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Viewing file:     index.js (17.14 KB)      -rwxr-xr-x

'use strict'

/* global __coverage__ */

const cachingTransform = require('caching-transform')
const cpFile = require('cp-file')
const findCacheDir = require('find-cache-dir')
const fs = require('fs')
const glob = require('glob')
const Hash = require('./lib/hash')
const libCoverage = require('istanbul-lib-coverage')
const libHook = require('istanbul-lib-hook')
const libReport = require('istanbul-lib-report')
const mkdirp = require('make-dir')
const Module = require('module')
const onExit = require('signal-exit')
const path = require('path')
const reports = require('istanbul-reports')
const resolveFrom = require('resolve-from')
const rimraf = require('rimraf')
const SourceMaps = require('./lib/source-maps')
const testExclude = require('test-exclude')
const util = require('util')
const uuid = require('uuid/v4')

const debugLog = util.debuglog('nyc')

const ProcessInfo = require('./lib/process.js')

/* istanbul ignore next */
if (/self-coverage/.test(__dirname)) {
  require('../self-coverage-helper')
}

function coverageFinder () {
  var coverage = global.__coverage__
  if (typeof __coverage__ === 'object') coverage = __coverage__
  if (!coverage) coverage = global['__coverage__'] = {}
  return coverage
}

class NYC {
  constructor (config) {
    config = config || {}
    this.config = config

    this.subprocessBin = config.subprocessBin || path.resolve(__dirname, './bin/nyc.js')
    this._tempDirectory = config.tempDirectory || config.tempDir || './.nyc_output'
    this._instrumenterLib = require(config.instrumenter || './lib/instrumenters/istanbul')
    this._reportDir = config.reportDir || 'coverage'
    this._sourceMap = typeof config.sourceMap === 'boolean' ? config.sourceMap : true
    this._showProcessTree = config.showProcessTree || false
    this._eagerInstantiation = config.eager || false
    this.cwd = config.cwd || process.cwd()
    this.reporter = [].concat(config.reporter || 'text')

    this.cacheDirectory = (config.cacheDir && path.resolve(config.cacheDir)) || findCacheDir({ name: 'nyc', cwd: this.cwd })
    this.cache = Boolean(this.cacheDirectory && config.cache)

    this.extensions = [].concat(config.extension || [])
      .concat('.js')
      .map(ext => ext.toLowerCase())
      .filter((item, pos, arr) => arr.indexOf(item) === pos)

    this.exclude = testExclude({
      cwd: this.cwd,
      include: config.include,
      exclude: config.exclude,
      excludeNodeModules: config.excludeNodeModules !== false,
      extension: this.extensions
    })

    this.sourceMaps = new SourceMaps({
      cache: this.cache,
      cacheDirectory: this.cacheDirectory
    })

    // require extensions can be provided as config in package.json.
    this.require = [].concat(config.require || [])

    this.transforms = this.extensions.reduce((transforms, ext) => {
      transforms[ext] = this._createTransform(ext)
      return transforms
    }, {})

    this.hookRequire = config.hookRequire
    this.hookRunInContext = config.hookRunInContext
    this.hookRunInThisContext = config.hookRunInThisContext
    this.fakeRequire = null

    this.processInfo = new ProcessInfo(config && config._processInfo)
    this.rootId = this.processInfo.root || uuid()

    this.hashCache = {}
  }

  _createTransform (ext) {
    var opts = {
      salt: Hash.salt(this.config),
      hashData: (input, metadata) => [metadata.filename],
      onHash: (input, metadata, hash) => {
        this.hashCache[metadata.filename] = hash
      },
      cacheDir: this.cacheDirectory,
      // when running --all we should not load source-file from
      // cache, we want to instead return the fake source.
      disableCache: this._disableCachingTransform(),
      ext: ext
    }
    if (this._eagerInstantiation) {
      opts.transform = this._transformFactory(this.cacheDirectory)
    } else {
      opts.factory = this._transformFactory.bind(this)
    }
    return cachingTransform(opts)
  }

  _disableCachingTransform () {
    return !(this.cache && this.config.isChildProcess)
  }

  _loadAdditionalModules () {
    this.require.forEach(requireModule => {
      // Attempt to require the module relative to the directory being instrumented.
      // Then try other locations, e.g. the nyc node_modules folder.
      require(resolveFrom.silent(this.cwd, requireModule) || requireModule)
    })
  }

  instrumenter () {
    return this._instrumenter || (this._instrumenter = this._createInstrumenter())
  }

