chore(types): auto-generate types for metro-file-map

Author: nickhudkins

packages/metro-config/src/defaults/index.js

@@ -175,7 +175,6 @@ const getDefaultValues = (projectRoot: ?string): ConfigT => ({
 async function getDefaultConfig(rootPath: ?string): Promise<ConfigT> {
   // We can add more logic here to get a sensible default configuration, for
   // now we just return a stub.
-
   return getDefaultValues(rootPath);
 }
 

packages/metro-file-map/package.json

@@ -29,7 +29,8 @@
     "walker": "^1.0.7"
   },
   "devDependencies": {
-    "slash": "^3.0.0"
+    "slash": "^3.0.0",
+    "metro-babel-register": "0.83.3"
   },
   "engines": {
     "node": ">=20.19.4"

packages/metro-file-map/src/constants.flow.js

@@ -0,0 +1,54 @@
+/**
+ * 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.
+ *
+ * @flow strict-local
+ * @noformat - Flow comment syntax
+ */
+
+/* eslint-disable import/no-commonjs */
+
+/*
+ * This file exports a set of constants that are used for Jest's haste map
+ * serialization. On very large repositories, the haste map cache becomes very
+ * large to the point where it is the largest overhead in starting up Jest.
+ *
+ * This constant key map allows to keep the map smaller without having to build
+ * a custom serialization library.
+ */
+
+
+import type {HType} from './flow-types';
+
+
+'use strict';
+
+export const constants: HType = {
+  /* dependency serialization */
+  DEPENDENCY_DELIM: '\0',
+
+  /* file map attributes */
+  MTIME: 0,
+  SIZE: 1,
+  VISITED: 2,
+  DEPENDENCIES: 3,
+  SHA1: 4,
+  SYMLINK: 5,
+  ID: 6,
+
+  /* module map attributes */
+  PATH: 0,
+  TYPE: 1,
+
+  /* module types */
+  MODULE: 0,
+  PACKAGE: 1,
+
+  /* platforms */
+  GENERIC_PLATFORM: 'g',
+  NATIVE_PLATFORM: 'native',
+};
+
+export default constants as HType;

packages/metro-file-map/src/constants.js

@@ -5,50 +5,20 @@
  * LICENSE file in the root directory of this source tree.
  *
  * @flow strict-local
- * @noformat - Flow comment syntax
+ * @format
+ * @oncall react_native
  */
 
 /* eslint-disable import/no-commonjs */
 
-/*
- * This file exports a set of constants that are used for Jest's haste map
- * serialization. On very large repositories, the haste map cache becomes very
- * large to the point where it is the largest overhead in starting up Jest.
- *
- * This constant key map allows to keep the map smaller without having to build
- * a custom serialization library.
- */
+'use strict';
 
 /*::
-import type {HType} from './flow-types';
+export type * from './constants.flow';
 */
 
-'use strict';
-
-const constants/*: HType */ = {
-  /* dependency serialization */
-  DEPENDENCY_DELIM: '\0',
-
-  /* file map attributes */
-  MTIME: 0,
-  SIZE: 1,
-  VISITED: 2,
-  DEPENDENCIES: 3,
-  SHA1: 4,
-  SYMLINK: 5,
-  ID: 6,
-
-  /* module map attributes */
-  PATH: 0,
-  TYPE: 1,
-
-  /* module types */
-  MODULE: 0,
-  PACKAGE: 1,
-
-  /* platforms */
-  GENERIC_PLATFORM: 'g',
-  NATIVE_PLATFORM: 'native',
-};
+try {
+  require('metro-babel-register').unstable_registerForMetroMonorepo();
+} catch {}
 
-module.exports = constants;
+module.exports = require('./constants.flow');

packages/metro-file-map/src/flow-types.js

@@ -187,7 +187,9 @@ export type FileMapPluginInitOptions<SerializableState> = $ReadOnly<{
   pluginState: ?SerializableState,
 }>;
 
-type V8Serializable = interface {};
+// While I could use `interface {}`, this does not translate nicely to TypeScript.
+// $FlowFixMe[unclear-type] - using Object type here to represent an arbitrary object
+type V8Serializable = Object;
 
 export interface FileMapPlugin<SerializableState = V8Serializable> {
   +name: string;
@@ -472,4 +474,4 @@ export type WorkerMetadata = $ReadOnly<{
   content?: ?Buffer,
 }>;
 
-export type WorkerSetupArgs = $ReadOnly<{}>;
+export type WorkerSetupArgs = $ReadOnly<Record<string, mixed>>;

packages/metro-file-map/src/index.js

@@ -40,7 +40,7 @@ import type {
 } from './flow-types';
 
 import {DiskCacheManager} from './cache/DiskCacheManager';
-import H from './constants';
+import H from './constants.flow';
 import checkWatchmanCapabilities from './lib/checkWatchmanCapabilities';
 import {FileProcessor} from './lib/FileProcessor';
 import normalizePathSeparatorsToPosix from './lib/normalizePathSeparatorsToPosix';

packages/metro-file-map/src/lib/FileProcessor.js

@@ -17,8 +17,8 @@ import type {
   WorkerSetupArgs,
 } from '../flow-types';
 
-import H from '../constants';
-import {Worker} from '../worker';
+import H from '../constants.flow';
+import {Worker} from '../worker.flow';
 import {Worker as JestWorker} from 'jest-worker';
 import {sep} from 'path';
 

packages/metro-file-map/src/lib/TreeFS.js

@@ -19,7 +19,7 @@ import type {
   ProcessFileFunction,
 } from '../flow-types';
 
-import H from '../constants';
+import H from '../constants.flow';
 import {RootPathUtils} from './RootPathUtils';
 import invariant from 'invariant';
 import path from 'path';

packages/metro-file-map/src/lib/__tests__/FileProcessor-test.js

@@ -15,7 +15,7 @@ import type {
   WorkerMetadata,
 } from '../../flow-types';
 
-import H from '../../constants';
+import H from '../../constants.flow';
 
 const MockJestWorker = jest.fn().mockImplementation(() => ({
   processFile: async () => ({}),

packages/metro-file-map/src/lib/__tests__/TreeFS-test.js

@@ -12,7 +12,7 @@
 import type {CanonicalPath, FileData, FileMetadata} from '../../flow-types';
 import type TreeFSType from '../TreeFS';
 
-import H from '../../constants';
+import H from '../../constants.flow';
 
 let mockPathModule;
 jest.mock('path', () => mockPathModule);