forwardRef
在下面的例子当中 Person
先于 Father
声明,但是又依赖于 Father
,这种情况下,你需要使用 forwardRef
来封装一次 Father
,否则 redi 在记录依赖关系时, Father
的值会是 undefined
。如果这种情况确实发生了,redi 会报错。
import { Self, SkipSelf } from "@wendellhu/redi";
class Person {
constructor(
@Self() @Inject(forwardRef(() => Father)) private readonly father: Father,
@SkipSelf()
@Inject(forwardRef(() => Father))
private readonly grandfather: Father,
) {}
}
class Man extends Person {}
class Father extends Man {
changeDiaper(): void {}
}
💡
这和 TypeScript 如何编译 class 有关。在装饰器执行时,Father
类所对应的标识符的值是 undefined
。