrade all dependencies ([#869](https://github.com/wxt-dev/wxt/pull/869))
+- Add more metadata for npm ([#885](https://github.com/wxt-dev/wxt/pull/885))
+
+### ❤️ Contributors
+
+- Florian Metz ([@Timeraa](http://github.com/Timeraa))
+
 ## v1.0.0
 
-Initial release 🎉
+Initial release 🎉

packages/module-vue/package.json

@@ -17,7 +17,7 @@
     "email": "aaronklinker1+wxt@gmail.com"
   },
   "license": "MIT",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "type": "module",
   "main": "./dist/index.cjs",
   "module": "./dist/index.mjs",

packages/wxt/CHANGELOG.md

@@ -1,5 +1,42 @@
 # Changelog
 
+## v0.19.6
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/wxt-v0.19.5...wxt-v0.19.6)
+
+### 🔥 Performance
+
+- Ignore non-source code from the file watcher ([#919](https://github.com/wxt-dev/wxt/pull/919))
+
+### 🩹 Fixes
+
+- Typo in sidepanel options (`browse_style` → `browser_style`) ([#914](https://github.com/wxt-dev/wxt/pull/914))
+- **types:** Don't report type errors when using string templates with `browser.i18n.getMessage` ([#916](https://github.com/wxt-dev/wxt/pull/916))
+
+### ❤️ Contributors
+
+- 1natsu
+
+## v0.19.5
+
+[compare changes](https://github.com/wxt-dev/wxt/compare/wxt-v0.19.4...wxt-v0.19.5)
+
+### 🚀 Enhancements
+
+- Allow zipping hidden files by listing them explicitly in `includeSources` ([#902](https://github.com/wxt-dev/wxt/pull/902))
+- Allow excluding files when zipping ([#906](https://github.com/wxt-dev/wxt/pull/906))
+
+### 🩹 Fixes
+
+- #907 move wxt devDeps execa to dependencies ([#908](https://github.com/wxt-dev/wxt/pull/908), [#907](https://github.com/wxt-dev/wxt/issues/907))
+- Update chromium setting for enabling content script sourcemaps ([e6529e6](https://github.com/wxt-dev/wxt/commit/e6529e6))
+
+### ❤️ Contributors
+
+- 1natsu 
+- Florian Metz ([@Timeraa](http://github.com/Timeraa))
+- Hikiko4ern ([@hikiko4ern](http://github.com/hikiko4ern))
+
 ## v0.19.4
 
 [compare changes](https://github.com/wxt-dev/wxt/compare/wxt-v0.19.3...wxt-v0.19.4)
@@ -2353,4 +2390,4 @@ Initial release of WXT. Full support for production builds and initial toolkit f
 ### 🤖 CI
 
 - Create validation workflow ([#12](https://github.com/wxt-dev/wxt/pull/12))
-- Create release workflow ([#13](https://github.com/wxt-dev/wxt/pull/13))
+- Create release workflow ([#13](https://github.com/wxt-dev/wxt/pull/13))

packages/wxt/e2e/tests/typescript-project.test.ts

@@ -126,7 +126,7 @@ describe('TypeScript Project', () => {
         export interface WxtI18n extends I18n.Static {
           /**
            * The extension or app ID; you might use this string to construct URLs for resources inside the extension. Even unlocalized extensions can use this message.
-      Note: You can't use this message in a manifest file.
+           * Note: You can't use this message in a manifest file.
            *
            * "<browser.runtime.id>"
            */
@@ -136,8 +136,6 @@ describe('TypeScript Project', () => {
             options?: GetMessageOptions,
           ): string;
           /**
-           * No message description.
-           *
            * "<browser.i18n.getUiLocale()>"
            */
           getMessage(
@@ -215,6 +213,11 @@ describe('TypeScript Project', () => {
             substitutions?: string | string[],
             options?: GetMessageOptions,
           ): string;
+          getMessage(
+            messageName: "@@extension_id" | "@@ui_locale" | "@@bidi_dir" | "@@bidi_reversed_dir" | "@@bidi_start_edge" | "@@bidi_end_edge" | "prompt_for_name" | "hello" | "bye",
+            substitutions?: string | string[],
+            options?: GetMessageOptions,
+          ): string;
         }
       }
       "

packages/wxt/e2e/tests/zip.test.ts

@@ -97,8 +97,7 @@ describe('Zipping', () => {
     expect(await project.fileExists(sourcesZip)).toBe(true);
   });
 
