Relocate manual .d.ts definitions under types_DEPRECATED/ (#57513)

Summary:
Pull Request resolved: #57513

See [**RFC0894: Removing deep imports from react-native**](react-native-community/discussions-and-proposals#894)

**Changes**

Rename the hand-written `types/` directory to `types_DEPRECATED/` and consolidate the co-located `.d.ts` declarations beneath it.

- This is a pure relocation with **no change** to the public type surface. The package `"exports"` map is updated so that every `types` condition resolves to the new location (`.` → `./types_DEPRECATED/index.d.ts`, `./Libraries/*` → `./types_DEPRECATED/Libraries/*.d.ts`) — consumers resolve the exact same types and runtime modules through the same import specifiers.
- Relative imports between the moved declarations, and the references from the moved `types/` files into `Libraries/`, were rewritten so the type graph continues to resolve.

**Downsides**

Risk of structural code drift if/when source modules in `Libraries/` move around.

**Counterpoint**: The aim here is to feature-lock the legacy JS API and remove deep `Libraries/` imports by projects.

Changelog: [Internal]

Differential Revision: D110602194

Author: huntie

packages/react-native/__typetests__/tsconfig.legacy.json

@@ -2,7 +2,7 @@
   "$schema": "https://json.schemastore.org/tsconfig",
   // Legacy variant: Opts into the `"react-native-legacy-deep-imports"` export
   // condition so `react-native` and `react-native/Libraries/*` resolve to the
-  // hand-written types in `types/`.
+  // hand-written types in `types_DEPRECATED/`.
   "extends": "./tsconfig.json",
   "compilerOptions": {
     "customConditions": ["react-native-legacy-deep-imports"]

packages/react-native/package.json

@@ -29,12 +29,12 @@
   "main": "./index.js",
   "exports": {
     ".": {
-      "react-native-legacy-deep-imports": "./types/index.d.ts",
+      "react-native-legacy-deep-imports": "./types_DEPRECATED/index.d.ts",
       "types": "./types_generated/index.d.ts",
       "default": "./index.js"
     },
     "./Libraries/*": {
-      "react-native-legacy-deep-imports": "./Libraries/*.d.ts",
+      "react-native-legacy-deep-imports": "./types_DEPRECATED/Libraries/*.d.ts",
       "types": null,
       "default": "./Libraries/*.js"
     },
@@ -128,7 +128,7 @@
     "src",
     "!src/private/testing",
     "third-party-podspecs",
-    "types",
+    "types_DEPRECATED",
     "types_generated",
     "!**/__docs__/**",
     "!**/__fixtures__/**",

packages/react-native/src/types/ErrorUtils.d.ts

@@ -0,0 +1,17 @@
+/**
+ * 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
+ */
+
+// From @react-native/js-polyfills
+
+type ErrorHandlerCallback = (error: any, isFatal?: boolean) => void;
+
+export interface ErrorUtils {
+  setGlobalHandler: (callback: ErrorHandlerCallback) => void;
+  getGlobalHandler: () => ErrorHandlerCallback;
+}

packages/react-native/src/types/globals.d.ts

@@ -7,7 +7,7 @@
  * @format
  */
 
-import type {ErrorUtils} from '../../Libraries/vendor/core/ErrorUtils';
+import type {ErrorUtils} from './ErrorUtils';
 
 declare global {
   interface NodeRequire {