diff --git a/.flowconfig b/.flowconfig
index 33eeb5ccf9..05e86b299d 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -1,6 +1,6 @@
 [ignore]
 <PROJECT_ROOT>/packages/.*/build/.*
-<PROJECT_ROOT>/\.hg/.*
+<PROJECT_ROOT>/\.\(hg\|sl\|git\)/.*
 # this transient dep bundles tests with their package, which flow attempts to parse
 # and crashes out as the test includes purposely malformed json
 <PROJECT_ROOT>\(/.*\)?/node_modules/resolve/test/.*
diff --git a/packages/metro-babel-transformer/src/index.js b/packages/metro-babel-transformer/src/index.js
index 0e0a292980..4a6eb8aa8d 100644
--- a/packages/metro-babel-transformer/src/index.js
+++ b/packages/metro-babel-transformer/src/index.js
@@ -25,7 +25,7 @@ type BabelTransformOptions = NonNullable<
 >;
 
 export type CustomTransformOptions = {
-  [string]: unknown,
+  [key: string]: unknown,
   __proto__: null,
   ...
 };
@@ -80,7 +80,7 @@ export type BabelTransformerCacheKeyOptions = Readonly<{
 }>;
 
 export type BabelTransformer = Readonly<{
-  transform: BabelTransformerArgs => Readonly<{
+  transform: (transformerArgs: BabelTransformerArgs) => Readonly<{
     ast: BabelNodeFile,
     // Deprecated, will be removed in a future breaking release. Function maps
     // will be generated by an input Babel plugin instead and written into
@@ -92,12 +92,10 @@ export type BabelTransformer = Readonly<{
   getCacheKey?: (options?: BabelTransformerCacheKeyOptions) => string,
 }>;
 
-function transform({
-  filename,
-  options,
-  plugins,
-  src,
-}: BabelTransformerArgs): ReturnType<BabelTransformer['transform']> {
+function transform(
+  opts: BabelTransformerArgs,
+): ReturnType<BabelTransformer['transform']> {
+  const {filename, options, plugins, src} = opts;
   const OLD_BABEL_ENV = process.env.BABEL_ENV;
   process.env.BABEL_ENV = options.dev
     ? 'development'
diff --git a/packages/metro-babel-transformer/types/index.d.ts b/packages/metro-babel-transformer/types/index.d.ts
index b77f422ac3..2a38a188d4 100644
--- a/packages/metro-babel-transformer/types/index.d.ts
+++ b/packages/metro-babel-transformer/types/index.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<c71ff6c13c916919d1340d231518de8f>>
+ * @generated SignedSource<<2503f88efd80b39e4d860870017af66d>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-babel-transformer/src/index.js
@@ -24,7 +24,7 @@ type BabelTransformOptions = NonNullable<
   Parameters<typeof transformFromAstSync>[2]
 >;
 export type CustomTransformOptions = {
-  [$$Key$$: string]: unknown;
+  [key: string]: unknown;
 };
 export type TransformProfile = 'default' | 'hermes-stable' | 'hermes-canary';
 type BabelTransformerOptions = Readonly<{
@@ -85,7 +85,7 @@ export type BabelTransformerCacheKeyOptions = Readonly<{
   enableBabelRCLookup?: boolean;
 }>;
 export type BabelTransformer = Readonly<{
-  transform: ($$PARAM_0$$: BabelTransformerArgs) => Readonly<{
+  transform: (transformerArgs: BabelTransformerArgs) => Readonly<{
     ast: BabelNodeFile;
     functionMap?: BabelFileFunctionMapMetadata;
     metadata?: MetroBabelFileMetadata;
@@ -93,7 +93,7 @@ export type BabelTransformer = Readonly<{
   getCacheKey?: (options?: BabelTransformerCacheKeyOptions) => string;
 }>;
 declare function transform(
-  $$PARAM_0$$: BabelTransformerArgs,
+  opts: BabelTransformerArgs,
 ): ReturnType<BabelTransformer['transform']>;
 /**
  * Generates a cache key component based on the user's Babel configuration files.
diff --git a/packages/metro-config/src/types.js b/packages/metro-config/src/types.js
index 1ebd07bc23..927e92c0e1 100644
--- a/packages/metro-config/src/types.js
+++ b/packages/metro-config/src/types.js
@@ -108,7 +108,7 @@ type ResolverConfigT = {
   dependencyExtractor: ?string,
   emptyModulePath: string,
   enableGlobalPackages: boolean,
-  extraNodeModules: {[name: string]: string, ...},
+  extraNodeModules: {[packageName: string]: string, ...},
   hasteImplModulePath: ?string,
   nodeModulesPaths: ReadonlyArray<string>,
   platforms: ReadonlyArray<string>,
@@ -139,7 +139,7 @@ type SerializerConfigT = {
     delta: DeltaResult<>,
   ) => unknown,
   getModulesRunBeforeMainModule: (entryFilePath: string) => Array<string>,
-  getPolyfills: ({platform: ?string, ...}) => ReadonlyArray<string>,
+  getPolyfills: (ctx: {platform: ?string, ...}) => ReadonlyArray<string>,
   getRunModuleStatement: (
     moduleId: number | string,
     globalPrefix: string,
@@ -178,10 +178,13 @@ type CacheStoresConfigT = ReadonlyArray<CacheStore<TransformResult<>>>;
 
 type ServerConfigT = {
   /** @deprecated */
-  enhanceMiddleware: (Middleware, MetroServer) => Middleware | Server,
+  enhanceMiddleware: (
+    middleware: Middleware,
+    server: MetroServer,
+  ) => Middleware | Server,
   forwardClientLogs: boolean,
   port: number,
-  rewriteRequestUrl: string => string,
+  rewriteRequestUrl: (url: string) => string,
   unstable_serverRoot: ?string,
   useGlobalHotkey: boolean,
   verifyConnections: boolean,
@@ -196,7 +199,7 @@ type ServerConfigT = {
 };
 
