fix(rollup-plugin-import-meta-assets): completely overwrite import.meta.url

[cprecioso]

This removes the duplicated import.meta.url in the output, like this:

 // Pre-bundling code
 new URL("./some-internal-path.png", import.meta.url)
 
 // Bundled code in ESM output 
-new URL(new URL("asset/bundled-asset.png", import.meta.url).href, import.meta.url) 
+new URL(new URL("asset/bundled-asset.png", import.meta.url).href) 

 // Bundled code in CJS output 
 new URL(
   "undefined" == typeof document
     ? new (require("url").URL)(
         "file:" + __dirname + "/assets/InterLatin-b0e9bc2a.woff2"
       ).href
     : new URL(
         "assets/InterLatin-b0e9bc2a.woff2",
         (document.currentScript && document.currentScript.src) ||
           document.baseURI
       ).href
-, import.meta.url); // Uncaught SyntaxError: Cannot use 'import.meta' outside a module
+);

Why

This way, it should work exactly the same (Rollup makes sure we have import.meta.url or something similar to base our URL on); but the second import.meta gets eliminated, which reduces size, repetition, and most of all, doesn't trigger an error in Common JS modules.

What I did

1. Updated the overwrite function

   // Before
   new URL("myFile.tx", import.meta.url)
   //      |---------|
   //      Only this part was overwritten
   
   // After
   new URL("myFile.tx", import.meta.url)
   //      |--------------------------|
   //      Now everything is overwritten

2. Updated tests

I made it a minor change as it should supposedly not modify the functionality of the plugin, but maybe it should be a major as it modifies its output?

[changeset-bot]

🦋 Changeset detected

Latest commit: 6ab8a0a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@web/rollup-plugin-import-meta-assets	Minor

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