Enhance the type declarations in Angular using TypeScript

I have been working on creating a TypeScript definition file for the angular-q-extras library

You can view the full definition file I have written here

This definition file includes a few methods added to the IQService interface:

declare var _: string;
export = _;

import * as angular from 'angular';

declare module 'angular' {
    namespace angular {

        interface IQService {
            allSettled(promises): IPromise<any>;
        }  

    }
}

My approach is heavily influenced by existing Angular plugin definitions.

However, when running the DefinitelyTyped linter or when trying to use the definition, I encounter the following error:

Cannot augment module 'angular' with value exports because it resolves to a non-module entity.

Additionally, I get numerous errors like:

Cannot find name 'IPromise'.

I am puzzled as to why this is causing issues for my definition but not for others. I must have overlooked something obvious, but I am unable to pinpoint what it is.

angulartypescriptpromisetype-declaration

Answer №1

Regarding:

Issue with extending module 'angular' with exports due to it being a non-module entity.

The Angular type definition states:

declare var angular: angular.IAngularStatic;
export = angular;

Therefore, you cannot add additional items like angular.foo.bar that would conflict with the declared angular variable already in place. It seems that the qextras.PromiseState enum is not defined at runtime under this exact name by angular-q-extras, so it would be misleading to declare it as such. You could define a type instead:

type PromiseState = 'fulfilled' | 'rejected';

Using a const enum might seem like a solution as it is removed during TypeScript compilation, but there are concerns about ambiguity with the const enum and the angular variable at compile time. The errors related to IPromise may be due to issues with the declare module 'angular'.

Additionally, it appears that the namespace angular around IQService should be removed as well. Your augmentation should align with what the Angular type declaration specifies as the export, without nesting another namespace angular.

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