  _createInstrumenter () {
    return this._instrumenterLib({
      ignoreClassMethods: [].concat(this.config.ignoreClassMethod).filter(a => a),
      produceSourceMap: this.config.produceSourceMap,
      compact: this.config.compact,
      preserveComments: this.config.preserveComments,
      esModules: this.config.esModules,
      plugins: this.config.parserPlugins
    })
  }

  addFile (filename) {
    const source = this._readTranspiledSource(filename)
    this._maybeInstrumentSource(source, filename)
  }

  _readTranspiledSource (filePath) {
    var source = null
    var ext = path.extname(filePath)
    if (typeof Module._extensions[ext] === 'undefined') {
      ext = '.js'
    }
    Module._extensions[ext]({
      _compile: function (content, filename) {
        source = content
      }
    }, filePath)
    return source
  }

  addAllFiles () {
    this._loadAdditionalModules()

    this.fakeRequire = true
    this.exclude.globSync(this.cwd).forEach(relFile => {
      const filename = path.resolve(this.cwd, relFile)
      this.addFile(filename)
      const coverage = coverageFinder()
      const lastCoverage = this.instrumenter().lastFileCoverage()
      if (lastCoverage) {
        coverage[lastCoverage.path] = lastCoverage
      }
    })
    this.fakeRequire = false

    this.writeCoverageFile()
  }

  instrumentAllFiles (input, output, cb) {
    let inputDir = '.' + path.sep
    const visitor = relFile => {
      const inFile = path.resolve(inputDir, relFile)
      const inCode = fs.readFileSync(inFile, 'utf-8')
      const outCode = this._transform(inCode, inFile) || inCode

      if (output) {
        const mode = fs.statSync(inFile).mode
        const outFile = path.resolve(output, relFile)
        mkdirp.sync(path.dirname(outFile))
        fs.writeFileSync(outFile, outCode)
        fs.chmodSync(outFile, mode)
      } else {
        console.log(outCode)
      }
    }

    this._loadAdditionalModules()

    try {
      const stats = fs.lstatSync(input)
      if (stats.isDirectory()) {
        inputDir = input

        const filesToInstrument = this.exclude.globSync(input)

        if (this.config.completeCopy && output) {
          const globOptions = { dot: true, nodir: true, ignore: ['**/.git', '**/.git/**', path.join(output, '**')] }
          glob.sync(path.resolve(input, '**'), globOptions)
            .forEach(src => cpFile.sync(src, path.join(output, path.relative(input, src))))
        }
        filesToInstrument.forEach(visitor)
      } else {
        visitor(input)
      }
    } catch (err) {
      return cb(err)
    }
    cb()
  }

  _transform (code, filename) {
    const extname = path.extname(filename).toLowerCase()
    const transform = this.transforms[extname] || (() => null)

    return transform(code, { filename })
  }

  _maybeInstrumentSource (code, filename) {
    if (!this.exclude.shouldInstrument(filename)) {
      return null
    }

    return this._transform(code, filename)
  }

  maybePurgeSourceMapCache () {
    if (!this.cache) {
      this.sourceMaps.purgeCache()
    }
  }

  _transformFactory (cacheDir) {
    const instrumenter = this.instrumenter()
    let instrumented

    return (code, metadata, hash) => {
      const filename = metadata.filename
      let sourceMap = null

      if (this._sourceMap) sourceMap = this.sourceMaps.extractAndRegister(code, filename, hash)

      try {
        instrumented = instrumenter.instrumentSync(code, filename, sourceMap)
      } catch (e) {
        debugLog('failed to instrument ' + filename + ' with error: ' + e.stack)
        if (this.config.exitOnError) {
          console.error('Failed to instrument ' + filename)
          process.exit(1)
        } else {
          instrumented = code
        }
      }

      if (this.fakeRequire) {
        return 'function x () {}'
      } else {
        return instrumented
      }
    }
  }

  _handleJs (code, options) {
    // ensure the path has correct casing (see istanbuljs/nyc#269 and nodejs/node#6624)
    const filename = path.resolve(this.cwd, options.filename)
    return this._maybeInstrumentSource(code, filename) || code
  }

  _addHook (type) {
    const handleJs = this._handleJs.bind(this)
    const dummyMatcher = () => true // we do all processing in transformer
    libHook['hook' + type](dummyMatcher, handleJs, { extensions: this.extensions })
  }

