Resolve the 01-Vue source build process scripts / config.js

I had wanted to build it in an article in the process clear it, who knows a dynasty scripts / config.js it so long. Or a single pull out and see! !

Time to paste the code :)
please see the comments
summarized here a list of plug-ins used in a script, then slowly understand

• rollup-plugin-buble
• rollup-plugin-alias
• rollup-plugin-commonjs
• rollup-plugin-replace
• rollup-plugin-node-resolve
• rollup-plugin-flow-no- whitespace
  so long a list, which is the reason people do not want to read the source code, and the devil knows what they used plugins. Conversely want to see other people source code, you can learn a lot they do not know the package also excellent :)

What is not said, markdown editor csdn point of view the code is so hard, I still go vsc inside it.

After reading in general, in addition to the relatively large builds the object, this is the various target specific high building configuration, are repetitive stuff, no need to one-time reading.

This file is used to rollup is rollup configuration file. TARGET command line parameters can be passed to specify compile target, if you do not specify that all building.

const path = require('path') // node内建的操作文件系统路径的库
const buble = require('rollup-plugin-buble') // buble是一个ES2015的转码器，跟babel是一个级别上的，估计没有babel应用广泛
const alias = require('rollup-plugin-alias') // 别名插件，用来替换import中的别名
const cjs = require('rollup-plugin-commonjs')
const replace = require('rollup-plugin-replace') // 字符串替换
const node = require('rollup-plugin-node-resolve')
const flow = require('rollup-plugin-flow-no-whitespace')
const version = process.env.VERSION || require('../package.json').version // 当前构建的版本，以命令行传参优先级高
const weexVersion = process.env.WEEX_VERSION || require('../packages/weex-vue-framework/package.json').version

// 没啥好说的这是Vue文件中头部的版本和版权字符串
const banner =
  '/*!\n' +
  ` * Vue.js v${version}\n` +
  ` * (c) 2014-${new Date().getFullYear()} Evan You\n` +
  ' * Released under the MIT License.\n' +
  ' */'

const weexFactoryPlugin = {
  intro () {
    return 'module.exports = function weexFactory (exports, document) {'
  },
  outro () {
    return '}'
  }
}

const aliases = require('./alias')
const resolve = p => {
  const base = p.split('/')[0]
  if (aliases[base]) {
    return path.resolve(aliases[base], p.slice(base.length + 1))
  } else {
    return path.resolve(__dirname, '../', p)
  }
}

