feat: Add modifyScript option to injectScript

It enables the modification of the script element just before it is
added to the DOM.

It can be used to e.g.  modify `script.async`/`script.defer`, add event
listeners to the element, or pass data to the script via
`script.dataset` (which can be accessed by the script via
`document.currentScript`).

Author: ion1

docs/guide/essentials/content-scripts.md

@@ -591,6 +591,29 @@ For MV3, `injectScript` is synchronous and the injected script will be evaluated
 However for MV2, `injectScript` has to `fetch` the script's text content and create an inline `<script>` block. This means for MV2, your script is injected asynchronously and it will not be evaluated at the same time as your content script's `run_at`.
 :::
 
+The `script` element can be modified just before it is added to the DOM by using the `modifyScript` option. This can be used to e.g. modify `script.async`/`script.defer`, add event listeners to the element, or pass data to the script via `script.dataset`. An example:
+
+```ts
+// entrypoints/example.content.ts
+export default defineContentScript({
+  matches: ['*://*/*'],
+  async main() {
+    await injectScript('/example-main-world.js', {
+      manipulateScript(script) {
+        script.dataset['greeting'] = 'Hello there';
+      },
+    });
+  },
+});
+```
+
+```ts
+// entrypoints/example-main-world.ts
+export default defineUnlistedScript(() => {
+  console.log(document.currentScript?.dataset['greeting']);
+});
+```
+
 ## Mounting UI to dynamic element
 
 In many cases, you may need to mount a UI to a DOM element that does not exist at the time the web page is initially loaded. To handle this, use the `autoMount` API to automatically mount the UI when the target element appears dynamically and unmount it when the element disappears. In WXT, the `anchor` option is used to target the element, enabling automatic mounting and unmounting based on its appearance and removal.

packages/wxt/src/utils/inject-script.ts

@@ -32,6 +32,8 @@ export async function injectScript(
     script.src = url;
   }
 
+  await options?.modifyScript?.(script);
+
   (document.head ?? document.documentElement).append(script);
 
   if (!options?.keepInDom) {
@@ -45,4 +47,12 @@ export interface InjectScriptOptions {
    * injected. To disable this behavior, set this flag to true.
    */
   keepInDom?: boolean;
+  /**
+   * Modify the script element just before it is added to the DOM.
+   *
+   * It can be used to e.g. modify `script.async`/`script.defer`, add event
+   * listeners to the element, or pass data to the script via `script.dataset`
+   * (which can be accessed by the script via `document.currentScript`).
+   */
+  modifyScript?: (script: HTMLScriptElement) => Promise<void> | void;
 }