记录一下 本文使用 react-app-rewired+env-cmd+progress-bar-webpack-plugin实现 打包或运行时会显示进度条 无痛点 全在如下代码片段 注释比较清晰

源码 https://gitee.com/tothis/react-record/tree/master/base

yarn add react-app-rewired env-cmd progress-bar-webpack-plugin -D

使用env-cmd的 js方式配置环境变量 指定的js文件会在项目运行/打包前预先执行

实现步骤

1. 使用react-app-rewired重写配置 并添加progress-bar-webpack-plugin进度条插件

// 根路径config-overrides.js
const chalk = require('chalk')
    // progress 进度条插件
    , progressBarPlugin = require('progress-bar-webpack-plugin')({
        width: 60
        , format: `${chalk.green('build')} [ ${chalk.cyan(':bar')} ]`
        + ` ${chalk.cyan(':msg')} ${chalk.red('(:percent)')}`
        , clear: true
    })
module.exports = (config, env) => {
    // 添加插件
    config.plugins.push(progressBarPlugin)
    return config
}

1. 配置version.js

// 此处定义的环境变量会覆盖env文件定义的环境变量
module.exports = Promise.resolve({
    REACT_APP_VERSION: '1.0',
    REACT_APP_BUILD_TIME: new Date().getTime()
})

package.json

{
	"scripts": {
	    "start": "env-cmd -f version.js react-app-rewired start",
	    "build": "env-cmd -f version.js react-app-rewired build",
	    "test": "react-app-rewired test",
	    "eject": "react-scripts eject"
  }
}

1. 使用
   在执行yarn build或yarn start时会出现进度条
   项目版本号使用

import React, { Component } from 'react'

export default class extends Component {
    render() {
	    const a = 'font-weight:bold;color:#fff;background:#606060;padding:5px 0;border-radius:4px 0 0 4px;';
	        const b = 'font-weight:bold;color:#fff;background:#ff8585;padding:5px 0;border-radius:0 4px 4px 0;';
        return (
            <p>{console.log(`%c build-time %c ${process.env.REACT_APP_BUILD_TIME} `, a, b)}</p>
        )
    }
}