@mpxjs/webpack-plugin/lib/index.js

'use strict'

const path = require('path')
const ConcatSource = require('webpack-sources').ConcatSource
const ResolveDependency = require('./dependency/ResolveDependency')
const InjectDependency = require('./dependency/InjectDependency')
const ReplaceDependency = require('./dependency/ReplaceDependency')
const NullFactory = require('webpack/lib/NullFactory')
const normalize = require('./utils/normalize')
const toPosix = require('./utils/to-posix')
const addQuery = require('./utils/add-query')
const DefinePlugin = require('webpack/lib/DefinePlugin')
const ExternalsPlugin = require('webpack/lib/ExternalsPlugin')
const AddModePlugin = require('./resolver/AddModePlugin')
const CommonJsRequireDependency = require('webpack/lib/dependencies/CommonJsRequireDependency')
const HarmonyImportSideEffectDependency = require('webpack/lib/dependencies/HarmonyImportSideEffectDependency')
const RequireHeaderDependency = require('webpack/lib/dependencies/RequireHeaderDependency')
const RemovedModuleDependency = require('./dependency/RemovedModuleDependency')
const SplitChunksPlugin = require('webpack/lib/optimize/SplitChunksPlugin')
const fixRelative = require('./utils/fix-relative')
const parseRequest = require('./utils/parse-request')
const matchCondition = require('./utils/match-condition')

const isProductionLikeMode = options => {
  return options.mode === 'production' || !options.mode
}

const outputFilename = '[name].js'
const publicPath = '/'

function isChunkInPackage (chunkName, packageName) {
  return (new RegExp(`^${packageName}\\/`)).test(chunkName)
}

function getPackageCacheGroup (packageName) {
  if (packageName === 'main') {
    return {
      name: 'bundle',
      minChunks: 2,
      chunks: 'all'
    }
  } else {
    return {
      test: (module, chunks) => {
        return chunks.every((chunk) => {
          return isChunkInPackage(chunk.name, packageName)
        })
      },
      name: `${packageName}/bundle`,
      minChunks: 2,
      minSize: 1000,
      priority: 100,
      chunks: 'all'
    }
  }
}

let loaderOptions

const externalsMap = {
  weui: /^weui-miniprogram/
}

class MpxWebpackPlugin {
  constructor (options = {}) {
    options.mode = options.mode || 'wx'

    options.srcMode = options.srcMode || options.mode
    if (options.mode !== options.srcMode && options.srcMode !== 'wx') {
      throw new Error('MpxWebpackPlugin supports srcMode to be "wx" only temporarily!')
    }
    if (options.mode === 'web' && options.srcMode !== 'wx') {
      throw new Error('MpxWebpackPlugin supports mode to be "web" only when srcMode is set to "wx"!')
    }
    if (!Array.isArray(options.externalClasses)) {
      options.externalClasses = ['custom-class', 'i-class']
    }

    options.externalClasses = options.externalClasses.map((className) => {
      return {
        className,
        replacement: className.replace(/-(.)/g, (matched, $1) => {
          return $1.toUpperCase()
        })
      }
    })
    options.resolveMode = options.resolveMode || 'webpack'
    options.writeMode = options.writeMode || 'changed'
    options.autoScopeRules = options.autoScopeRules || {}
    options.forceDisableInject = options.forceDisableInject || false
    options.forceDisableProxyCtor = options.forceDisableProxyCtor || false
    options.transMpxRules = options.transMpxRules || {
      include: () => true
    }
    if (options.autoSplit === undefined) {
      // web模式下默认不开启autoSplit
      options.autoSplit = options.mode !== 'web'
    }
    // 通过默认defs配置实现mode及srcMode的注入，简化内部处理逻辑
    options.defs = Object.assign({}, options.defs, {
      '__mpx_mode__': options.mode,
      '__mpx_src_mode__': options.srcMode
    })
    // 批量指定源码mode
    options.modeRules = options.modeRules || {}
    options.generateBuildMap = options.generateBuildMap || false
    options.attributes = options.attributes || []
    options.externals = (options.externals || []).map((external) => {
      return externalsMap[external] || external
    })
    options.forceUsePageCtor = options.forceUsePageCtor || false
    this.options = options
  }

  static loader (options) {
    loaderOptions = options
    return { loader: normalize.lib('loader'), options }
  }

  static pluginLoader (options) {
    return { loader: normalize.lib('plugin-loader'), options }
  }

