Question

我试图在winston（节点登录框架）中包含一个函数/方法，我找到了它的接口

interface LeveledLogMethod {
    (msg: string, callback: LogCallback): LoggerInstance;
    (msg: string, meta: any, callback: LogCallback): LoggerInstance;
    (msg: string, ...meta: any[]): LoggerInstance;
}

我想实现一个名为“error”的方法，该方法将采用上述签名。

我只包装它，所以我将直接调用winston函数。

如果有人熟悉winston，我基本上有2个记录器设置，所有消费者都通过我的主要loglog类，我使用第一个记录器或第二个记录器，具体取决于loglevel，所以我需要包装它。

Answer 1

You can use optional properties and types to add that to your function so it matches the interface.

For example:

interface LeveledLogMethod {
    (msg: string, callback: () => void): string;
    (msg: string, meta: any, callback: () => void): string;
    (msg: string, ...meta: any[]): string;
}

let error: LeveledLogMethod = function (msg: string, b: () => void | any, c?: () => void): string {
    return '';
}

Answer 2

Use 3 interfaces this way:

interface A {}
interface B {}
interface C {}

const variable: A|B|C = {};

打字稿：实现具有3种不同签名的界面的方法？

2 个答案: