优化：忽略依赖中不必要的语言包

yarn add moment webpack-dev-server -D

忽略掉moment的其他语言包

let webpack = require('webpack')

plugins: [
    new webpack.IgnorePlugin(/\.\/locale/, /moment/)
]

index.js

import moment from 'moment'

let r = moment().endOf('day').fromNow()  // 距离现在多少天
console.log(r);

从 1.2MB 到 800kb