  static wxsPreLoader (options) {
    return { loader: normalize.lib('wxs/wxs-pre-loader'), options }
  }

  static urlLoader (options) {
    return { loader: normalize.lib('url-loader'), options }
  }

  static fileLoader (options) {
    return { loader: normalize.lib('file-loader'), options }
  }

  runModeRules (request) {
    const { resourcePath, queryObj } = parseRequest(request)
    if (queryObj.mode) {
      return request
    }
    const mode = this.options.mode
    const modeRule = this.options.modeRules[mode]
    if (!modeRule) {
      return request
    }
    if (matchCondition(resourcePath, modeRule)) {
      return addQuery(request, { mode })
    }
    return request
  }

  apply (compiler) {
    if (!compiler.__mpx__) {
      compiler.__mpx__ = true
    } else {
      throw new Error('Multiple MpxWebpackPlugin instances exist in webpack compiler, please check webpack plugins config!')
    }
    const warnings = []
    const errors = []
    if (this.options.mode !== 'web') {
      // 强制设置publicPath为'/'
      if (compiler.options.output.publicPath && compiler.options.output.publicPath !== publicPath) {
        warnings.push(`webpack options: MpxWebpackPlugin accept options.output.publicPath to be ${publicPath} only, custom options.output.publicPath will be ignored!`)
      }
      compiler.options.output.publicPath = publicPath
      if (compiler.options.output.filename && compiler.options.output.filename !== outputFilename) {
        warnings.push(`webpack options: MpxWebpackPlugin accept options.output.filename to be ${outputFilename} only, custom options.output.filename will be ignored!`)
      }
      compiler.options.output.filename = compiler.options.output.chunkFilename = outputFilename
    }

    if (!compiler.options.node || !compiler.options.node.global) {
      compiler.options.node = compiler.options.node || {}
      compiler.options.node.global = true
      warnings.push(`webpack options: MpxWebpackPlugin strongly depends options.node.globel to be true, custom options.node will be ignored!`)
    }

    const resolvePlugin = new AddModePlugin('before-resolve', this.options.mode, 'resolve')

    if (Array.isArray(compiler.options.resolve.plugins)) {
      compiler.options.resolve.plugins.push(resolvePlugin)
    } else {
      compiler.options.resolve.plugins = [resolvePlugin]
    }

    let splitChunksPlugin
    let splitChunksOptions

    if (this.options.autoSplit) {
      compiler.options.optimization.runtimeChunk = {
        name: 'bundle'
      }
      splitChunksOptions = compiler.options.optimization.splitChunks
      delete compiler.options.optimization.splitChunks
      splitChunksPlugin = new SplitChunksPlugin(splitChunksOptions)
      splitChunksPlugin.apply(compiler)
    }

    // 代理writeFile
    if (this.options.writeMode === 'changed') {
      const writedFileContentMap = new Map()
      const originalWriteFile = compiler.outputFileSystem.writeFile
      compiler.outputFileSystem.writeFile = (filePath, content, callback) => {
        if (writedFileContentMap.has(filePath) && writedFileContentMap.get(filePath).equals(content)) {
          return callback()
        }
        writedFileContentMap.set(filePath, content)
        originalWriteFile(filePath, content, callback)
      }
    }
    const defs = this.options.defs

    const defsOpt = {
      '__mpx_wxs__': DefinePlugin.runtimeValue(({ module }) => {
        return JSON.stringify(!!module.wxs)
      })
    }

    Object.keys(defs).forEach((key) => {
      defsOpt[key] = JSON.stringify(defs[key])
    })

    // define mode & defs
    new DefinePlugin(defsOpt).apply(compiler)

    new ExternalsPlugin('commonjs2', this.options.externals).apply(compiler)

    compiler.hooks.compilation.tap('MpxWebpackPlugin ', (compilation) => {
      compilation.hooks.normalModuleLoader.tap('MpxWebpackPlugin', (loaderContext, module) => {
        // 设置loaderContext的minimize
        if (isProductionLikeMode(compiler.options)) {
          loaderContext.minimize = true
        }
      })
    })

