mk-mobile-command/scripts/build.js

mk移动端脚手架

'use strict';

process.env.BABEL_ENV = 'production';
process.env.NODE_ENV = 'production';

//promise未处理reject的异常
process.on('unhandledRejection', err => {
  throw err;
});

require('../config/env');

const chalk = require('chalk');
const fs = require('fs-extra');
const webpack = require('webpack');
const config = require('../config/webpack.config.prod');
const paths = require('../config/paths');
const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
const FileSizeReporter = require('react-dev-utils/FileSizeReporter');
const printBuildError = require('react-dev-utils/printBuildError');


// 检测必须的文件，不存在自动退出
if (!checkRequiredFiles([paths.appIndexJs])) {
  process.exit(1);
}

console.log(chalk.green(`开始编译生产环境输出资源...`));

emptyDir()
  .then(() => build())
  .then(({ warnings }) => {
    //存在警告
    if (warnings.length) {
      console.log(chalk.yellow('编译警告.\n'));
      console.log(warnings.join('\n\n'));
    } else {
      console.log(chalk.green(`编译成功.,输出目录:${paths.appProdBuild}`));
    }
  })
  .catch(err => {
    console.log(chalk.red('编译失败.\n'));
    //输出编译异常
    printBuildError(err);
    process.exit(1);
  })

function emptyDir() {
  console.log(`  ${chalk.bold('[1/2]')} 清空目录:${paths.appProdBuild}`)
  return new Promise((resolve, reject) => {
    //清空目录中文件
    fs.emptyDirSync(paths.appProdBuild);
    resolve()
  })
}


function build(previousFileSizes) {
  console.log(`  ${chalk.bold('[2/2]')} 编译app...`)

  let compiler = webpack(config);
  return new Promise((resolve, reject) => {
    compiler.run((err, stats) => {
      if (err) {
        return reject(err);
      }
      const messages = formatWebpackMessages(stats.toJson({}, true));

      //存在编译异常
      if (messages.errors.length) {
        if (messages.errors.length > 1) {
          messages.errors.length = 1;
        }
        return reject(new Error(messages.errors.join('\n\n')));
      }
      return resolve({
        stats,
        previousFileSizes,
        warnings: messages.warnings,
      });
    });
  });
}