As of version 2.13.0, Moment includes a typescript definition file.

Install via NPM

npm install moment

Import and use in your Typescript file

const moment = require('moment');

let now = moment().format('LLLL');

Note: If you have trouble importing moment

For Typescript 2.x try adding "moduleResolution": "node" in compilerOptions in your tsconfig.json file

For Typescript 1.x try adding "allowSyntheticDefaultImports": true in compilerOptions in your tsconfig.json file and then use the syntax

import moment from 'moment';

Locale Import

To use moment.locale you first need to import the language you are targeting.

import * as moment from 'moment';
import 'moment/locale/pt-br';

console.log(moment.locale()); // en
console.log(moment.locale()); // fr
console.log(moment.locale()); // pt-br