    let mpx

    compiler.hooks.thisCompilation.tap('MpxWebpackPlugin', (compilation, { normalModuleFactory }) => {
      compilation.warnings = compilation.warnings.concat(warnings)
      compilation.errors = compilation.errors.concat(errors)
      // additionalAssets和mpx由于包含缓存机制，必须在每次compilation时重新初始化
      const additionalAssets = {}
      if (!compilation.__mpx__) {
        // init mpx
        mpx = compilation.__mpx__ = {
          // pages全局记录，无需区分主包分包
          pagesMap: {},
          // 记录pages对应的entry，处理多appEntry输出web多页项目时可能出现的pagePath冲突的问题，多appEntry输出目前仅web模式支持
          pagesEntryMap: {},
          // 组件资源记录，依照所属包进行记录，冗余存储，只要某个包有引用会添加对应记录，不管其会不会在当前包输出，这样设计主要是为了在resolve时能够以较低成本找到特定资源的输出路径
          componentsMap: {
            main: {}
          },
          // 静态资源(图片，字体，独立样式)等，依照所属包进行记录，冗余存储，同上
          staticResourceMap: {
            main: {}
          },
          hasApp: false,
          // 记录静态资源首次命中的分包，当有其他分包再次引用了同样的静态资源时，对其request添加packageName query以避免模块缓存导致loader不再执行
          staticResourceHit: {},
          loaderOptions,
          extractedMap: {},
          extractSeenFile: {},
          usingComponents: [],
          // todo es6 map读写性能高于object，之后会逐步替换
          vueContentCache: new Map(),
          currentPackageRoot: '',
          wxsMap: {},
          wxsConentMap: {},
          forceDisableInject: this.options.forceDisableInject,
          forceUsePageCtor: this.options.forceUsePageCtor,
          resolveMode: this.options.resolveMode,
          mode: this.options.mode,
          srcMode: this.options.srcMode,
          globalMpxAttrsFilter: this.options.globalMpxAttrsFilter,
          externalClasses: this.options.externalClasses,
          projectRoot: this.options.projectRoot,
          autoScopeRules: this.options.autoScopeRules,
          // native文件专用相关配置
          nativeOptions: Object.assign({
            cssLangs: ['css', 'less', 'stylus', 'scss', 'sass']
          }, this.options.nativeOptions),
          defs: this.options.defs,
          i18n: this.options.i18n,
          appTitle: 'Mpx homepage',
          attributes: this.options.attributes,
          externals: this.options.externals,
          extract: (content, file, index, sideEffects) => {
            additionalAssets[file] = additionalAssets[file] || []
            if (!additionalAssets[file][index]) {
              additionalAssets[file][index] = content
            }
            sideEffects && sideEffects(additionalAssets)
          },
          // 组件和静态资源的输出规则如下：
          // 1. 主包引用的资源输出至主包
          // 2. 分包引用且主包引用过的资源输出至主包，不在当前分包重复输出
          // 3. 分包引用且无其他包引用的资源输出至当前分包
          // 4. 分包引用且其他分包也引用过的资源，重复输出至当前分包
          // 5. 当用户通过packageName query显式指定了资源的所属包时，输出至指定的包
          getPackageInfo (resource, { outputPath, isStatic, error }) {
            let packageRoot = ''
            let packageName = 'main'
            const currentPackageRoot = mpx.currentPackageRoot
            const currentPackageName = currentPackageRoot || 'main'
            const { resourcePath, queryObj } = parseRequest(resource)
            const resourceMap = isStatic ? mpx.staticResourceMap : mpx.componentsMap
            // 主包中有引用一律使用主包中资源，不再额外输出
            if (!resourceMap.main[resourcePath]) {
              if (queryObj.packageName) {
                packageName = queryObj.packageName
                packageRoot = packageName === 'main' ? '' : packageName
                if (packageName !== currentPackageName && packageName !== 'main') {
                  error && error(new Error(`根据小程序分包资源引用规则，资源只支持声明为当前分包或者主包，否则可能会导致资源无法引用的问题，当前资源的当前分包为${currentPackageName}，资源查询字符串声明的分包为${packageName}，请检查！`))
                }
              } else if (currentPackageRoot) {
                packageName = packageRoot = currentPackageRoot
              }
            }

            outputPath = toPosix(path.join(packageRoot, outputPath))

            const currentResourceMap = resourceMap[currentPackageName]
            const actualResourceMap = resourceMap[packageName]

            let alreadyOutputed = false
            // 如果之前已经进行过输出，则不需要重复进行
            if (actualResourceMap[resourcePath]) {
              outputPath = actualResourceMap[resourcePath]
              alreadyOutputed = true
            }
            // 将当前的currentResourceMap和实际进行输出的actualResourceMap都填充上，便于resolve时使用
            currentResourceMap[resourcePath] = actualResourceMap[resourcePath] = outputPath