-  // TODO: Fix #738 and re-enable
-  it.skip('should not zip hidden files into sources by default', async () => {
+  it('should not zip hidden files into sources by default', async () => {
     const project = new TestProject({
       name: 'test',
       version: '1.0.0',
@@ -108,6 +107,7 @@ describe('Zipping', () => {
       'export default defineBackground(() => {});',
     );
     project.addFile('.env');
+    project.addFile('.hidden-dir/file');
     const unzipDir = project.resolvePath('.output/test-1.0.0-sources');
     const sourcesZip = project.resolvePath('.output/test-1.0.0-sources.zip');
 
@@ -116,10 +116,37 @@ describe('Zipping', () => {
     });
     await extract(sourcesZip, { dir: unzipDir });
     expect(await project.fileExists(unzipDir, '.env')).toBe(false);
+    expect(await project.fileExists(unzipDir, '.hidden-dir/file')).toBe(false);
   });
 
-  // TODO: Fix #738 and re-enable
-  it.skip('should allow zipping hidden files into sources when explicitly listed', async () => {
+  it('should not zip files inside hidden directories if only the directory is specified', async () => {
+    const project = new TestProject({
+      name: 'test',
+      version: '1.0.0',
+    });
+    project.addFile(
+      'entrypoints/background.ts',
+      'export default defineBackground(() => {});',
+    );
+    project.addFile('.hidden-dir/file');
+    project.addFile('.hidden-dir/nested/file');
+    const unzipDir = project.resolvePath('.output/test-1.0.0-sources');
+    const sourcesZip = project.resolvePath('.output/test-1.0.0-sources.zip');
+
+    await project.zip({
+      browser: 'firefox',
+      zip: {
+        includeSources: ['.hidden-dir'],
+      },
+    });
+    await extract(sourcesZip, { dir: unzipDir });
+    expect(await project.fileExists(unzipDir, '.hidden-dir/file')).toBe(false);
+    expect(await project.fileExists(unzipDir, '.hidden-dir/nested/file')).toBe(
+      false,
+    );
+  });
+
+  it('should allow zipping hidden files into sources when explicitly listed', async () => {
     const project = new TestProject({
       name: 'test',
       version: '1.0.0',
@@ -129,16 +156,26 @@ describe('Zipping', () => {
       'export default defineBackground(() => {});',
     );
     project.addFile('.env');
+    project.addFile('.hidden-dir/file');
+    project.addFile('.hidden-dir/nested/file1');
+    project.addFile('.hidden-dir/nested/file2');
     const unzipDir = project.resolvePath('.output/test-1.0.0-sources');
     const sourcesZip = project.resolvePath('.output/test-1.0.0-sources.zip');
 
     await project.zip({
       browser: 'firefox',
       zip: {
-        includeSources: ['.env'],
+        includeSources: ['.env', '.hidden-dir/file', '.hidden-dir/nested/**'],
       },
     });
     await extract(sourcesZip, { dir: unzipDir });
     expect(await project.fileExists(unzipDir, '.env')).toBe(true);
+    expect(await project.fileExists(unzipDir, '.hidden-dir/file')).toBe(true);
+    expect(await project.fileExists(unzipDir, '.hidden-dir/nested/file1')).toBe(
+      true,
+    );
+    expect(await project.fileExists(unzipDir, '.hidden-dir/nested/file2')).toBe(
+      true,
+    );
   });
 });

packages/wxt/package.json

@@ -1,7 +1,7 @@
 {
   "name": "wxt",
   "type": "module",
-  "version": "0.19.4",
+  "version": "0.19.6",
   "description": "Next gen framework for developing web extensions",
   "repository": {
     "type": "git",
@@ -95,6 +95,7 @@
     "defu": "^6.1.4",
     "dequal": "^2.0.3",
     "esbuild": "^0.23.0",
+    "execa": "^9.3.0",
     "fast-glob": "^3.3.2",
     "filesize": "^10.1.4",
     "fs-extra": "^11.2.0",
@@ -133,7 +134,6 @@
     "@types/node": "^20.14.12",
     "@types/normalize-path": "^3.0.2",
     "@types/prompts": "^2.4.9",
-    "execa": "^9.3.0",
     "extract-zip": "^2.0.1",
     "happy-dom": "^14.12.3",
     "lodash.merge": "^4.6.2",

