[pull] main from facebook:main

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

@@ -151,6 +151,17 @@ export class ProgramContext {
     );
   }
 
+  removeMemoCacheImport(): void {
+    const moduleImports = this.imports.get(this.reactRuntimeModule);
+    if (moduleImports == null) {
+      return;
+    }
+    moduleImports.delete('c');
+    if (moduleImports.size === 0) {
+      this.imports.delete(this.reactRuntimeModule);
+    }
+  }
+
   /**
    *
    * @param externalFunction

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

@@ -775,6 +775,13 @@ function applyCompiledFunctions(
 
   // Forget compiled the component, we need to update existing imports of useMemoCache
   if (compiledFns.length > 0) {
+    // Codegen may have registered `_c` for a function that was later discarded.
+    const anyAppliedUsesMemo = compiledFns.some(
+      result => result.compiledFn.memoSlotsUsed > 0,
+    );
+    if (!anyAppliedUsesMemo) {
+      programContext.removeMemoCacheImport();
+    }
     addImportsToProgram(program, programContext);
   }
 }

compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/use-no-forget-multiple-with-eslint-suppression.expect.md

@@ -25,7 +25,6 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
 import { useRef } from "react";
 
 const useControllableState = (options) => {};