 type SymbolicatorConfigT = {
-  customizeFrame: ({
+  customizeFrame: (frame: {
     +file: ?string,
     +lineNumber: ?number,
     +column: ?number,
@@ -204,8 +207,8 @@ type SymbolicatorConfigT = {
     ...
   }) => ?{+collapse?: boolean} | Promise<?{+collapse?: boolean}>,
   customizeStack: (
-    Array<IntermediateStackFrame>,
-    unknown,
+    symbolicatedStack: Array<IntermediateStackFrame>,
+    extraData: unknown,
   ) => Array<IntermediateStackFrame> | Promise<Array<IntermediateStackFrame>>,
 };
 
@@ -230,7 +233,9 @@ type WatcherConfigT = {
 export type InputConfigT = Partial<
   Readonly<
     MetalConfigT & {
-      cacheStores: CacheStoresConfigT | (MetroCache => CacheStoresConfigT),
+      cacheStores:
+        | CacheStoresConfigT
+        | ((metroCache: MetroCache) => CacheStoresConfigT),
       resolver: Readonly<Partial<ResolverConfigT>>,
       server: Readonly<Partial<ServerConfigT>>,
       serializer: Readonly<Partial<SerializerConfigT>>,
diff --git a/packages/metro-config/types/types.d.ts b/packages/metro-config/types/types.d.ts
index 3d7a2daa0b..ea4838ef18 100644
--- a/packages/metro-config/types/types.d.ts
+++ b/packages/metro-config/types/types.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<9c62bc2ca711f9693edc135a382a382a>>
+ * @generated SignedSource<<45e0111f05ce2350b8be53c72dd0c8c7>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-config/src/types.js
@@ -97,7 +97,7 @@ type ResolverConfigT = {
   dependencyExtractor: null | undefined | string;
   emptyModulePath: string;
   enableGlobalPackages: boolean;
-  extraNodeModules: {[name: string]: string};
+  extraNodeModules: {[packageName: string]: string};
   hasteImplModulePath: null | undefined | string;
   nodeModulesPaths: ReadonlyArray<string>;
   platforms: ReadonlyArray<string>;
@@ -130,7 +130,7 @@ type SerializerConfigT = {
     delta: DeltaResult,
   ) => unknown;
   getModulesRunBeforeMainModule: (entryFilePath: string) => Array<string>;
-  getPolyfills: ($$PARAM_0$$: {
+  getPolyfills: (ctx: {
     platform: null | undefined | string;
   }) => ReadonlyArray<string>;
   getRunModuleStatement: (
@@ -178,12 +178,12 @@ type CacheStoresConfigT = ReadonlyArray<CacheStore<TransformResult>>;
 type ServerConfigT = {
   /** @deprecated */
   enhanceMiddleware: (
-    $$PARAM_0$$: Middleware,
-    $$PARAM_1$$: MetroServer,
+    middleware: Middleware,
+    server: MetroServer,
   ) => Middleware | Server;
   forwardClientLogs: boolean;
   port: number;
-  rewriteRequestUrl: ($$PARAM_0$$: string) => string;
+  rewriteRequestUrl: (url: string) => string;
   unstable_serverRoot: null | undefined | string;
   useGlobalHotkey: boolean;
   verifyConnections: boolean;
@@ -197,7 +197,7 @@ type ServerConfigT = {
       };
 };
 type SymbolicatorConfigT = {
-  customizeFrame: ($$PARAM_0$$: {
+  customizeFrame: (frame: {
     readonly file: null | undefined | string;
     readonly lineNumber: null | undefined | number;
     readonly column: null | undefined | number;
@@ -206,8 +206,8 @@ type SymbolicatorConfigT = {
     | (null | undefined | {readonly collapse?: boolean})
     | Promise<null | undefined | {readonly collapse?: boolean}>;
   customizeStack: (
-    $$PARAM_0$$: Array<IntermediateStackFrame>,
-    $$PARAM_1$$: unknown,
+    symbolicatedStack: Array<IntermediateStackFrame>,
+    extraData: unknown,
   ) => Array<IntermediateStackFrame> | Promise<Array<IntermediateStackFrame>>;
 };
 type WatcherConfigT = {
@@ -227,7 +227,7 @@ export type InputConfigT = Partial<
     MetalConfigT & {
       cacheStores:
         | CacheStoresConfigT
-        | (($$PARAM_0$$: MetroCache) => CacheStoresConfigT);
+        | ((metroCache: MetroCache) => CacheStoresConfigT);
       resolver: Readonly<Partial<ResolverConfigT>>;
       server: Readonly<Partial<ServerConfigT>>;
       serializer: Readonly<Partial<SerializerConfigT>>;
diff --git a/packages/metro-file-map/src/cache/DiskCacheManager.js b/packages/metro-file-map/src/cache/DiskCacheManager.js
index 6d687f6bc5..93af365036 100644
--- a/packages/metro-file-map/src/cache/DiskCacheManager.js
+++ b/packages/metro-file-map/src/cache/DiskCacheManager.js
@@ -50,10 +50,9 @@ export class DiskCacheManager implements CacheManager {
   #tryWrite: ?() => Promise<void>;
   #stopListening: ?() => void;
 
