fix!: Move browser constants to import.meta.env (#380)

BREAKING CHANGE: Renamed undocumented constants:

- `__BROWSER__` → `import.meta.env.BROWSER`
- `__COMMAND__` → `import.meta.env.COMMAND`
- `__MANIFEST_VERSION__` → `import.meta.env.MANIFEST_VERSION`
- `__IS_CHROME__` → `import.meta.env.CHROME`
- `__IS_FIREFOX__` → `import.meta.env.FIREFOX`
- `__IS_SAFARI__` → `import.meta.env.SAFARI`
- `__IS_EDGE__` → `import.meta.env.EDGE`
- `__IS_OPERA__` → `import.meta.env.OPERA`

src/client/content-scripts/custom-events.ts

@@ -15,10 +15,12 @@ export class WxtLocationChangeEvent extends Event {
  * Returns an event name unique to the extension and content script that's running.
  */
 export function getUniqueEventName(eventName: string): string {
-  // During the build process, __ENTRYPOINT__ is not defined when importing entrypoints to get their
-  // metadata.
+  // During the build process, import.meta.env is not defined when importing
+  // entrypoints to get their metadata.
   const entrypointName =
-    typeof __ENTRYPOINT__ === 'undefined' ? 'build' : __ENTRYPOINT__;
+    typeof import.meta.env === 'undefined'
+      ? 'build'
+      : import.meta.env.ENTRYPOINT;
 
   return `${browser.runtime.id}:${entrypointName}:${eventName}`;
 }

src/client/content-scripts/ui/index.ts

@@ -236,7 +236,9 @@ function mountUi(
  * Load the CSS for the current entrypoint.
  */
 async function loadCss(): Promise<string> {
-  const url = browser.runtime.getURL(`/content-scripts/${__ENTRYPOINT__}.css`);
+  const url = browser.runtime.getURL(
+    `/content-scripts/${import.meta.env.ENTRYPOINT}.css`,
+  );
   try {
     const res = await fetch(url);
     return await res.text();