Function objects in Typescript d.ts

Question

I am trying to map a library (not written by me) to a .d.ts file. It has an object that is a function but that has properties (some of them also functions), like this:

var asd = function () { return 1; };
asd.two = function () { return 2; };
asd.three = 'three';

How can I write the type of asd in a .d.ts file? How to specify that it is a function that returns a number and that has two properties, one a function returning a number and one that is a string

Possible duplicate of build a function object with properties in typescript — mk.
– mk., Commented Jan 29, 2016 at 14:54
@mk. I think that question is slightly different because it's not about definition files, but I do believe I saw this question somewhere else before... I just can't find it. — David Sherret
– David Sherret, Commented Jan 29, 2016 at 15:00
@DavidSherret Yep, you're right, it's not exact, though the answers are just about the same except for declare. I updated my answer in that other question to cover .d.ts files. — mk.
– mk., Commented Jan 29, 2016 at 15:21

Kinrany · Accepted Answer · 2018-04-29 16:35:46Z

5

Use declaration merging:

declare function asd(): number;

declare module asd {
    function two(): number;
    var three: string;
}

Tests:

let num: number = asd();
num = asd.two();
asd.three = "str";

edited Apr 29, 2018 at 16:35

Kinrany

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answered Jan 29, 2016 at 14:51

David Sherret

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