[rn] delete the legacy renderers from the sync (#34946)

Now that RN is only on the New Architecture, we can stop stop syncing
the legacy React Native renderers.

In this diff, I just stop syncing them. In a follow up I'll delete the
code for them so only Fabric is left.

This will also allow us to remove the `enableLegacyMode` feature flag.

.github/workflows/runtime_commit_artifacts.yml

@@ -162,10 +162,13 @@ jobs:
           mv build/facebook-react-native/react-is/cjs/ $BASE_FOLDER/RKJSModules/vendor/react/react-is/
           mv build/facebook-react-native/react-test-renderer/cjs/ $BASE_FOLDER/RKJSModules/vendor/react/react-test-renderer/
 
-          # Delete OSS renderer. OSS renderer is synced through internal script.
+          # Delete the OSS renderers, these are sync'd to RN separately.
           RENDERER_FOLDER=$BASE_FOLDER/react-native-github/Libraries/Renderer/implementations/
+          SHIM_FOLDER=$BASE_FOLDER/react-native-github/Libraries/Renderer/shims/
           rm $RENDERER_FOLDER/ReactFabric-{dev,prod,profiling}.js
-          rm $RENDERER_FOLDER/ReactNativeRenderer-{dev,prod,profiling}.js
+          
+          # Delete the legacy renderer shim, this is not sync'd and will get deleted in the future.
+          rm $SHIM_FOLDER/ReactNative.js
 
           # Copy eslint-plugin-react-hooks
           # NOTE: This is different from www, here we include the full package

packages/react-native-renderer/index.js

@@ -12,4 +12,5 @@ import * as ReactNative from './src/ReactNativeRenderer';
 // Assert that the exports line up with the type we're going to expose.
 (ReactNative: ReactNativeType);
 
+// TODO: Delete the legacy renderer, only Fabric is used now.
 export * from './src/ReactNativeRenderer';

packages/react-reconciler/README.md

@@ -59,7 +59,7 @@ The examples in the React repository are declared a bit differently than a third
 
 * [React ART](https://github.com/facebook/react/blob/main/packages/react-art/src/ReactART.js) and its [host config](https://github.com/facebook/react/blob/main/packages/react-art/src/ReactFiberConfigART.js)
 * [React DOM](https://github.com/facebook/react/blob/main/packages/react-dom/src/client/ReactDOM.js) and its [host config](https://github.com/facebook/react/blob/main/packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js)
-* [React Native](https://github.com/facebook/react/blob/main/packages/react-native-renderer/src/ReactNativeRenderer.js) and its [host config](https://github.com/facebook/react/blob/main/packages/react-native-renderer/src/ReactFiberConfigNative.js)
+* [React Native](https://github.com/facebook/react/blob/main/packages/react-native-renderer/src/ReactFabric.js) and its [host config](https://github.com/facebook/react/blob/main/packages/react-native-renderer/src/ReactFiberConfigFabric.js)
 
 If these links break please file an issue and we’ll fix them. They intentionally link to the latest versions since the API is still evolving. If you have more questions please file an issue and we’ll try to help!
 

scripts/rollup/bundles.js

@@ -819,42 +819,6 @@ const bundles = [
       }),
   },
 
-  /******* React Native *******/
-  {
-    bundleTypes: __EXPERIMENTAL__
-      ? []
-      : [RN_FB_DEV, RN_FB_PROD, RN_FB_PROFILING],
-    moduleType: RENDERER,
-    entry: 'react-native-renderer',
-    global: 'ReactNativeRenderer',
-    externals: ['react-native', 'ReactNativeInternalFeatureFlags'],
-    minifyWithProdErrorCodes: false,
-    wrapWithModuleBoundaries: true,
-    babel: opts =>
-      Object.assign({}, opts, {
-        plugins: opts.plugins.concat([
-          [require.resolve('@babel/plugin-transform-classes'), {loose: true}],
-        ]),
-      }),
-  },
-  {
-    bundleTypes: [RN_OSS_DEV, RN_OSS_PROD, RN_OSS_PROFILING],
-    moduleType: RENDERER,
-    entry: 'react-native-renderer',
-    global: 'ReactNativeRenderer',
-    // ReactNativeInternalFeatureFlags temporary until we land enableRemoveConsolePatches.
-    // Needs to be done before the next RN OSS release.
-    externals: ['react-native', 'ReactNativeInternalFeatureFlags'],
-    minifyWithProdErrorCodes: false,
-    wrapWithModuleBoundaries: true,
-    babel: opts =>
-      Object.assign({}, opts, {
-        plugins: opts.plugins.concat([
-          [require.resolve('@babel/plugin-transform-classes'), {loose: true}],
-        ]),
-      }),
-  },
-
   /******* React Native Fabric *******/
   {
     bundleTypes: __EXPERIMENTAL__

scripts/rollup/shims/react-native/ReactNative.js

@@ -14,6 +14,7 @@ import type {ReactNativeType} from './ReactNativeTypes';
 
 let ReactNative: ReactNativeType;
 
+// TODO: Delete the legacy renderer. Only ReactFabric is used now.
 if (__DEV__) {
   ReactNative = require('../implementations/ReactNativeRenderer-dev');
 } else {