packages/wxt/src/core/builders/vite/index.ts

@@ -287,6 +287,9 @@ export async function createViteBuilder(
           strictPort: true,
           host: info.hostname,
           origin: info.origin,
+          watch: {
+            ignored: [`${wxtConfig.outBaseDir}/**`, `${wxtConfig.wxtDir}/**`],
+          },
         },
       };
       const baseConfig = await getBaseConfig();

packages/wxt/src/core/builders/vite/plugins/bundleAnalysis.ts

@@ -6,7 +6,6 @@ import path from 'node:path';
 let increment = 0;
 
 export function bundleAnalysis(config: ResolvedConfig): vite.Plugin {
-  // @ts-expect-error: Vite version mismatch
   return visualizer({
     template: 'raw-data',
     filename: path.resolve(

packages/wxt/src/core/create-server.ts

@@ -145,11 +145,6 @@ function createFileReloader(server: WxtDevServer) {
   const changeQueue: Array<[string, string]> = [];
 
   return async (event: string, path: string) => {
-    await wxt.reloadConfig();
-
-    // Here, "path" is a non-normalized path (ie: C:\\users\\... instead of C:/users/...)
-    if (path.startsWith(wxt.config.outBaseDir)) return;
-    if (path.startsWith(wxt.config.wxtDir)) return;
     changeQueue.push([event, path]);
 
     await fileChangedMutex.runExclusive(async () => {
@@ -160,6 +155,8 @@ function createFileReloader(server: WxtDevServer) {
         .map(([_, file]) => file);
       if (fileChanges.length === 0) return;
 
+      await wxt.reloadConfig();
+
       const changes = detectDevChanges(fileChanges, server.currentOutput);
       if (changes.type === 'no-change') return;
 

packages/wxt/src/core/runners/web-ext.ts

@@ -97,6 +97,9 @@ const DEFAULT_CHROMIUM_PREFS = {
       // and log locations show up properly, see:
       // https://github.com/wxt-dev/wxt/issues/236#issuecomment-1915364520
       skipContentScripts: false,
+      // Was renamed at some point, see:
+      // https://github.com/wxt-dev/wxt/issues/912#issuecomment-2284288171
+      'skip-content-scripts': false,
     },
   },
 };

packages/wxt/src/core/utils/building/find-entrypoints.ts

@@ -387,7 +387,7 @@ async function getSidepanelEntrypoint(
   const options = await getHtmlEntrypointOptions<SidepanelEntrypointOptions>(
     info,
     {
-      browserStyle: 'browse_style',
+      browserStyle: 'browser_style',
       exclude: 'exclude',
       include: 'include',
       defaultIcon: 'default_icon',

packages/wxt/src/core/utils/building/generate-wxt-dir.ts

@@ -150,18 +150,43 @@ declare module "wxt/browser" {
     messages = parseI18nMessages({});
   }
 
-  const overrides = messages.map((message) => {
-    return `    /**
-     * ${message.description || 'No message description.'}
-     *
-     * "${message.message}"
-     */
-    getMessage(
-      messageName: "${message.name}",
+  const renderGetMessageOverload = (
+    keyType: string,
+    description?: string,
+    translation?: string,
+  ) => {
+    const commentLines: string[] = [];
+    if (description) commentLines.push(...description.split('\n'));
+    if (translation) {
+      if (commentLines.length > 0) commentLines.push('');
+      commentLines.push(`"${translation}"`);
+    }
+    const comment =
+      commentLines.length > 0
+        ? `/**\n${commentLines.map((line) => `     * ${line}`.trimEnd()).join('\n')}\n     */\n    `
+        : '';
+    return `    ${comment}getMessage(
+      messageName: ${keyType},
       substitutions?: string | string[],
       options?: GetMessageOptions,
     ): string;`;
-  });
+  };
+
+  const overrides = [
+    // Generate individual overloads for each message so JSDoc contains description and base translation.
+    ...messages.map((message) =>
+      renderGetMessageOverload(
+        `"${message.name}"`,
+        message.description,
+        message.message,
+      ),
+    ),
+    // Include a final union-based override so TS accepts valid string templates or concatinations
+    // ie: browser.i18n.getMessage(`some_enum_${enumValue}`)
+    renderGetMessageOverload(
+      messages.map((message) => `"${message.name}"`).join(' | '),
+    ),
+  ];
 
