JSVoid 类型定义

JSVoid = void

JS 类型与 undefined 的等效类型，用于互操作成员的返回类型。

建议使用 void 而不是这个定义。

实现

// TODO(srujzs): Mark this as deprecated. There are no performance costs from
// using `void`, and we'll likely provide a different way to box `undefined`.
typedef JSVoid = JSVoidRepType;