-  constructor(
-    {buildParameters}: CacheManagerFactoryOptions,
-    {autoSave = {}, cacheDirectory, cacheFilePrefix}: DiskCacheConfig,
-  ) {
+  constructor(opts: CacheManagerFactoryOptions, config: DiskCacheConfig) {
+    const {buildParameters} = opts;
+    const {autoSave = {}, cacheDirectory, cacheFilePrefix} = config;
     this.#cachePath = DiskCacheManager.getCacheFilePath(
       buildParameters,
       cacheFilePrefix,
@@ -103,12 +102,9 @@ export class DiskCacheManager implements CacheManager {
 
   async write(
     getSnapshot: () => CacheData,
-    {
-      changedSinceCacheRead,
-      eventSource,
-      onWriteError,
-    }: CacheManagerWriteOptions,
+    opts: CacheManagerWriteOptions,
   ): Promise<void> {
+    const {changedSinceCacheRead, eventSource, onWriteError} = opts;
     // Initialise a writer function using a promise queue to ensure writes are
     // sequenced.
     const tryWrite = (this.#tryWrite = () => {
diff --git a/packages/metro-file-map/src/flow-types.js b/packages/metro-file-map/src/flow-types.js
index 44d05dea4d..d17ae41878 100644
--- a/packages/metro-file-map/src/flow-types.js
+++ b/packages/metro-file-map/src/flow-types.js
@@ -96,7 +96,7 @@ export type ChangedFileMetadata = Readonly<{
 }>;
 
 export type ChangeEvent = Readonly<{
-  logger: ?RootPerfLogger,
+  logger?: ?RootPerfLogger,
   changes: ReadonlyFileSystemChanges<Readonly<ChangedFileMetadata>>,
   rootDir: string,
 }>;
@@ -110,7 +110,7 @@ export type ChangeEventMetadata = {
 export type Console = typeof global.console;
 
 export type CrawlerOptions = {
-  abortSignal: ?AbortSignal,
+  abortSignal?: ?AbortSignal,
   computeSha1: boolean,
   console: Console,
   extensions: ReadonlyArray<string>,
@@ -328,8 +328,8 @@ export interface FileSystem {
     mixedStartPath: string,
     subpath: string,
     opts: {
-      breakOnSegment: ?string,
-      invalidatedBy: ?Set<string>,
+      breakOnSegment?: ?string,
+      invalidatedBy?: ?Set<string>,
       subpathType: 'f' | 'd',
     },
   ): ?{
diff --git a/packages/metro-file-map/src/plugins/HastePlugin.js b/packages/metro-file-map/src/plugins/HastePlugin.js
index 1aed548c3b..76ded2f493 100644
--- a/packages/metro-file-map/src/plugins/HastePlugin.js
+++ b/packages/metro-file-map/src/plugins/HastePlugin.js
@@ -80,10 +80,11 @@ export default class HastePlugin
     this.#failValidationOnConflicts = options.failValidationOnConflicts;
   }
 
-  async initialize({
-    files,
-  }: FileMapPluginInitOptions<null, string | null>): Promise<void> {
+  async initialize(
+    opts: FileMapPluginInitOptions<null, string | null>,
+  ): Promise<void> {
     this.#perfLogger?.point('constructHasteMap_start');
+    const files = opts.files;
     let hasteFiles = 0;
     for (const {
       baseName,
diff --git a/packages/metro-file-map/types/cache/DiskCacheManager.d.ts b/packages/metro-file-map/types/cache/DiskCacheManager.d.ts
index 464e1daa5d..c519313ff4 100644
--- a/packages/metro-file-map/types/cache/DiskCacheManager.d.ts
+++ b/packages/metro-file-map/types/cache/DiskCacheManager.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<9cdec2a3b7a46f0a893dd5dc392a5294>>
+ * @generated SignedSource<<1276c0a64e0ad55f32baa402baf919da>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-file-map/src/cache/DiskCacheManager.js
@@ -30,10 +30,7 @@ type DiskCacheConfig = Readonly<{
   cacheDirectory?: null | undefined | string;
 }>;
 export declare class DiskCacheManager implements CacheManager {
-  constructor(
-    $$PARAM_0$$: CacheManagerFactoryOptions,
-    $$PARAM_1$$: DiskCacheConfig,
-  );
+  constructor(opts: CacheManagerFactoryOptions, config: DiskCacheConfig);
   static getCacheFilePath(
     buildParameters: BuildParameters,
     cacheFilePrefix?: null | undefined | string,
@@ -43,7 +40,7 @@ export declare class DiskCacheManager implements CacheManager {
   read(): Promise<null | undefined | CacheData>;
   write(
     getSnapshot: () => CacheData,
-    $$PARAM_1$$: CacheManagerWriteOptions,
+    opts: CacheManagerWriteOptions,
   ): Promise<void>;
   end(): Promise<void>;
 }
diff --git a/packages/metro-file-map/types/flow-types.d.ts b/packages/metro-file-map/types/flow-types.d.ts
index 16ca47efd9..7f079c6409 100644
--- a/packages/metro-file-map/types/flow-types.d.ts
+++ b/packages/metro-file-map/types/flow-types.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<b3646c81d37188726a1fc27777dcbede>>
+ * @generated SignedSource<<ffc6f9b096f7d4a23bbd86997a3044d6>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-file-map/src/flow-types.js
@@ -80,7 +80,7 @@ export type ChangedFileMetadata = Readonly<{
   modifiedTime?: null | undefined | number;
 }>;
 export type ChangeEvent = Readonly<{
-  logger: null | undefined | RootPerfLogger;
+  logger?: null | undefined | RootPerfLogger;
   changes: ReadonlyFileSystemChanges<Readonly<ChangedFileMetadata>>;
   rootDir: string;
 }>;
@@ -91,7 +91,7 @@ export type ChangeEventMetadata = {
 };
 export type Console = typeof global.console;
 export type CrawlerOptions = {
-  abortSignal: null | undefined | AbortSignal;
+  abortSignal?: null | undefined | AbortSignal;
   computeSha1: boolean;
   console: Console;
   extensions: ReadonlyArray<string>;
@@ -289,8 +289,8 @@ export interface FileSystem {
     mixedStartPath: string,
     subpath: string,
     opts: {
-      breakOnSegment: null | undefined | string;
-      invalidatedBy: null | undefined | Set<string>;
+      breakOnSegment?: null | undefined | string;
+      invalidatedBy?: null | undefined | Set<string>;
       subpathType: 'f' | 'd';
     },
   ): null | undefined | {absolutePath: string; containerRelativePath: string};
diff --git a/packages/metro-file-map/types/plugins/HastePlugin.d.ts b/packages/metro-file-map/types/plugins/HastePlugin.d.ts
index 71d6cbc263..90518d1b99 100644
--- a/packages/metro-file-map/types/plugins/HastePlugin.d.ts
+++ b/packages/metro-file-map/types/plugins/HastePlugin.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<3d1462ab2325a09553e02b69b5de84eb>>
+ * @generated SignedSource<<d1c8a8bc5a39d65b817f19d70211260b>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-file-map/src/plugins/HastePlugin.js
@@ -44,7 +44,7 @@ declare class HastePlugin
   readonly name: 'haste';
   constructor(options: HasteMapOptions);
   initialize(
-    $$PARAM_0$$: FileMapPluginInitOptions<null, string | null>,
+    opts: FileMapPluginInitOptions<null, string | null>,
   ): Promise<void>;
   getSerializableSnapshot(): null;
   getModule(
diff --git a/packages/metro-resolver/src/types.js b/packages/metro-resolver/src/types.js
index 69e5263e00..68b3485411 100644
--- a/packages/metro-resolver/src/types.js
+++ b/packages/metro-resolver/src/types.js
@@ -140,7 +140,7 @@ export type ResolutionContext = Readonly<{
    * @deprecated, prefer `fileSystemLookup`
    */
   doesFileExist: DoesFileExist,
-  extraNodeModules: ?{[string]: string, ...},
+  extraNodeModules: ?{[packageName: string]: string, ...},
 