            if (isStatic && packageName !== 'main' && !mpx.staticResourceHit[resourcePath]) {
              mpx.staticResourceHit[resourcePath] = packageName
            }

            return {
              packageName,
              packageRoot,
              resourcePath,
              queryObj,
              outputPath,
              alreadyOutputed
            }
          }
        }
      }

      if (splitChunksPlugin) {
        // 自动跟进分包配置修改splitChunksPlugin配置
        compilation.hooks.finishModules.tap('MpxWebpackPlugin', (modules) => {
          let needInit = false
          Object.keys(mpx.componentsMap).forEach((packageName) => {
            if (!splitChunksOptions.cacheGroups.hasOwnProperty(packageName)) {
              needInit = true
              splitChunksOptions.cacheGroups[packageName] = getPackageCacheGroup(packageName)
            }
          })
          if (needInit) {
            splitChunksPlugin.options = SplitChunksPlugin.normalizeOptions(splitChunksOptions)
          }
        })
      }

      compilation.hooks.optimizeModules.tap('MpxWebpackPlugin', (modules) => {
        modules.forEach((module) => {
          if (module.needRemove) {
            let removed = false
            module.reasons.forEach((reason) => {
              if (reason.module) {
                if (reason.dependency instanceof HarmonyImportSideEffectDependency) {
                  reason.module.removeDependency(reason.dependency)
                  reason.module.addDependency(new RemovedModuleDependency(reason.dependency.request))
                  removed = true
                } else if (reason.dependency instanceof CommonJsRequireDependency && reason.dependency.loc.range) {
                  let index = reason.module.dependencies.indexOf(reason.dependency)
                  if (index > -1 && reason.module.dependencies[index + 1] instanceof RequireHeaderDependency) {
                    reason.module.dependencies.splice(index, 2)
                    reason.module.addDependency(new RemovedModuleDependency(reason.dependency.request, reason.dependency.loc.range))
                    removed = true
                  }
                }
              }
            })
            if (removed) {
              module.chunksIterable.forEach((chunk) => {
                module.removeChunk(chunk)
              })
              module.disconnect()
            }
          }
        })
      })

      compilation.hooks.additionalAssets.tapAsync('MpxWebpackPlugin', (callback) => {
        for (let file in additionalAssets) {
          let content = new ConcatSource()
          if (additionalAssets[file].prefix) {
            additionalAssets[file].prefix.forEach((item) => {
              content.add(item)
            })
          }
          additionalAssets[file].forEach((item) => {
            content.add(item)
          })
          compilation.assets[file] = content
        }
        callback()
      })

      compilation.dependencyFactories.set(ResolveDependency, new NullFactory())
      compilation.dependencyTemplates.set(ResolveDependency, new ResolveDependency.Template())

      compilation.dependencyFactories.set(InjectDependency, new NullFactory())
      compilation.dependencyTemplates.set(InjectDependency, new InjectDependency.Template())

      compilation.dependencyFactories.set(ReplaceDependency, new NullFactory())
      compilation.dependencyTemplates.set(ReplaceDependency, new ReplaceDependency.Template())

      compilation.dependencyFactories.set(RemovedModuleDependency, normalModuleFactory)
      compilation.dependencyTemplates.set(RemovedModuleDependency, new RemovedModuleDependency.Template())

      normalModuleFactory.hooks.parser.for('javascript/auto').tap('MpxWebpackPlugin', (parser) => {
        // hack预处理，将expr.range写入loc中便于在CommonJsRequireDependency中获取，移除无效require
        parser.hooks.call.for('require').tap({ name: 'MpxWebpackPlugin', stage: -100 }, (expr) => {
          expr.loc.range = expr.range
        })

        parser.hooks.call.for('__mpx_resolve_path__').tap('MpxWebpackPlugin', (expr) => {
          if (expr.arguments[0]) {
            const resource = expr.arguments[0].value
            const { queryObj } = parseRequest(resource)
            const packageName = queryObj.packageName
            const pagesMap = mpx.pagesMap
            const componentsMap = mpx.componentsMap
            const staticResourceMap = mpx.staticResourceMap
            const publicPath = mpx.mode === 'web' ? '' : compilation.outputOptions.publicPath
            const range = expr.range
            const issuerResource = parser.state.module.issuer.resource
            const dep = new ResolveDependency(resource, packageName, pagesMap, componentsMap, staticResourceMap, publicPath, range, issuerResource)
            parser.state.current.addDependency(dep)
            return true
          }
        })

