Fix hyper-annoying importFile.worker.worker.js warning on startup

Summary:
Gets rid of

 {F1074904830}

See D48603710 for some more information.

This patches the bundle which includes the reference to silence the error.

Changelog: No longer show importFile.worker.worker.js warning on startup

Reviewed By: lblasa

Differential Revision: D48605129

fbshipit-source-id: 20dc292191742400c8c390a75b1e53f11630ad5a

desktop/plugins/public/reactdevtools/scripts/remove-sourcemap-reference.tsx

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+/* eslint-disable no-restricted-imports */
+
+/*
+ * This script attempts to get rid of a sourcemap reference in react-devtools-frontend
+ * that is causing a rather annoying non-fetal error at Flipper startup.
+ *
+ * It will gracefully fail as Flipper will still work without it, just show the error again.
+ */
+
+import fs from 'fs-extra';
+import path from 'path';
+
+const SOURCEMAP_REFERENCE =
+  '//# sourceMappingURL=importFile.worker.worker.js.map';
+
+// Remove this once we're upgrade to a newer JS version. String.prototype.replaceAll is a thing.
+function replaceAll(s: string, find: string, replace: string): string {
+  return s.replace(
+    new RegExp(find.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), 'g'),
+    replace,
+  );
+}
+
+async function main() {
+  const frontendPath = path.resolve(
+    __dirname,
+    '../../node_modules/react-devtools-inline/dist/frontend.js',
+  );
+  console.log(`Looking up ${frontendPath} for patching ...`);
+  // Check if path exists
+  if (!(await fs.pathExists(frontendPath))) {
+    console.warn('react-devtools-inline frontend not found, skipping patching');
+    return 0;
+  }
+
+  const content = await fs.readFile(frontendPath, 'utf-8');
+  if (!content.includes(SOURCEMAP_REFERENCE)) {
+    console.log('react-devtools-inline appears to already be patched.');
+    return 0;
+  }
+
+  await fs.writeFile(
+    frontendPath,
+    replaceAll(content, SOURCEMAP_REFERENCE, ''),
+  );
+
+  console.log('react-devtools-inline patched successfully.');
+  return 0;
+}
+
+(async () => {
+  process.exit(await main());
+})();