   /** Is resolving for a development bundle. */
   dev: boolean,
@@ -239,6 +239,6 @@ export type CustomResolver = (
 
 export type CustomResolverOptions = {
   __proto__: null,
-  +[string]: unknown,
+  +[key: string]: unknown,
   ...
 };
diff --git a/packages/metro-resolver/types/types.d.ts b/packages/metro-resolver/types/types.d.ts
index 5adec82e58..660a348a26 100644
--- a/packages/metro-resolver/types/types.d.ts
+++ b/packages/metro-resolver/types/types.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<dc003cf249ff458402c66f8295b5c361>>
+ * @generated SignedSource<<2965eed049cf875ab378bf04468d4a24>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-resolver/src/types.js
@@ -120,7 +120,7 @@ export type ResolutionContext = Readonly<{
    * @deprecated, prefer `fileSystemLookup`
    */
   doesFileExist: DoesFileExist;
-  extraNodeModules: null | undefined | {[$$Key$$: string]: string};
+  extraNodeModules: null | undefined | {[packageName: string]: string};
   /** Is resolving for a development bundle. */
   dev: boolean;
   /**
@@ -206,5 +206,5 @@ export type CustomResolver = (
   platform: string | null,
 ) => Resolution;
 export type CustomResolverOptions = {
-  readonly [$$Key$$: string]: unknown;
+  readonly [key: string]: unknown;
 };
diff --git a/packages/metro-source-map/src/source-map.js b/packages/metro-source-map/src/source-map.js
index 224fc5c3c8..ddb0e8376b 100644
--- a/packages/metro-source-map/src/source-map.js
+++ b/packages/metro-source-map/src/source-map.js
@@ -35,7 +35,10 @@ export type MetroSourceMapSegmentTuple =
   | SourceMapping
   | GeneratedCodeMapping;
 
-export type HermesFunctionOffsets = {[number]: ReadonlyArray<number>, ...};
+export type HermesFunctionOffsets = {
+  [functionId: number]: ReadonlyArray<number>,
+  ...
+};
 
 export type FBSourcesArray = ReadonlyArray<?FBSourceMetadata>;
 export type FBSourceMetadata = [?FBSourceFunctionMap];
diff --git a/packages/metro-source-map/types/source-map.d.ts b/packages/metro-source-map/types/source-map.d.ts
index cadc3b0109..a35395abeb 100644
--- a/packages/metro-source-map/types/source-map.d.ts
+++ b/packages/metro-source-map/types/source-map.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<7303fe7149cb12d764c6106cdf4f49ee>>
+ * @generated SignedSource<<b0e1699311899ba629198227dd1cc9ce>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-source-map/src/source-map.js
@@ -36,7 +36,7 @@ export type MetroSourceMapSegmentTuple =
   | SourceMapping
   | GeneratedCodeMapping;
 export type HermesFunctionOffsets = {
-  [$$Key$$: number]: ReadonlyArray<number>;
+  [functionId: number]: ReadonlyArray<number>;
 };
 export type FBSourcesArray = ReadonlyArray<null | undefined | FBSourceMetadata>;
 export type FBSourceMetadata = [null | undefined | FBSourceFunctionMap];
diff --git a/packages/metro-transform-worker/src/index.js b/packages/metro-transform-worker/src/index.js
index 033a194a94..84a0b4b143 100644
--- a/packages/metro-transform-worker/src/index.js
+++ b/packages/metro-transform-worker/src/index.js
@@ -60,7 +60,7 @@ import nullthrows from 'nullthrows';
 const InternalInvalidRequireCallError =
   collectDependencies.InvalidRequireCallError;
 
