Repository: facebook/react
File: compiler/packages/babel-plugin-react-compiler/src/HIR/Environment.ts (TypeScript)

Code before:
        description: null,
        loc: null,
        suggestions: null,
      });
      this.#globals.set(
        hookName,
        addHook(this.#shapes, {
          positionalParams: [],
          restParam: hook.effectKind,
          returnType: hook.transitiveMixedData
            ? {kind: 'Object', shapeId: BuiltInMixedReadonlyId}
            : {kind: 'Poly'},
          returnValueKind: hook.valueKind,
          calleeEffect: Effect.Read,
          hookKind: 'Custom',
          noAlias: hook.noAlias,
        }),
      );
    }

    if (config.enableCustomTypeDefinitionForReanimated) {
      installReAnimatedTypes(
        this.#moduleTypes,
        this.#shapes,
        REANIMATED_MODULE_NAME,
      );
    }

    this.#contextIdentifiers = contextIdentifiers;
    this.#hoistedIdentifiers = new Set();
  }

  get nextIdentifierId(): IdentifierId {
    return makeIdentifierId(this.#nextIdentifer++);
  }

  get nextBlockId(): BlockId {
    return makeBlockId(this.#nextBlock++);
  }

  get nextScopeId(): ScopeId {
    return makeScopeId(this.#nextScope++);
  }

  isContextIdentifier(node: t.Identifier): boolean {
    return this.#contextIdentifiers.has(node);
  }

  isHoistedIdentifier(node: t.Identifier): boolean {
    return this.#hoistedIdentifiers.has(node);
  }

Review comment (suggestion):
Subtle design feedback here, but it's generally better to avoid mutating functions if possible. In this case, instead of `installReanimatedTypes()` this could be `buildReanimatedTypes()` which returns the same data type as moduleTypeResolver, and which we then install. 

Alternatively, we could just pass `#shapes` and then return a type, which the caller (here) adds to moduleTypes

Code after:
        description: null,
        loc: null,
        suggestions: null,
      });
      this.#globals.set(
        hookName,
        addHook(this.#shapes, {
          positionalParams: [],
          restParam: hook.effectKind,
          returnType: hook.transitiveMixedData
            ? {kind: 'Object', shapeId: BuiltInMixedReadonlyId}
            : {kind: 'Poly'},
          returnValueKind: hook.valueKind,
          calleeEffect: Effect.Read,
          hookKind: 'Custom',
          noAlias: hook.noAlias,
        }),
      );
    }

    if (config.enableCustomTypeDefinitionForReanimated) {
      const reanimatedModuleType = getReanimatedModuleType(this.#shapes);
      this.#moduleTypes.set(REANIMATED_MODULE_NAME, reanimatedModuleType);
    }

    this.#contextIdentifiers = contextIdentifiers;
    this.#hoistedIdentifiers = new Set();
  }

  get nextIdentifierId(): IdentifierId {
    return makeIdentifierId(this.#nextIdentifer++);
  }

  get nextBlockId(): BlockId {
    return makeBlockId(this.#nextBlock++);
  }

  get nextScopeId(): ScopeId {
    return makeScopeId(this.#nextScope++);
  }

  isContextIdentifier(node: t.Identifier): boolean {
    return this.#contextIdentifiers.has(node);
  }

  isHoistedIdentifier(node: t.Identifier): boolean {
    return this.#hoistedIdentifiers.has(node);
  }

  generateGloballyUniqueIdentifierName(
    name: string | null,