  _addRequireHooks () {
    if (this.hookRequire) {
      this._addHook('Require')
    }
    if (this.hookRunInContext) {
      this._addHook('RunInContext')
    }
    if (this.hookRunInThisContext) {
      this._addHook('RunInThisContext')
    }
  }

  cleanup () {
    if (!process.env.NYC_CWD) rimraf.sync(this.tempDirectory())
  }

  clearCache () {
    if (this.cache) {
      rimraf.sync(this.cacheDirectory)
    }
  }

  createTempDirectory () {
    mkdirp.sync(this.tempDirectory())
    if (this.cache) mkdirp.sync(this.cacheDirectory)

    mkdirp.sync(this.processInfoDirectory())
  }

  reset () {
    this.cleanup()
    this.createTempDirectory()
  }

  _wrapExit () {
    // we always want to write coverage
    // regardless of how the process exits.
    onExit(() => {
      this.writeCoverageFile()
    }, { alwaysLast: true })
  }

  wrap (bin) {
    process.env.NYC_PROCESS_ID = this.processInfo.uuid
    this._addRequireHooks()
    this._wrapExit()
    this._loadAdditionalModules()
    return this
  }

  writeCoverageFile () {
    var coverage = coverageFinder()
    if (!coverage) return

    // Remove any files that should be excluded but snuck into the coverage
    Object.keys(coverage).forEach(function (absFile) {
      if (!this.exclude.shouldInstrument(absFile)) {
        delete coverage[absFile]
      }
    }, this)

    if (this.cache) {
      Object.keys(coverage).forEach(function (absFile) {
        if (this.hashCache[absFile] && coverage[absFile]) {
          coverage[absFile].contentHash = this.hashCache[absFile]
        }
      }, this)
    } else {
      coverage = this.sourceMaps.remapCoverage(coverage)
    }

    var id = this.processInfo.uuid
    var coverageFilename = path.resolve(this.tempDirectory(), id + '.json')

    fs.writeFileSync(
      coverageFilename,
      JSON.stringify(coverage),
      'utf-8'
    )

    this.processInfo.coverageFilename = coverageFilename
    this.processInfo.files = Object.keys(coverage)

    fs.writeFileSync(
      path.resolve(this.processInfoDirectory(), id + '.json'),
      JSON.stringify(this.processInfo),
      'utf-8'
    )
  }

  getCoverageMapFromAllCoverageFiles (baseDirectory) {
    const map = libCoverage.createCoverageMap({})

    this.eachReport(undefined, (report) => {
      map.merge(report)
    }, baseDirectory)

    map.data = this.sourceMaps.remapCoverage(map.data)

    // depending on whether source-code is pre-instrumented
    // or instrumented using a JIT plugin like @babel/require
    // you may opt to exclude files after applying
    // source-map remapping logic.
    if (this.config.excludeAfterRemap) {
      map.filter(filename => this.exclude.shouldInstrument(filename))
    }

    return map
  }

  report () {
    var tree
    var map = this.getCoverageMapFromAllCoverageFiles()
    var context = libReport.createContext({
      dir: this.reportDirectory(),
      watermarks: this.config.watermarks
    })

    tree = libReport.summarizers.pkg(map)

    this.reporter.forEach((_reporter) => {
      tree.visit(reports.create(_reporter, {
        skipEmpty: this.config.skipEmpty,
        skipFull: this.config.skipFull
      }), context)
    })

    if (this._showProcessTree) {
      this.showProcessTree()
    }
  }

  // XXX(@isaacs) Index generation should move to istanbul-lib-processinfo
  writeProcessIndex () {
    const dir = this.processInfoDirectory()
    const pidToUid = new Map()
    const infoByUid = new Map()
    const eidToUid = new Map()
    const infos = fs.readdirSync(dir).filter(f => f !== 'index.json').map(f => {
      try {
        const info = JSON.parse(fs.readFileSync(path.resolve(dir, f), 'utf-8'))
        info.children = []
        pidToUid.set(info.uuid, info.pid)
        pidToUid.set(info.pid, info.uuid)
        infoByUid.set(info.uuid, info)
        if (info.externalId) {
          eidToUid.set(info.externalId, info.uuid)
        }
        return info
      } catch (er) {
        return null
      }
    }).filter(Boolean)

    // create all the parent-child links and write back the updated info
    infos.forEach(info => {
      if (info.parent) {
        const parentInfo = infoByUid.get(info.parent)
        if (parentInfo && !parentInfo.children.includes(info.uuid)) {
          parentInfo.children.push(info.uuid)
        }
      }
    })

