How to add declare to existing object (typing augmentation) in typescript

Question

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

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

import _ = require('lodash');

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

krontogiannis · Accepted Answer · 2016-05-23 19:51:32Z

0

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)

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

answered May 23, 2016 at 19:51

krontogiannis

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1 Comment

Denis535 Over a year ago

Now I'm doing so. But I want without new variable.

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