如何在TypeScript装饰器中获取类型数据？

问题描述

我想访问要修饰的变量声明的类型信息：

I would like to be access the type information on a variable declaration that I want to decorate:

@decorator
foo: Foo;

我可以从装饰器中以某种方式访问​​ Foo ？

From the decorator, can I somehow access Foo?

推荐答案

您应该可以做到，但是您需要使用。

You should be able to do it, but you'll need to use reflect-metadata.

这里有一个示例：，这似乎正是您所追求的：

There's an example here: Decorators & metadata reflection in TypeScript: From Novice to Expert which seems to be exactly what you're after:

function logType(target : any, key : string) {
    var t = Reflect.getMetadata("design:type", target, key);
    console.log(`${key} type: ${t.name}`);
}

class Demo{ 
    @logType
    public attr1: string;
}

应打印：

attr1类型：字符串

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