如何在打字稿中向现有对象添加声明(打字增强) [英] How to add declare to existing object (typing augmentation) in typescript

问题描述

上一个版本的 lodash 现在有一些新功能.例如:https://lodash.com/docs#nth.

Last version of lodash now has a few new functions. For example: https://lodash.com/docs#nth.

但是 lodash 类型适用于旧版本并且没有这些功能.

But lodash typings are for old version and hasn't those functions.

import _ = require('lodash');

如何将这些函数的声明添加到 _ 对象中?

How I can add declaration of those functions to _ object?

推荐答案

如果你检查你的 Typings 文件，你可以看到你可以扩展的基本 LoDashStatic 接口:

If you check your typings file you can see the basic LoDashStatic interface that you can extend:

import old = require('lodash')

interface LodashExt extends old.LoDashStatic {
    nth(n: Array<any>, i: number) : LodashExt
    // . . .
}

var _ = <LodashExt>old

_.add(1, 2)

_.nth(['a', 'b', 'c', 'd'], 2)

对于简单的情况，这应该足够了.您可能希望将上述声明放入一个模块中，然后导出新的 _ 值.

That should be enough for simple cases. You might want to put the above declarations to a module and just export your new _ value.

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