-type MinifierConfig = Readonly<{[string]: unknown, ...}>;
+type MinifierConfig = Readonly<{[key: string]: unknown, ...}>;
 
 export type MinifierOptions = {
   code: string,
@@ -77,9 +77,9 @@ export type MinifierResult = {
   ...
 };
 
-export type Minifier = MinifierOptions =>
-  | MinifierResult
-  | Promise<MinifierResult>;
+export type Minifier = (
+  opts: MinifierOptions,
+) => MinifierResult | Promise<MinifierResult>;
 
 export type Type = 'script' | 'module' | 'asset';
 
diff --git a/packages/metro-transform-worker/types/index.d.ts b/packages/metro-transform-worker/types/index.d.ts
index ce18c8f5a5..5878494cfe 100644
--- a/packages/metro-transform-worker/types/index.d.ts
+++ b/packages/metro-transform-worker/types/index.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<165882da0b131608da36b1cbd00ecf28>>
+ * @generated SignedSource<<b02aee4e7171e25c0d986090d70c1825>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro-transform-worker/src/index.js
@@ -28,7 +28,7 @@ import type {TransformResultDependency} from 'metro/private/DeltaBundler';
 import type {AllowOptionalDependencies} from 'metro/private/DeltaBundler/types';
 import type {DynamicRequiresBehavior} from 'metro/private/ModuleGraph/worker/collectDependencies';
 
-type MinifierConfig = Readonly<{[$$Key$$: string]: unknown}>;
+type MinifierConfig = Readonly<{[key: string]: unknown}>;
 export type MinifierOptions = {
   code: string;
   map: null | undefined | BasicSourceMap;
@@ -38,7 +38,7 @@ export type MinifierOptions = {
 };
 export type MinifierResult = {code: string; map?: BasicSourceMap};
 export type Minifier = (
-  $$PARAM_0$$: MinifierOptions,
+  opts: MinifierOptions,
 ) => MinifierResult | Promise<MinifierResult>;
 export type Type = 'script' | 'module' | 'asset';
 export type JsTransformerConfig = Readonly<{
diff --git a/packages/metro/src/DeltaBundler/Serializers/sourceMapGenerator.js b/packages/metro/src/DeltaBundler/Serializers/sourceMapGenerator.js
index 6352fd41f5..e479b09672 100644
--- a/packages/metro/src/DeltaBundler/Serializers/sourceMapGenerator.js
+++ b/packages/metro/src/DeltaBundler/Serializers/sourceMapGenerator.js
@@ -19,7 +19,7 @@ export type SourceMapGeneratorOptions = Readonly<{
   excludeSource: boolean,
   processModuleFilter: (module: Module<>) => boolean,
   shouldAddToIgnoreList: (module: Module<>) => boolean,
-  getSourceUrl: ?(module: Module<>) => string,
+  getSourceUrl?: ?(module: Module<>) => string,
 }>;
 
 function getSourceMapInfosImpl(
diff --git a/packages/metro/src/DeltaBundler/types.js b/packages/metro/src/DeltaBundler/types.js
index d819ce149c..5b55ae2369 100644
--- a/packages/metro/src/DeltaBundler/types.js
+++ b/packages/metro/src/DeltaBundler/types.js
@@ -168,7 +168,7 @@ export type DeltaResult<T = MixedOutput> = {
 
 export type SerializerOptions = Readonly<{
   asyncRequireModulePath: string,
-  createModuleId: string => number,
+  createModuleId: (absolutePath: string) => number,
   dev: boolean,
   getRunModuleStatement: (
     moduleId: number | string,
@@ -176,15 +176,15 @@ export type SerializerOptions = Readonly<{
   ) => string,
   globalPrefix: string,
   includeAsyncPaths: boolean,
-  inlineSourceMap: ?boolean,
+  inlineSourceMap?: ?boolean,
   modulesOnly: boolean,
   processModuleFilter: (module: Module<>) => boolean,
   projectRoot: string,
   runBeforeMainModule: ReadonlyArray<string>,
   runModule: boolean,
   serverRoot: string,
-  shouldAddToIgnoreList: (Module<>) => boolean,
-  sourceMapUrl: ?string,
-  sourceUrl: ?string,
-  getSourceUrl: ?(Module<>) => string,
+  shouldAddToIgnoreList: (module: Module<>) => boolean,
+  sourceMapUrl?: ?string,
+  sourceUrl?: ?string,
+  getSourceUrl?: ?(module: Module<>) => string,
 }>;
diff --git a/packages/metro/src/Server.js b/packages/metro/src/Server.js
index d0f68a9eba..6aa06a2dc1 100644
--- a/packages/metro/src/Server.js
+++ b/packages/metro/src/Server.js
@@ -307,7 +307,7 @@ export default class Server {
 
   async build(
     bundleOptions: BundleOptions,
-    {withAssets}: BuildOptions = {},
+    buildOptions: BuildOptions = {},
   ): Promise<{
     code: string,
     map: string,
@@ -315,6 +315,7 @@ export default class Server {
     ...
   }> {
     const splitOptions = splitBundleOptions(bundleOptions);
+    const {withAssets} = buildOptions;
     const {
       entryFile,
       graphOptions,
@@ -591,9 +592,9 @@ export default class Server {
   }
 
   processRequest: (
-    IncomingMessage,
-    ServerResponse,
-    ((e: ?Error) => void),
+    req: IncomingMessage,
+    res: ServerResponse,
+    next: (e: ?Error) => void,
   ) => void = (
     req: IncomingMessage,
     res: ServerResponse,
diff --git a/packages/metro/src/index.flow.js b/packages/metro/src/index.flow.js
index 66bbe9d90e..73f1b63592 100644
--- a/packages/metro/src/index.flow.js
+++ b/packages/metro/src/index.flow.js
@@ -72,7 +72,7 @@ export type RunMetroOptions = {
 export type RunServerOptions = Readonly<{
   hasReducedPerformance?: boolean,
   host?: string,
-  onError?: (Error & {code?: string}) => void,
+  onError?: (err: Error & {code?: string}) => void,
   onReady?: (server: HttpServer | HttpsServer) => void,
   onClose?: () => void,
   secureServerOptions?: HttpsServerOptions,
@@ -114,9 +114,9 @@ export type RunBuildOptions = {
   minify?: boolean,
   output?: Readonly<{
     build: (
-      MetroServer,
-      RequestOptions,
-      void | BuildOptions,
+      server: MetroServer,
+      requestOptions: RequestOptions,
+      buildOptions?: BuildOptions,
     ) => Promise<{
       code: string,
       map: string,
@@ -124,13 +124,13 @@ export type RunBuildOptions = {
       ...
     }>,
     save: (
-      {
+      output: {
         code: string,
         map: string,
         ...
       },
-      OutputOptions,
-      (logMessage: string) => void,
+      opts: OutputOptions,
+      logger: (logMessage: string) => void,
     ) => Promise<unknown>,
     ...
   }>,
@@ -275,7 +275,9 @@ export const createConnectMiddleware = async function (
 
 export const runServer = async (
   config: ConfigT,
-  {
+  opts: RunServerOptions = {},
+): Promise<RunServerResult> => {
+  const {
     hasReducedPerformance = false,
     host,
     onError,
@@ -289,8 +291,7 @@ export const runServer = async (
     waitForBundler = false,
     websocketEndpoints: userWebsocketEndpoints = {},
     watch,
-  }: RunServerOptions = {},
-): Promise<RunServerResult> => {
+  } = opts;
   await earlyPortCheck(host, config.server.port);
 
   if (secure != null || secureCert != null || secureKey != null) {
@@ -421,7 +422,9 @@ export const runServer = async (
 
 export const runBuild = async (
   config: ConfigT,
-  {
+  opts: RunBuildOptions,
+): Promise<RunBuildResult> => {
+  const {
     assets = false,
     customResolverOptions = DEFAULTS.customResolverOptions,
     customTransformOptions = DEFAULTS.customTransformOptions,
@@ -439,8 +442,7 @@ export const runBuild = async (
     sourceMap = false,
     sourceMapUrl,
     unstable_transformProfile = DEFAULTS.unstable_transformProfile,
-  }: RunBuildOptions,
-): Promise<RunBuildResult> => {
+  } = opts;
   const metroServer = await runMetro(config, {
     watch: false,
   });
@@ -512,16 +514,16 @@ export const runBuild = async (
 
 export const buildGraph = async function (
   config: InputConfigT,
-  {
+  opts: BuildGraphOptions,
+): Promise<ReadOnlyGraph<>> {
+  const {
     customTransformOptions = Object.create(null),
     dev = false,
     entries,
     minify = false,
-    onProgress,
     platform = 'web',
     type = 'module',
-  }: BuildGraphOptions,
-): Promise<ReadOnlyGraph<>> {
+  } = opts;
   const mergedConfig = await getConfig(config);
 
   const bundler = new IncrementalBundler(mergedConfig);
diff --git a/packages/metro/src/lib/JsonReporter.js b/packages/metro/src/lib/JsonReporter.js
index 8480230950..7010f14d5b 100644
--- a/packages/metro/src/lib/JsonReporter.js
+++ b/packages/metro/src/lib/JsonReporter.js
@@ -19,7 +19,7 @@ export type SerializedError = {
   ...
 };
 
-export type SerializedEvent<TEvent extends {+[string]: unknown, ...}> =
+export type SerializedEvent<TEvent extends {+[prop: string]: unknown, ...}> =
   TEvent extends {
     error: Error,
     ...
@@ -31,7 +31,9 @@ export type SerializedEvent<TEvent extends {+[string]: unknown, ...}> =
       }
     : TEvent;
 
-export default class JsonReporter<TEvent extends {+[string]: unknown, ...}> {
+export default class JsonReporter<
+  TEvent extends {+[prop: string]: unknown, ...},
+> {
   _stream: Writable;
 
   constructor(stream: Writable) {
diff --git a/packages/metro/src/node-haste/DependencyGraph.js b/packages/metro/src/node-haste/DependencyGraph.js
index f1efe1b104..dce9510767 100644
--- a/packages/metro/src/node-haste/DependencyGraph.js
+++ b/packages/metro/src/node-haste/DependencyGraph.js
@@ -315,14 +315,14 @@ export default class DependencyGraph extends EventEmitter {
     resolverOptions: ResolverInputOptions,
 
