fix(worker): asset in iife worker and relative base

Author: sapphi-red

packages/vite/src/node/build.ts

@@ -1076,6 +1076,12 @@ const relativeUrlMechanisms: Record<
 }
 /* end of copy */
 
+const customRelativeUrlMechanisms = {
+  ...relativeUrlMechanisms,
+  'worker-iife': (relativePath) =>
+    getResolveUrl(`'${relativePath}', self.location.href`),
+} as const satisfies Record<string, (relativePath: string) => string>
+
 export type RenderBuiltAssetUrl = (
   filename: string,
   type: {
@@ -1125,8 +1131,10 @@ export function toOutputFilePathInJS(
 
 export function createToImportMetaURLBasedRelativeRuntime(
   format: InternalModuleFormat,
+  isWorker: boolean,
 ): (filename: string, importer: string) => { runtime: string } {
-  const toRelativePath = relativeUrlMechanisms[format]
+  const formatLong = isWorker && format === 'iife' ? 'worker-iife' : format
+  const toRelativePath = customRelativeUrlMechanisms[formatLong]
   return (filename, importer) => ({
     runtime: toRelativePath(
       path.posix.relative(path.dirname(importer), filename),

packages/vite/src/node/plugins/asset.ts

@@ -69,6 +69,7 @@ export function renderAssetUrlInJS(
 ): MagicString | undefined {
   const toRelativeRuntime = createToImportMetaURLBasedRelativeRuntime(
     opts.format,
+    config.isWorker,
   )
 
   let match: RegExpExecArray | null

packages/vite/src/node/plugins/worker.ts

@@ -355,6 +355,7 @@ export function webWorkerPlugin(config: ResolvedConfig): Plugin {
       if (code.match(workerAssetUrlRE) || code.includes('import.meta.url')) {
         const toRelativeRuntime = createToImportMetaURLBasedRelativeRuntime(
           outputOptions.format,
+          config.isWorker,
         )
 
         let match: RegExpExecArray | null