Replace sourcemap in output correctly

See: https://github.com/expo/eas-hosting/blob/bd72f7ef735d956b1ce2f85b3d818447f33fd6ab/workers/deployment-api/src/services/workerUpload.ts#L35-L56
This needs to vaguely match: https://github.com/cloudflare/workers-sdk/blob/508a1a31a039a5f4700efbc7535a165d79b22cb9/packages/wrangler/src/deployment-bundle/source-maps.ts#L27-L63

CHANGELOG.md

@@ -14,6 +14,8 @@ This is the log of notable changes to EAS CLI and related packages.
 
 ### 🐛 Bug fixes
 
+- Add missing sourcemap normalization to EAS Hosting worker deployment uploads. ([#3004](https://github.com/expo/eas-cli/pull/3004) by [@kitten](https://github.com/kitten))
+
 ### 🧹 Chores
 
 ## [16.3.3](https://github.com/expo/eas-cli/releases/tag/v16.3.3) - 2025-04-24

packages/eas-cli/src/worker/assets.ts

@@ -141,6 +141,53 @@ export async function createManifestAsync(
   return { conflictingVariableNames, manifest };
 }
 
+interface RawSourceMap {
+  version: number;
+  sources: string[];
+  names: string[];
+  sourceRoot?: string;
+  sourcesContent?: string[];
+  mappings: string;
+  file: string;
+}
+
+const sourceMapExtensionRe = /\.map$/;
+
+async function normalizeSourceMapAsync(
+  file: RecursiveFileEntry
+): Promise<WorkerFileEntry | undefined> {
+  // This logic normalizes source maps like Wrangler does
+  // See: https://github.com/cloudflare/workers-sdk/blob/508a1a3/packages/wrangler/src/deployment-bundle/source-maps.ts#L31-L63
+  const data = await fs.promises.readFile(file.path, 'utf-8');
+  try {
+    const map = JSON.parse(data) as RawSourceMap;
+    if (typeof map !== 'object' || !map) {
+      return undefined;
+    }
+    let sources = map.sources || [];
+    if (Array.isArray(map.sources)) {
+      // Remote null-byte prefixes from virtual file names
+      sources = map.sources.map(sourceName =>
+        sourceName.charCodeAt(0) === 0 ? sourceName.slice(1) : sourceName
+      );
+    }
+    return {
+      normalizedPath: file.normalizedPath,
+      path: file.path,
+      data: JSON.stringify({
+        version: 3,
+        file: file.normalizedPath.replace(sourceMapExtensionRe, ''),
+        sourcesContent: sources.map(() => null),
+        sources,
+        names: map.names,
+        mappings: map.mappings,
+      }),
+    };
+  } catch {
+    return undefined;
+  }
+}
+
 interface WorkerFileEntry {
   normalizedPath: string;
   path: string;
@@ -150,11 +197,18 @@ interface WorkerFileEntry {
 /** Reads worker files while normalizing sourcemaps and providing normalized paths */
 async function* listWorkerFilesAsync(workerPath: string): AsyncGenerator<WorkerFileEntry> {
   for await (const file of listFilesRecursively(workerPath)) {
-    yield {
-      normalizedPath: file.normalizedPath,
-      path: file.path,
-      data: await fs.promises.readFile(file.path),
-    };
+    if (file.normalizedPath.endsWith('.map')) {
+      const normalizedSourceMap = await normalizeSourceMapAsync(file);
+      if (normalizedSourceMap) {
+        yield normalizedSourceMap;
+      }
+    } else {
+      yield {
+        normalizedPath: file.normalizedPath,
+        path: file.path,
+        data: await fs.promises.readFile(file.path),
+      };
+    }
   }
 }