     // TODO: Fold assumeFlatNodeModules into resolverOptions and add to graphId
-    {assumeFlatNodeModules}: {assumeFlatNodeModules: boolean} = {
+    extraOptions: {assumeFlatNodeModules: boolean} = {
       assumeFlatNodeModules: false,
     },
   ): BundlerResolution {
     const to = dependency.name;
     const isSensitiveToOriginFolder =
       // Resolution is always relative to the origin folder unless we assume a flat node_modules
-      !assumeFlatNodeModules ||
+      !extraOptions.assumeFlatNodeModules ||
       // Path requests are resolved relative to the origin folder
       to.includes('/') ||
       to === '.' ||
diff --git a/packages/metro/src/node-haste/DependencyGraph/ModuleResolution.js b/packages/metro/src/node-haste/DependencyGraph/ModuleResolution.js
index dddf7cb497..dbe99c0714 100644
--- a/packages/metro/src/node-haste/DependencyGraph/ModuleResolution.js
+++ b/packages/metro/src/node-haste/DependencyGraph/ModuleResolution.js
@@ -41,7 +41,7 @@ type Options = Readonly<{
   disableHierarchicalLookup: boolean,
   doesFileExist: DoesFileExist,
   emptyModulePath: string,
-  extraNodeModules: ?Object,
+  extraNodeModules: ?{[key: string]: string},
   fileSystemLookup: FileSystemLookup,
   getHasteModulePath: (name: string, platform: ?string) => ?string,
   getHastePackagePath: (name: string, platform: ?string) => ?string,
diff --git a/packages/metro/types/DeltaBundler/Serializers/sourceMapGenerator.d.ts b/packages/metro/types/DeltaBundler/Serializers/sourceMapGenerator.d.ts
index efd22ce36c..449b427cd5 100644
--- a/packages/metro/types/DeltaBundler/Serializers/sourceMapGenerator.d.ts
+++ b/packages/metro/types/DeltaBundler/Serializers/sourceMapGenerator.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<49bc83c20821024a7b77f5d5c3168d62>>
+ * @generated SignedSource<<83e75c5275e98f33f98748f11c0baa1f>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro/src/DeltaBundler/Serializers/sourceMapGenerator.js
@@ -23,7 +23,7 @@ export type SourceMapGeneratorOptions = Readonly<{
   excludeSource: boolean;
   processModuleFilter: (module: Module) => boolean;
   shouldAddToIgnoreList: (module: Module) => boolean;
-  getSourceUrl: null | undefined | ((module: Module) => string);
+  getSourceUrl?: null | undefined | ((module: Module) => string);
 }>;
 declare function sourceMapGenerator(
   modules: ReadonlyArray<Module>,
diff --git a/packages/metro/types/DeltaBundler/types.d.ts b/packages/metro/types/DeltaBundler/types.d.ts
index 0abc6e6a72..647c809190 100644
--- a/packages/metro/types/DeltaBundler/types.d.ts
+++ b/packages/metro/types/DeltaBundler/types.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<feddf9cb00d4a097d348531773c9f0bd>>
+ * @generated SignedSource<<048910a40e900e85a4a037e02d572843>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro/src/DeltaBundler/types.js
@@ -148,7 +148,7 @@ export type DeltaResult<T = MixedOutput> = {
 };
 export type SerializerOptions = Readonly<{
   asyncRequireModulePath: string;
-  createModuleId: ($$PARAM_0$$: string) => number;
+  createModuleId: (absolutePath: string) => number;
   dev: boolean;
   getRunModuleStatement: (
     moduleId: number | string,
@@ -156,15 +156,15 @@ export type SerializerOptions = Readonly<{
   ) => string;
   globalPrefix: string;
   includeAsyncPaths: boolean;
-  inlineSourceMap: null | undefined | boolean;
+  inlineSourceMap?: null | undefined | boolean;
   modulesOnly: boolean;
   processModuleFilter: (module: Module) => boolean;
   projectRoot: string;
   runBeforeMainModule: ReadonlyArray<string>;
   runModule: boolean;
   serverRoot: string;
-  shouldAddToIgnoreList: ($$PARAM_0$$: Module) => boolean;
-  sourceMapUrl: null | undefined | string;
-  sourceUrl: null | undefined | string;
-  getSourceUrl: null | undefined | (($$PARAM_0$$: Module) => string);
+  shouldAddToIgnoreList: (module: Module) => boolean;
+  sourceMapUrl?: null | undefined | string;
+  sourceUrl?: null | undefined | string;
+  getSourceUrl?: null | undefined | ((module: Module) => string);
 }>;
diff --git a/packages/metro/types/Server.d.ts b/packages/metro/types/Server.d.ts
index 52439a65ca..4284333e64 100644
--- a/packages/metro/types/Server.d.ts
+++ b/packages/metro/types/Server.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<58a8bc4229ee86a5c93af2ea51195b97>>
+ * @generated SignedSource<<f75172db274c5e5d6613ffbf6b52b59e>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro/src/Server.js
@@ -132,7 +132,7 @@ declare class Server {
   ): Promise<{code: string; map: string}>;
   build(
     bundleOptions: BundleOptions,
-    $$PARAM_1$$?: BuildOptions,
+    buildOptions?: BuildOptions,
   ): Promise<{code: string; map: string; assets?: ReadonlyArray<AssetData>}>;
   getRamBundleInfo(options: BundleOptions): Promise<RamBundleInfo>;
   getAssets(options: BundleOptions): Promise<ReadonlyArray<AssetData>>;
@@ -157,9 +157,9 @@ declare class Server {
     res: ServerResponse,
   ): Promise<void>;
   processRequest: (
-    $$PARAM_0$$: IncomingMessage,
-    $$PARAM_1$$: ServerResponse,
-    $$PARAM_2$$: (e: null | undefined | Error) => void,
+    req: IncomingMessage,
+    res: ServerResponse,
+    next: (e: null | undefined | Error) => void,
   ) => void;
   _parseOptions(url: string): BundleOptions;
   _rewriteAndNormalizeUrl(requestUrl: string): string;
diff --git a/packages/metro/types/index.d.ts b/packages/metro/types/index.d.ts
index 615d384576..e22094e424 100644
--- a/packages/metro/types/index.d.ts