    // figure out which files were touched by each process.
    const files = infos.reduce((files, info) => {
      info.files.forEach(f => {
        files[f] = files[f] || []
        files[f].push(info.uuid)
      })
      return files
    }, {})

    // build the actual index!
    const index = infos.reduce((index, info) => {
      index.processes[info.uuid] = {}
      index.processes[info.uuid].parent = info.parent
      if (info.externalId) {
        if (index.externalIds[info.externalId]) {
          throw new Error(`External ID ${info.externalId} used by multiple processes`)
        }
        index.processes[info.uuid].externalId = info.externalId
        index.externalIds[info.externalId] = {
          root: info.uuid,
          children: info.children
        }
      }
      index.processes[info.uuid].children = Array.from(info.children)
      return index
    }, { processes: {}, files: files, externalIds: {} })

    // flatten the descendant sets of all the externalId procs
    Object.keys(index.externalIds).forEach(eid => {
      const { children } = index.externalIds[eid]
      // push the next generation onto the list so we accumulate them all
      for (let i = 0; i < children.length; i++) {
        const nextGen = index.processes[children[i]].children
        if (nextGen && nextGen.length) {
          children.push(...nextGen.filter(uuid => children.indexOf(uuid) === -1))
        }
      }
    })

    fs.writeFileSync(path.resolve(dir, 'index.json'), JSON.stringify(index))
  }

  showProcessTree () {
    var processTree = ProcessInfo.buildProcessTree(this._loadProcessInfos())

    console.log(processTree.render(this))
  }

  checkCoverage (thresholds, perFile) {
    var map = this.getCoverageMapFromAllCoverageFiles()
    var nyc = this

    if (perFile) {
      map.files().forEach(function (file) {
        // ERROR: Coverage for lines (90.12%) does not meet threshold (120%) for index.js
        nyc._checkCoverage(map.fileCoverageFor(file).toSummary(), thresholds, file)
      })
    } else {
      // ERROR: Coverage for lines (90.12%) does not meet global threshold (120%)
      nyc._checkCoverage(map.getCoverageSummary(), thresholds)
    }
  }

  _checkCoverage (summary, thresholds, file) {
    Object.keys(thresholds).forEach(function (key) {
      var coverage = summary[key].pct
      if (coverage < thresholds[key]) {
        process.exitCode = 1
        if (file) {
          console.error('ERROR: Coverage for ' + key + ' (' + coverage + '%) does not meet threshold (' + thresholds[key] + '%) for ' + file)
        } else {
          console.error('ERROR: Coverage for ' + key + ' (' + coverage + '%) does not meet global threshold (' + thresholds[key] + '%)')
        }
      }
    })
  }

  _loadProcessInfos () {
    return fs.readdirSync(this.processInfoDirectory()).map(f => {
      let data
      try {
        data = JSON.parse(fs.readFileSync(
          path.resolve(this.processInfoDirectory(), f),
          'utf-8'
        ))
      } catch (e) { // handle corrupt JSON output.
        return null
      }
      if (f !== 'index.json') {
        data.nodes = []
        data = new ProcessInfo(data)
      }
      return { file: path.basename(f, '.json'), data: data }
    }).filter(Boolean).reduce((infos, info) => {
      infos[info.file] = info.data
      return infos
    }, {})
  }

  eachReport (filenames, iterator, baseDirectory) {
    baseDirectory = baseDirectory || this.tempDirectory()

    if (typeof filenames === 'function') {
      iterator = filenames
      filenames = undefined
    }

    var _this = this
    var files = filenames || fs.readdirSync(baseDirectory)

    files.forEach(function (f) {
      var report
      try {
        report = JSON.parse(fs.readFileSync(
          path.resolve(baseDirectory, f),
          'utf-8'
        ))

        _this.sourceMaps.reloadCachedSourceMaps(report)
      } catch (e) { // handle corrupt JSON output.
        report = {}
      }

      iterator(report)
    })
  }

  loadReports (filenames) {
    var reports = []

    this.eachReport(filenames, (report) => {
      reports.push(report)
    })

    return reports
  }

  tempDirectory () {
    return path.resolve(this.cwd, this._tempDirectory)
  }

  reportDirectory () {
    return path.resolve(this.cwd, this._reportDir)
  }

  processInfoDirectory () {
    return path.resolve(this.tempDirectory(), 'processinfo')
  }
}

module.exports = NYC