What is the process for importing from a `.d.ts` file?

This code snippet is functioning properly in a project built with angular2 RC4

import * as mapTypes from '../../../../node_modules/angular2-google-maps/core/services/google-maps-types.d.ts';

What could be causing this issue?

Now, when attempting to use the same line of code in a new seed file with RC6, an error is thrown:

error TS2691: An import path cannot end with a '.d.ts' extension. Consider importing '../../../../node_modules/angular2-google-maps/core/services/google-maps-types' instead.

However, if I make the suggested modification, I encounter:

Cannot find module '../../../../node_modules/angular2-google-maps/core/services/google-maps-types'

The contents of the .d.ts file are as follows:

/**
 * angular2-google-maps - Angular 2 components for Google Maps
 * @version v0.12.0
 * @link https://github.com/SebastianM/angular2-google-maps#readme
 * @license MIT
 */
export declare var google: any;
export interface GoogleMap {
    constructor(el: HTMLElement, opts?: MapOptions): void;
    panTo(latLng: LatLng | LatLngLiteral): void;
    setZoom(zoom: number): void;
    addListener(eventName: string, fn: Function): void;
    getCenter(): LatLng;
    setCenter(latLng: LatLng | LatLngLiteral): void;
    getBounds(): LatLngBounds;
    getZoom(): number;
    setOptions(options: MapOptions): void;
}
...

and the corresponding .ts file looks like this:

/**
 * angular2-google-maps - Angular 2 components for Google Maps
 * @version v0.12.0
 * @link https://github.com/SebastianM/angular2-google-maps#readme
 * @license MIT
 */
"use strict";

//# sourceMappingURL=google-maps-types.js.map

NOTE: Although there is a newer version of this package designed for RC6, I am determined to make this current version compile successfully in TypeScript

Answer №1

If you are using the most recent versions of TypeScript and have the typing definition included in your npm package, you can simply import from the module like this:

import { GoogleMap } from 'angular2-google-maps/core/services/google-maps-types'

Even if it is just an interface.

In reality, when you import from

core/services/googles-maps-types.js
, you are actually importing the definition that is associated with its .d.ts file.

This setup allows it to function as if you were directly importing from a .ts file, but since you are within an npm module, they include the definition file for easy imports.

Answer №2

Typically, in TypeScript, you would include a reference to the definition file at the beginning of your .ts file as shown below:

/// <reference path="../../../../node_modules/angular2-google-maps/core/services/google-maps-types.d.ts"

Once you have done that, you can start importing items from the definition file.

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