+++ b/packages/metro/types/index.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<3c6460427c6760887187d6b16151c609>>
+ * @generated SignedSource<<9497564df95b6b4796afe059ee0af907>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro/src/index.flow.js
@@ -57,7 +57,7 @@ export type RunMetroOptions = Omit<
 export type RunServerOptions = Readonly<{
   hasReducedPerformance?: boolean;
   host?: string;
-  onError?: ($$PARAM_0$$: Error & {code?: string}) => void;
+  onError?: (err: Error & {code?: string}) => void;
   onReady?: (server: HttpServer | HttpsServer) => void;
   onClose?: () => void;
   secureServerOptions?: HttpsServerOptions;
@@ -92,18 +92,18 @@ export type RunBuildOptions = {
   minify?: boolean;
   output?: Readonly<{
     build: (
-      $$PARAM_0$$: MetroServer,
-      $$PARAM_1$$: RequestOptions,
-      $$PARAM_2$$: void | BuildOptions,
+      server: MetroServer,
+      requestOptions: RequestOptions,
+      buildOptions?: BuildOptions,
     ) => Promise<{
       code: string;
       map: string;
       assets?: ReadonlyArray<AssetData>;
     }>;
     save: (
-      $$PARAM_0$$: {code: string; map: string},
-      $$PARAM_1$$: OutputOptions,
-      $$PARAM_2$$: (logMessage: string) => void,
+      output: {code: string; map: string},
+      opts: OutputOptions,
+      logger: (logMessage: string) => void,
     ) => Promise<unknown>;
   }>;
   platform?: string;
@@ -159,17 +159,17 @@ export declare const createConnectMiddleware: (
 export declare type createConnectMiddleware = typeof createConnectMiddleware;
 export declare const runServer: (
   config: ConfigT,
-  $$PARAM_1$$?: RunServerOptions,
+  opts?: RunServerOptions,
 ) => Promise<RunServerResult>;
 export declare type runServer = typeof runServer;
 export declare const runBuild: (
   config: ConfigT,
-  $$PARAM_1$$: RunBuildOptions,
+  opts: RunBuildOptions,
 ) => Promise<RunBuildResult>;
 export declare type runBuild = typeof runBuild;
 export declare const buildGraph: (
   config: InputConfigT,
-  $$PARAM_1$$: BuildGraphOptions,
+  opts: BuildGraphOptions,
 ) => Promise<ReadOnlyGraph>;
 export declare type buildGraph = typeof buildGraph;
 type AttachMetroCLIOptions = {
diff --git a/packages/metro/types/lib/JsonReporter.d.ts b/packages/metro/types/lib/JsonReporter.d.ts
index 9d29f11125..4a32661cf7 100644
--- a/packages/metro/types/lib/JsonReporter.d.ts
+++ b/packages/metro/types/lib/JsonReporter.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<e7173f8dc5e076fd37b9a1cecd581f58>>
+ * @generated SignedSource<<90ed73fe10859679f83e619fd1f46f59>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro/src/lib/JsonReporter.js
@@ -23,16 +23,13 @@ export type SerializedError = {
   errors?: ReadonlyArray<SerializedError>;
   cause?: SerializedError;
 };
-export type SerializedEvent<
-  TEvent extends {readonly [$$Key$$: string]: unknown},
-> = TEvent extends {error: Error}
-  ? Omit<Omit<TEvent, 'error'>, keyof {error: SerializedError}> & {
-      error: SerializedError;
-    }
-  : TEvent;
-declare class JsonReporter<
-  TEvent extends {readonly [$$Key$$: string]: unknown},
-> {
+export type SerializedEvent<TEvent extends {readonly [prop: string]: unknown}> =
+  TEvent extends {error: Error}
+    ? Omit<Omit<TEvent, 'error'>, keyof {error: SerializedError}> & {
+        error: SerializedError;
+      }
+    : TEvent;
+declare class JsonReporter<TEvent extends {readonly [prop: string]: unknown}> {
   _stream: Writable;
   constructor(stream: Writable);
   /**
diff --git a/packages/metro/types/node-haste/DependencyGraph.d.ts b/packages/metro/types/node-haste/DependencyGraph.d.ts
index 150546b496..9a25d70378 100644
--- a/packages/metro/types/node-haste/DependencyGraph.d.ts
+++ b/packages/metro/types/node-haste/DependencyGraph.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<0ae2c74336868865b420d900a230cea7>>
+ * @generated SignedSource<<0e019739f58fd639818330cd537c5975>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro/src/node-haste/DependencyGraph.js
@@ -81,7 +81,7 @@ declare class DependencyGraph extends EventEmitter {
     dependency: TransformResultDependency,
     platform: string | null,
     resolverOptions: ResolverInputOptions,
-    $$PARAM_4$$?: {assumeFlatNodeModules: boolean},
+    extraOptions?: {assumeFlatNodeModules: boolean},
   ): BundlerResolution;
   doesFileExist: (filePath: string) => boolean;
   getHasteName(filePath: string): string;
diff --git a/packages/metro/types/node-haste/DependencyGraph/ModuleResolution.d.ts b/packages/metro/types/node-haste/DependencyGraph/ModuleResolution.d.ts
index 7b591bb816..0f118997cb 100644
--- a/packages/metro/types/node-haste/DependencyGraph/ModuleResolution.d.ts
+++ b/packages/metro/types/node-haste/DependencyGraph/ModuleResolution.d.ts
@@ -6,7 +6,7 @@
  *
  * @noformat
  * @oncall react_native
- * @generated SignedSource<<0024fd05b95efe19a24f9acc84ff474b>>
+ * @generated SignedSource<<8e4b0e22be79662d4a21e9241922409d>>
  *
  * This file was translated from Flow by scripts/generateTypeScriptDefinitions.js
  * Original file: packages/metro/src/node-haste/DependencyGraph/ModuleResolution.js
@@ -38,7 +38,7 @@ type Options = Readonly<{
   disableHierarchicalLookup: boolean;
   doesFileExist: DoesFileExist;
   emptyModulePath: string;
-  extraNodeModules: null | undefined | object;
+  extraNodeModules: null | undefined | {[key: string]: string};
   fileSystemLookup: FileSystemLookup;
   getHasteModulePath: (
     name: string,