   return {
     path: 'types/i18n.d.ts',

packages/wxt/src/core/utils/building/resolve-config.ts

@@ -268,6 +268,7 @@ function resolveZipConfig(
     includeSources: [],
     compressionLevel: 9,
     ...mergedConfig.zip,
+    exclude: mergedConfig.zip?.exclude ?? [],
     excludeSources: [
       '**/node_modules',
       // WXT files

packages/wxt/src/core/utils/testing/fake-objects.ts

@@ -286,6 +286,7 @@ export const fakeResolvedConfig = fakeObjectCreator<ResolvedConfig>(() => {
       artifactTemplate: '{{name}}-{{version}}.zip',
       includeSources: [],
       excludeSources: [],
+      exclude: [],
       sourcesRoot: fakeDir(),
       sourcesTemplate: '{{name}}-sources.zip',
       name: faker.person.firstName().toLowerCase(),

packages/wxt/src/core/zip.ts

@@ -47,7 +47,9 @@ export async function zip(config?: InlineConfig): Promise<string[]> {
 
   const outZipFilename = applyTemplate(wxt.config.zip.artifactTemplate);
   const outZipPath = path.resolve(wxt.config.outBaseDir, outZipFilename);
-  await zipDir(wxt.config.outDir, outZipPath);
+  await zipDir(wxt.config.outDir, outZipPath, {
+    exclude: wxt.config.zip.exclude,
+  });
   zipFiles.push(outZipPath);
 
   // ZIP sources for Firefox
@@ -99,13 +101,11 @@ async function zipDir(
 ): Promise<void> {
   const archive = new JSZip();
   const files = (
-    await glob('**/*', {
+    await glob(['**/*', ...(options?.include || [])], {
       cwd: directory,
       // Ignore node_modules, otherwise this glob step takes forever
       ignore: ['**/node_modules'],
       onlyFiles: true,
-      // TODO: Fix #738
-      // dot: true,
     })
   ).filter((relativePath) => {
     return (

packages/wxt/src/types.ts

@@ -181,6 +181,16 @@ export interface InlineConfig {
      * ]
      */
     excludeSources?: string[];
+    /**
+     * [Minimatch](https://www.npmjs.com/package/minimatch) patterns of files to exclude when
+     * zipping the extension.
+     *
+     * @example
+     * [
+     *   "**\/*.map", // Exclude all sourcemaps
+     * ]
+     */
+    exclude?: string[];
     /**
      * The Firefox review process requires the extension be buildable from source to make reviewing
      * easier. This field allows you to use private packages without exposing your auth tokens.
@@ -1192,6 +1202,7 @@ export interface ResolvedConfig {
     downloadedPackagesDir: string;
     downloadPackages: string[];
     compressionLevel: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9;
+    exclude: string[];
   };
   /**
    * @deprecated Use `build:manifestGenerated` hook instead.

pnpm-lock.yaml

@@ -219,7 +219,7 @@ importers:
     dependencies:
       '@aklinker1/rollup-plugin-visualizer':
         specifier: 5.12.0
-        version: 5.12.0(rollup@3.29.4)
+        version: 5.12.0(rollup@4.19.0)
       '@types/webextension-polyfill':
         specifier: ^0.10.7
         version: 0.10.7
@@ -259,6 +259,9 @@ importers:
       esbuild:
         specifier: ^0.23.0
         version: 0.23.0
+      execa:
+        specifier: ^9.3.0
+        version: 9.3.0
       fast-glob:
         specifier: ^3.3.2
         version: 3.3.2
@@ -327,7 +330,7 @@ importers:
         version: 2.1.3
       unimport:
         specifier: ^3.9.1
-        version: 3.9.1(rollup@3.29.4)
+        version: 3.9.1(rollup@4.19.0)
       vite:
         specifier: ^5.3.5
         version: 5.3.5(@types/node@20.14.12)(sass@1.77.8)
@@ -368,9 +371,6 @@ importers:
       '@types/prompts':
         specifier: ^2.4.9
         version: 2.4.9
-      execa:
-        specifier: ^9.3.0
-        version: 9.3.0
       extract-zip:
         specifier: ^2.0.1
         version: 2.0.1
@@ -4691,14 +4691,14 @@ snapshots:
       citty: 0.1.6
       typescript: 5.5.4
 
