CODEWITHSUNDEEP
typescript
Poul K. Sørensen
Poul K. Sørensen

Reputation: 17530

Do TypeScript interfaces need to be defined in d.ts files?

I am writing a TypeScript class:

export class Test
{
    property : string;
}

I want to extend the Knockout interface, KnockoutObservable like for String, Bool that are already in Knockout.d.ts;

export declare interface KnockoutObservableTest extends KnockoutObservableBase
{
    ...
}

If I have the interface in my Test.ts file together with the class I cant get it working. if I put it in a separate App.d.ts file and reference it, it seems to work.

My test is

var value : KnockoutObservableTest;

Wondering why it have to be in a d.ts file, or maybe there is something I do not know ?

Upvotes: 2

Views: 1068

Answers (1)

Poul K. Sørensen
Poul K. Sørensen

Reputation: 17530

When loading it from the same file as the Test.ts with...

import TestModel = module('Test');

... the interface is declared in TestModel.KnockoutObservableTest in contrast to just being in the root scope when references a .d.ts file.

Upvotes: 1

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