        const transHandler = (expr) => {
          const module = parser.state.module
          const current = parser.state.current
          const { queryObj, resourcePath } = parseRequest(module.resource)
          const localSrcMode = queryObj.mode
          const globalSrcMode = this.options.srcMode
          const srcMode = localSrcMode || globalSrcMode
          const mode = this.options.mode

          let target

          if (expr.type === 'Identifier') {
            target = expr
          } else if (expr.type === 'MemberExpression') {
            target = expr.object
          }
          if (!matchCondition(resourcePath, this.options.transMpxRules) || resourcePath.indexOf('@mpxjs') !== -1 || !target || mode === srcMode) {
            return
          }

          const type = target.name

          const name = type === 'wx' ? 'mpx' : 'createFactory'
          const replaceContent = type === 'wx' ? 'mpx' : `${name}(${JSON.stringify(type)})`

          const dep = new ReplaceDependency(replaceContent, target.range)
          current.addDependency(dep)

          let needInject = true
          for (let v of module.variables) {
            if (v.name === name) {
              needInject = false
              break
            }
          }
          if (needInject) {
            const expression = `require(${JSON.stringify(`@mpxjs/core/src/runtime/${name}`)})`
            const deps = []
            parser.parse(expression, {
              current: {
                addDependency: dep => {
                  dep.userRequest = name
                  deps.push(dep)
                }
              },
              module
            })
            module.addVariable(name, expression, deps)
          }
        }

        // hack babel polyfill global
        parser.hooks.evaluate.for('CallExpression').tap('MpxWebpackPlugin', (expr) => {
          if (/core-js/.test(parser.state.module.resource)) {
            const current = parser.state.current
            const arg0 = expr.arguments[0]
            const callee = expr.callee
            if (arg0 && arg0.value === 'return this' && callee.name === 'Function') {
              current.addDependency(new InjectDependency({
                content: '(function() { return this })() || ',
                index: expr.range[0]
              }))
            }
          }
        })

        if (this.options.srcMode !== this.options.mode) {
          // 全量替换未声明的wx identifier
          parser.hooks.expression.for('wx').tap('MpxWebpackPlugin', transHandler)

          // parser.hooks.evaluate.for('MemberExpression').tap('MpxWebpackPlugin', (expr) => {
          //   // Undeclared varible for wx[identifier]()
          //   // TODO Unable to handle wx[identifier]
          //   if (expr.object.name === 'wx' && !parser.scope.definitions.has('wx')) {
          //     transHandler(expr)
          //   }
          // })
          // // Trans for wx.xx, wx['xx'], wx.xx(), wx['xx']()
          // parser.hooks.expressionAnyMember.for('wx').tap('MpxWebpackPlugin', transHandler)
          // Proxy ctor for transMode
          if (!this.options.forceDisableProxyCtor) {
            parser.hooks.call.for('Page').tap('MpxWebpackPlugin', (expr) => {
              transHandler(expr.callee)
            })
            parser.hooks.call.for('Component').tap('MpxWebpackPlugin', (expr) => {
              transHandler(expr.callee)
            })
            parser.hooks.call.for('App').tap('MpxWebpackPlugin', (expr) => {
              transHandler(expr.callee)
            })
            if (this.options.mode === 'ali') {
              // 支付宝不支持Behaviors
              parser.hooks.call.for('Behavior').tap('MpxWebpackPlugin', (expr) => {
                transHandler(expr.callee)
              })
            }
          }
        }

        const apiBlackListMap = [
          'createApp',
          'createPage',
          'createComponent',
          'createStore',
          'toPureObject',
          'mixin: injectMixins',
          'injectMixins',
          'observable',
          'extendObservable',
          'watch',
          'use',
          'set',
          'get',
          'remove',
          'setConvertRule',
          'createAction'
        ].reduce((map, api) => {
          map[api] = true
          return map
        }, {})

        const handler = (expr) => {
          const callee = expr.callee
          const args = expr.arguments
          const name = callee.object.name
          const { queryObj, resourcePath } = parseRequest(parser.state.module.resource)

          if (apiBlackListMap[callee.property.name || callee.property.value] || (name !== 'mpx' && name !== 'wx') || (name === 'wx' && !matchCondition(resourcePath, this.options.transMpxRules))) {
            return
          }