// 各种target的配置
const builds = {
  // Runtime only (CommonJS). Used by bundlers e.g. Webpack & Browserify
  'web-runtime-cjs-dev': {
    entry: resolve('web/entry-runtime.js'),
    dest: resolve('dist/vue.runtime.common.dev.js'),
    format: 'cjs',
    env: 'development',
    banner
  },
  'web-runtime-cjs-prod': {
    entry: resolve('web/entry-runtime.js'),
    dest: resolve('dist/vue.runtime.common.prod.js'),
    format: 'cjs',
    env: 'production',
    banner
  },
  // Runtime+compiler CommonJS build (CommonJS)
  'web-full-cjs-dev': {
    entry: resolve('web/entry-runtime-with-compiler.js'),
    dest: resolve('dist/vue.common.dev.js'),
    format: 'cjs',
    env: 'development',
    alias: { he: './entity-decoder' },
    banner
  },
  'web-full-cjs-prod': {
    entry: resolve('web/entry-runtime-with-compiler.js'),
    dest: resolve('dist/vue.common.prod.js'),
    format: 'cjs',
    env: 'production',
    alias: { he: './entity-decoder' },
    banner
  },
  // Runtime only (ES Modules). Used by bundlers that support ES Modules,
  // e.g. Rollup & Webpack 2
  'web-runtime-esm': {
    entry: resolve('web/entry-runtime.js'),
    dest: resolve('dist/vue.runtime.esm.js'),
    format: 'es',
    banner
  },
  // Runtime+compiler ES modules build (for bundlers)
  'web-full-esm': {
    entry: resolve('web/entry-runtime-with-compiler.js'),
    dest: resolve('dist/vue.esm.js'),
    format: 'es',
    alias: { he: './entity-decoder' },
    banner
  },
  // Runtime+compiler ES modules build (for direct import in browser)
  'web-full-esm-browser-dev': {
    entry: resolve('web/entry-runtime-with-compiler.js'),
    dest: resolve('dist/vue.esm.browser.js'),
    format: 'es',
    transpile: false,
    env: 'development',
    alias: { he: './entity-decoder' },
    banner
  },
  // Runtime+compiler ES modules build (for direct import in browser)
  'web-full-esm-browser-prod': {
    entry: resolve('web/entry-runtime-with-compiler.js'),
    dest: resolve('dist/vue.esm.browser.min.js'),
    format: 'es',
    transpile: false,
    env: 'production',
    alias: { he: './entity-decoder' },
    banner
  },
  // runtime-only build (Browser)
  'web-runtime-dev': {
    entry: resolve('web/entry-runtime.js'),
    dest: resolve('dist/vue.runtime.js'),
    format: 'umd',
    env: 'development',
    banner
  },
  // runtime-only production build (Browser)
  'web-runtime-prod': {
    entry: resolve('web/entry-runtime.js'),
    dest: resolve('dist/vue.runtime.min.js'),
    format: 'umd',
    env: 'production',
    banner
  },
  // Runtime+compiler development build (Browser)
  'web-full-dev': {
    entry: resolve('web/entry-runtime-with-compiler.js'),
    dest: resolve('dist/vue.js'),
    format: 'umd',
    env: 'development',
    alias: { he: './entity-decoder' },
    banner
  },
  // Runtime+compiler production build  (Browser)
  'web-full-prod': {
    entry: resolve('web/entry-runtime-with-compiler.js'),
    dest: resolve('dist/vue.min.js'),
    format: 'umd',
    env: 'production',
    alias: { he: './entity-decoder' },
    banner
  },
  // Web compiler (CommonJS).
  'web-compiler': {
    entry: resolve('web/entry-compiler.js'),
    dest: resolve('packages/vue-template-compiler/build.js'),
    format: 'cjs',
    external: Object.keys(require('../packages/vue-template-compiler/package.json').dependencies)
  },
  // Web compiler (UMD for in-browser use).
  'web-compiler-browser': {
    entry: resolve('web/entry-compiler.js'),
    dest: resolve('packages/vue-template-compiler/browser.js'),
    format: 'umd',
    env: 'development',
    moduleName: 'VueTemplateCompiler',
    plugins: [node(), cjs()]
  },
  // Web server renderer (CommonJS).
  'web-server-renderer-dev': {
    entry: resolve('web/entry-server-renderer.js'),
    dest: resolve('packages/vue-server-renderer/build.dev.js'),
    format: 'cjs',
    env: 'development',
    external: Object.keys(require('../packages/vue-server-renderer/package.json').dependencies)
  },
  'web-server-renderer-prod': {
    entry: resolve('web/entry-server-renderer.js'),
    dest: resolve('packages/vue-server-renderer/build.prod.js'),
    format: 'cjs',
    env: 'production',
    external: Object.keys(require('../packages/vue-server-renderer/package.json').dependencies)
  },
  'web-server-renderer-basic': {
    entry: resolve('web/entry-server-basic-renderer.js'),
    dest: resolve('packages/vue-server-renderer/basic.js'),
    format: 'umd',
    env: 'development',
    moduleName: 'renderVueComponentToString',
    plugins: [node(), cjs()]
  },
  'web-server-renderer-webpack-server-plugin': {
    entry: resolve('server/webpack-plugin/server.js'),
    dest: resolve('packages/vue-server-renderer/server-plugin.js'),
    format: 'cjs',
    external: Object.keys(require('../packages/vue-server-renderer/package.json').dependencies)
  },
  'web-server-renderer-webpack-client-plugin': {
    entry: resolve('server/webpack-plugin/client.js'),
    dest: resolve('packages/vue-server-renderer/client-plugin.js'),
    format: 'cjs',
    external: Object.keys(require('../packages/vue-server-renderer/package.json').dependencies)
  },
  // Weex runtime factory
  'weex-factory': {
    weex: true,
    entry: resolve('weex/entry-runtime-factory.js'),
    dest: resolve('packages/weex-vue-framework/factory.js'),
    format: 'cjs',
    plugins: [weexFactoryPlugin]
  },
  // Weex runtime framework (CommonJS).
  'weex-framework': {
    weex: true,
    entry: resolve('weex/entry-framework.js'),
    dest: resolve('packages/weex-vue-framework/index.js'),
    format: 'cjs'
  },
  // Weex compiler (CommonJS). Used by Weex's Webpack loader.
  'weex-compiler': {
    weex: true,
    entry: resolve('weex/entry-compiler.js'),
    dest: resolve('packages/weex-template-compiler/build.js'),
    format: 'cjs',
    external: Object.keys(require('../packages/weex-template-compiler/package.json').dependencies)
  }
}

/***
 * 使用name获取指定的配置，从上面builds中
 */
function genConfig (name) {
  const opts = builds[name]
  // 这个是符合rollup的配置文件，看一遍rollup文档就知道啥意思了
  const config = {
    input: opts.entry, // 入口文件
    external: opts.external,
    plugins: [ // 需要的插件
      // 字符串替换插件
      replace({
        __WEEX__: !!opts.weex,
        __WEEX_VERSION__: weexVersion,
        __VERSION__: version
      }),
      flow(),
      alias(Object.assign({}, aliases, opts.alias))
    ].concat(opts.plugins || []),
    output: {
      file: opts.dest,
      format: opts.format,
      banner: opts.banner,
      name: opts.moduleName || 'Vue'
    },
    onwarn: (msg, warn) => {
      if (!/Circular/.test(msg)) {
        warn(msg)
      }
    }
  }

  // 环境变量注入
  if (opts.env) {
    // 直接使用replace插件替换文件中的process.env.NODE_ENV，这是用的字符串替换，注意
    // 这里用了stringify，不用会有问题的，可以自己思考一下哦
    config.plugins.push(replace({
      'process.env.NODE_ENV': JSON.stringify(opts.env)
    }))
  }

  // 如果没有明确配置了不需要转码，就用把buble放到插件列表中
  if (opts.transpile !== false) {
    config.plugins.push(buble())
  }

  Object.defineProperty(config, '_name', {
    enumerable: false,
    value: name
  })

  return config
}

// 获取命令行的环境变量参数，拿其中的TARGET，这是目标，就是告诉我们要编译针对哪个环境的
if (process.env.TARGET) {
  module.exports = genConfig(process.env.TARGET)
} else {
  // 没有指定TARGET的话就会编译全部的
  exports.getBuild = genConfig
  exports.getAllBuilds = () => Object.keys(builds).map(genConfig)
}