[rcr] Remove runtimeModule compiler option

Now that the compiler always injects `react-compiler-runtime`, this
option is unnecessary.

ghstack-source-id: ec5ff3e
ghstack-comment-id: 2397700297
Pull Request resolved: #31145

Author: poteto

compiler/apps/playground/babel.config.js

@@ -9,13 +9,6 @@ module.exports = function (api) {
   api.cache(true);
   return {
     presets: ['next/babel'],
-    plugins: [
-      [
-        'babel-plugin-react-compiler',
-        {
-          runtimeModule: 'react-compiler-runtime',
-        },
-      ],
-    ],
+    plugins: [['babel-plugin-react-compiler']],
   };
 };

compiler/packages/babel-plugin-react-compiler/src/Entrypoint/Options.ts

@@ -87,17 +87,6 @@ export type PluginOptions = {
    */
   compilationMode: CompilationMode;
 
-  /*
-   * If enabled, Forget will import `useMemoCache` from the given module
-   * instead of `react/compiler-runtime`.
-   *
-   * ```
-   * // If set to "react-compiler-runtime"
-   * import {c as useMemoCache} from 'react-compiler-runtime';
-   * ```
-   */
-  runtimeModule?: string | null | undefined;
-
   /**
    * By default React Compiler will skip compilation of code that suppresses the default
    * React ESLint rules, since this is a strong indication that the code may be breaking React rules
@@ -214,7 +203,6 @@ export const defaultOptions: PluginOptions = {
   logger: null,
   gating: null,
   noEmit: false,
-  runtimeModule: null,
   eslintSuppressionRules: null,
   flowSuppressions: true,
   ignoreUseNoForget: false,

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/userspace-use-memo-cache.expect.md

@@ -48,7 +48,6 @@ function makePluginOptions(
   let enableEmitFreeze = null;
   let enableEmitHookGuards = null;
   let compilationMode: CompilationMode = 'all';
-  let runtimeModule = null;
   let panicThreshold: PanicThresholdOptions = 'all_errors';
   let hookPattern: string | null = null;
   // TODO(@mofeiZ) rewrite snap fixtures to @validatePreserveExistingMemo:false
@@ -104,10 +103,6 @@ function makePluginOptions(
       importSpecifierName: '$dispatcherGuard',
     };
   }
-  const runtimeModuleMatch = /@runtimeModule="([^"]+)"/.exec(firstLine);
-  if (runtimeModuleMatch) {
-    runtimeModule = runtimeModuleMatch[1];
-  }
 
   const targetMatch = /@target="([^"]+)"/.exec(firstLine);
   if (targetMatch) {
@@ -251,7 +246,6 @@ function makePluginOptions(
     gating,
     panicThreshold,
     noEmit: false,
-    runtimeModule,
     eslintSuppressionRules,
     flowSuppressions,
     ignoreUseNoForget,