npm install moment
var moment = require('moment');

Note: By default, webpack bundles all Moment.js locales (in Moment.js 2.18.1, that’s 160 minified KBs). To strip unnecessary locales and bundle only the used ones, add moment-locales-webpack-plugin:

// webpack.config.js
const MomentLocalesPlugin = require('moment-locales-webpack-plugin');

module.exports = {
    plugins: [
        // To strip all locales except “en”
        new MomentLocalesPlugin(),

        // Or: To strip all locales except “en”, “es-us” and “ru”
        // (“en” is built into Moment and can’t be removed)
        new MomentLocalesPlugin({
            localesToKeep: ['es-us', 'ru'],

There are other resources to optimize Moment.js with webpack, for example this one.