visitScope() — react Function Reference

Source Code

compiler/packages/babel-plugin-react-compiler/src/Validation/ValidateMemoizedEffectDependencies.ts lines 63–89

  override visitScope(
    scopeBlock: ReactiveScopeBlock,
    state: CompilerError,
  ): void {
    this.traverseScope(scopeBlock, state);

    /*
     * Record scopes that exist in the AST so we can later check to see if
     * effect dependencies which should be memoized (have a scope assigned)
     * actually are memoized (that scope exists).
     * However, we only record scopes if *their* dependencies are also
     * memoized, allowing a transitive memoization check.
     */
    let areDependenciesMemoized = true;
    for (const dep of scopeBlock.scope.dependencies) {
      if (isUnmemoized(dep.identifier, this.scopes)) {
        areDependenciesMemoized = false;
        break;
      }
    }
    if (areDependenciesMemoized) {
      this.scopes.add(scopeBlock.scope.id);
      for (const id of scopeBlock.scope.merged) {
        this.scopes.add(id);
      }
    }
  }