-  '@aklinker1/rollup-plugin-visualizer@5.12.0(rollup@3.29.4)':
+  '@aklinker1/rollup-plugin-visualizer@5.12.0(rollup@4.19.0)':
     dependencies:
       open: 8.4.2
       picomatch: 2.3.1
       source-map: 0.7.4
       yargs: 17.7.2
     optionalDependencies:
-      rollup: 3.29.4
+      rollup: 4.19.0
 
   '@algolia/autocomplete-core@1.9.3(@algolia/client-search@4.20.0)(algoliasearch@4.20.0)(search-insights@2.15.0)':
     dependencies:
@@ -5417,6 +5417,14 @@ snapshots:
     optionalDependencies:
       rollup: 3.29.4
 
+  '@rollup/pluginutils@5.1.0(rollup@4.19.0)':
+    dependencies:
+      '@types/estree': 1.0.5
+      estree-walker: 2.0.2
+      picomatch: 2.3.1
+    optionalDependencies:
+      rollup: 4.19.0
+
   '@rollup/rollup-android-arm-eabi@4.19.0':
     optional: true
 
@@ -8659,9 +8667,9 @@ snapshots:
 
   undici-types@5.26.5: {}
 
-  unimport@3.9.1(rollup@3.29.4):
+  unimport@3.9.1(rollup@4.19.0):
     dependencies:
-      '@rollup/pluginutils': 5.1.0(rollup@3.29.4)
+      '@rollup/pluginutils': 5.1.0(rollup@4.19.0)
       acorn: 8.12.1
       escape-string-regexp: 5.0.0
       estree-walker: 3.0.3

scripts/benchmarks/browser-startup.patch

@@ -0,0 +1,26 @@
+diff --git a/packages/wxt/src/core/runners/web-ext.ts b/packages/wxt/src/core/runners/web-ext.ts
+index 09819c3..a0f0df2 100644
+--- a/packages/wxt/src/core/runners/web-ext.ts
++++ b/packages/wxt/src/core/runners/web-ext.ts
+@@ -3,6 +3,8 @@ import { ExtensionRunner } from '../../types';
+ import { formatDuration } from '../utils/time';
+ import defu from 'defu';
+ import { wxt } from '../wxt';
++import fs from 'node:fs';
++import stream from 'node:stream/promises';
+ 
+ /**
+  * Create an `ExtensionRunner` backed by `web-ext`.
+@@ -78,6 +80,12 @@ export function createWebExtRunner(): ExtensionRunner {
+ 
+       const duration = Date.now() - startTime;
+       wxt.logger.success(`Opened browser in ${formatDuration(duration)}`);
++      await runner.exit();
++      const s = fs.createWriteStream('stats.txt', { flags: 'a' });
++      s.write(duration + ' ');
++      s.end();
++      await stream.finished(s);
++      process.exit(0);
+     },
+ 
+     async closeBrowser() {

scripts/benchmarks/browser-startup.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+set -e
+
+#
+# Benchmark how long it takes for the browser to open in dev mode.
+#
+# To run:
+#   cd <root>
+#   ./scripts/benchmarks/browser-startup.sh
+#
+# You can set N below to change the number of samples per git ref.
+#
+
+N=20
+
+function benchmark_ref() {
+    # Prep
+    git checkout $1
+    pnpm buildc clean
+    git apply scripts/benchmarks/browser-startup.patch
+    pnpm i --ignore-scripts
+    pnpm -r --filter wxt build
+    echo -n "$1 " >> stats.txt
+
+    # Run benchmark
+    for i in $(seq $N); do
+        pnpm wxt packages/wxt-demo
+    done
+    git checkout HEAD -- packages/wxt/src/core/runners/web-ext.ts pnpm-lock.yaml
+    echo "" >> stats.txt
+}
+
+rm -f stats.txt
+
+benchmark_ref "HEAD"
+
+# Benchmark a commit:
+#   benchmark_ref "3109bba"
+#
+# Benchmark a version:
+#   benchmark_ref "v0.19.0"