          const localSrcMode = queryObj.mode
          const globalSrcMode = this.options.srcMode
          const srcMode = localSrcMode || globalSrcMode
          const srcModeString = `__mpx_src_mode_${srcMode}__`
          const dep = new InjectDependency({
            content: args.length
              ? `, ${JSON.stringify(srcModeString)}`
              : JSON.stringify(srcModeString),
            index: expr.end - 1
          })
          parser.state.current.addDependency(dep)
        }

        if (this.options.srcMode !== this.options.mode) {
          parser.hooks.callAnyMember.for('imported var').tap('MpxWebpackPlugin', handler)
          parser.hooks.callAnyMember.for('mpx').tap('MpxWebpackPlugin', handler)
          parser.hooks.callAnyMember.for('wx').tap('MpxWebpackPlugin', handler)
        }
      })
    })

    compiler.hooks.normalModuleFactory.tap('MpxWebpackPlugin', (normalModuleFactory) => {
      // resolve前修改原始request
      normalModuleFactory.hooks.beforeResolve.tapAsync('MpxWebpackPlugin', (data, callback) => {
        let request = data.request
        let { queryObj, resource } = parseRequest(request)
        if (queryObj.resolve) {
          // 此处的query用于将资源引用的当前包信息传递给resolveDependency
          const pathLoader = normalize.lib('path-loader')
          const packageName = mpx.currentPackageRoot || 'main'
          resource = addQuery(resource, {
            packageName
          })
          data.request = `!!${pathLoader}!${resource}`
        } else if (queryObj.wxsModule) {
          const wxsPreLoader = normalize.lib('wxs/wxs-pre-loader')
          if (!/wxs-loader/.test(request)) {
            data.request = `!!${wxsPreLoader}!${resource}`
          }
        }
        callback(null, data)
      })

      // resolve完成后修改loaders或者resource/request
      normalModuleFactory.hooks.afterResolve.tapAsync('MpxWebpackPlugin', (data, callback) => {
        const isFromMpx = /\.(mpx|vue)/.test(data.resource)
        if (data.loaders && isFromMpx) {
          data.loaders.forEach((loader) => {
            if (/ts-loader/.test(loader.loader)) {
              loader.options = Object.assign({}, { appendTsSuffixTo: [/\.(mpx|vue)$/] })
            }
          })
        }
        // 根据用户传入的modeRules对特定资源添加mode query
        data.resource = this.runModeRules(data.resource)

        if (mpx.currentPackageRoot) {
          const resourcePath = parseRequest(data.resource).resourcePath

          const staticResourceHit = mpx.staticResourceHit
          const packageName = mpx.currentPackageRoot || 'main'

          let needAddQuery = false

          if (staticResourceHit[resourcePath] && staticResourceHit[resourcePath] !== packageName) {
            needAddQuery = true
          }

          if (needAddQuery) {
            // 此处的query用于避免静态资源模块缓存，确保不同分包中引用的静态资源为不同模块
            data.request = addQuery(data.request, {
              packageName
            })
          }
        }
        callback(null, data)
      })
    })

    compiler.hooks.emit.tapAsync('MpxWebpackPlugin', (compilation, callback) => {
      if (this.options.mode === 'web') return callback()
      const jsonpFunction = compilation.outputOptions.jsonpFunction

      function getTargetFile (file) {
        let targetFile = file
        const queryStringIdx = targetFile.indexOf('?')
        if (queryStringIdx >= 0) {
          targetFile = targetFile.substr(0, queryStringIdx)
        }
        return targetFile
      }

      const processedChunk = new Set()
      const rootName = compilation._preparedEntrypoints[0].name

      function processChunk (chunk, isRuntime, relativeChunks) {
        if (!chunk.files[0] || processedChunk.has(chunk)) {
          return
        }

        let originalSource = compilation.assets[chunk.files[0]]
        const source = new ConcatSource()
        source.add('\nvar window = window || {};\n\n')

