Update April 2017:

As of version 2.13.0, Moment includes a typescript definition file. https://momentjs.com/docs/#/use-it/typescript/

Just install it with npm, in your console type

npm install --save moment

And then in your Angular app, import is as easy as this:

import * as moment from 'moment';

That's it, you get full Typescript support!

Bonus edit: To type a variable or property as Moment in Typescript you can do this e.g.:

let myMoment: moment.Moment = moment("someDate");

moment is a third party global resource. The moment object lives on window in the browser. Therefor it is not correct to import it in your angular2 application. Instead include the <script> tag in your html that will load the moment.js file.

To make TypeScript happy you can add

declare var moment: any;

at the top of your files where you use it to stop the compilation errors, or you can use

///<reference path="./path/to/moment.d.ts" />

or use tsd to install the moment.d.ts file which TypeScript might find on it's own.

Example

import {Component} from 'angular2/core';
declare var moment: any;

@Component({
    selector: 'example',
    template: '<h1>Today is {{today}}</h1>'
})
export class ExampleComponent{
    today: string = moment().format('D MMM YYYY');
}

Just be sure to add the script tag in your html or moment won't exist.

<script src="node_modules/moment/moment.js" />

Module loading moment

First you would need to setup a module loader such as System.js to load the moment commonjs files

System.config({
    ...
    packages: {
        moment: {
            map: 'node_modules/moment/moment.js',
            type: 'cjs',
            defaultExtension: 'js'
        }
    }
});

Then to import moment into the file where needed use

import * as moment from 'moment';

or

import moment = require('moment');

EDIT:

There are also options with some bundlers such as Webpack or SystemJS builder or Browserify that will keep moment off of the window object. For more information on these, please visit their respective websites for instruction.

The following worked for me.

First, install the type definitions for moment.

typings install moment --save

(Note: NOT --ambient)

Then, to work around the lack of a proper export:

import * as moment from 'moment';