        relativeChunks.forEach((relativeChunk, index) => {
          if (!relativeChunk.files[0]) return
          let chunkPath = getTargetFile(chunk.files[0])
          let relativePath = getTargetFile(relativeChunk.files[0])
          relativePath = path.relative(path.dirname(chunkPath), relativePath)
          relativePath = fixRelative(relativePath, mpx.mode)
          relativePath = toPosix(relativePath)
          if (index === 0) {
            // 引用runtime
            // 支付宝分包独立打包，通过全局context获取webpackJSONP
            if (mpx.mode === 'ali') {
              if (chunk.name === rootName) {
                // 在rootChunk中挂载jsonpFunction
                source.add('// process ali subpackages runtime in root chunk\n' +
                  'var context = (function() { return this })() || Function("return this")();\n\n')
                source.add(`context[${JSON.stringify(jsonpFunction)}] = window[${JSON.stringify(jsonpFunction)}] = require("${relativePath}");\n`)
              } else {
                // 其余chunk中通过context全局传递runtime
                source.add('// process ali subpackages runtime in other chunk\n' +
                  'var context = (function() { return this })() || Function("return this")();\n\n')
                source.add(`window[${JSON.stringify(jsonpFunction)}] = context[${JSON.stringify(jsonpFunction)}];\n`)
              }
            } else {
              source.add(`window[${JSON.stringify(jsonpFunction)}] = require("${relativePath}");\n`)
            }
          } else {
            source.add(`require("${relativePath}");\n`)
          }
        })

        if (isRuntime) {
          source.add('var context = (function() { return this })() || Function("return this")();\n')
          source.add(`
// Fix babel runtime in some quirky environment like ali & qq dev.
if(!context.console) {
  try {
    context.console = console;
    context.setInterval = setInterval;
    context.setTimeout = setTimeout;
    context.JSON = JSON;
    context.Math = Math;
    context.RegExp = RegExp;
    context.Infinity = Infinity;
    context.isFinite = isFinite;
    context.parseFloat = parseFloat;
    context.parseInt = parseInt;
    context.Promise = Promise;
    context.WeakMap = WeakMap;
    context.Reflect = Reflect;
    context.RangeError = RangeError;
    context.TypeError = TypeError;
    context.Uint8Array = Uint8Array;
    context.DataView = DataView;
    context.ArrayBuffer = ArrayBuffer;
    context.Symbol = Symbol;
  } catch(e){
  }
}
\n`)
          if (mpx.mode === 'swan') {
            source.add('// swan runtime fix\n' +
              'if (!context.navigator) {\n' +
              '  context.navigator = {};\n' +
              '}\n' +
              'Object.defineProperty(context.navigator, "standalone",{\n' +
              '  configurable: true,' +
              '  enumerable: true,' +
              '  get () {\n' +
              '    return true;\n' +
              '  }\n' +
              '});\n\n')
          }
          source.add(originalSource)
          source.add(`\nmodule.exports = window[${JSON.stringify(jsonpFunction)}];\n`)
        } else {
          if (mpx.pluginMain === chunk.name) {
            source.add('module.exports =\n')
          }
          source.add(originalSource)
        }

        compilation.assets[chunk.files[0]] = source
        processedChunk.add(chunk)
      }

      compilation.chunkGroups.forEach((chunkGroup) => {
        if (!chunkGroup.isInitial()) {
          return
        }

        let runtimeChunk, entryChunk
        let middleChunks = []

        let chunksLength = chunkGroup.chunks.length

        chunkGroup.chunks.forEach((chunk, index) => {
          if (index === 0) {
            runtimeChunk = chunk
          } else if (index === chunksLength - 1) {
            entryChunk = chunk
          } else {
            middleChunks.push(chunk)
          }
        })

        if (runtimeChunk) {
          processChunk(runtimeChunk, true, [])
          if (middleChunks.length) {
            middleChunks.forEach((middleChunk) => {
              processChunk(middleChunk, false, [runtimeChunk])
            })
          }
          if (entryChunk) {
            middleChunks.unshift(runtimeChunk)
            processChunk(entryChunk, false, middleChunks)
          }
        }
      })

      if (this.options.generateBuildMap) {
        const pagesMap = compilation.__mpx__.pagesMap
        const componentsPackageMap = compilation.__mpx__.componentsMap
        const componentsMap = Object.keys(componentsPackageMap).map(item => componentsPackageMap[item]).reduce((pre, cur) => { return { ...pre, ...cur } }, {})
        const outputMap = JSON.stringify({ ...pagesMap, ...componentsMap })
        compilation.assets['../outputMap.json'] = {
          source: () => {
            return outputMap
          },
          size: () => {
            return Buffer.byteLength(outputMap, 'utf8')
          }
        }
      }

      callback()
    })
  }
}

module.exports = MpxWebpackPlugin