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app_vue/node_modules/@vue/cli-shared-utils/lib/env.js

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+const { execSync } = require('child_process')
+const fs = require('fs')
+const path = require('path')
+const LRU = require('lru-cache')
+const semver = require('semver')
+
+let _hasYarn
+const _yarnProjects = new LRU({
+  max: 10,
+  maxAge: 1000
+})
+let _hasGit
+const _gitProjects = new LRU({
+  max: 10,
+  maxAge: 1000
+})
+
+// env detection
+exports.hasYarn = () => {
+  if (process.env.VUE_CLI_TEST) {
+    return true
+  }
+  if (_hasYarn != null) {
+    return _hasYarn
+  }
+  try {
+    execSync('yarn --version', { stdio: 'ignore' })
+    return (_hasYarn = true)
+  } catch (e) {
+    return (_hasYarn = false)
+  }
+}
+
+exports.hasProjectYarn = (cwd) => {
+  if (_yarnProjects.has(cwd)) {
+    return checkYarn(_yarnProjects.get(cwd))
+  }
+
+  const lockFile = path.join(cwd, 'yarn.lock')
+  const result = fs.existsSync(lockFile)
+  _yarnProjects.set(cwd, result)
+  return checkYarn(result)
+}
+
+function checkYarn (result) {
+  if (result && !exports.hasYarn()) throw new Error(`The project seems to require yarn but it's not installed.`)
+  return result
+}
+
+exports.hasGit = () => {
+  if (process.env.VUE_CLI_TEST) {
+    return true
+  }
+  if (_hasGit != null) {
+    return _hasGit
+  }
+  try {
+    execSync('git --version', { stdio: 'ignore' })
+    return (_hasGit = true)
+  } catch (e) {
+    return (_hasGit = false)
+  }
+}
+
+exports.hasProjectGit = (cwd) => {
+  if (_gitProjects.has(cwd)) {
+    return _gitProjects.get(cwd)
+  }
+
+  let result
+  try {
+    execSync('git status', { stdio: 'ignore', cwd })
+    result = true
+  } catch (e) {
+    result = false
+  }
+  _gitProjects.set(cwd, result)
+  return result
+}
+
+let _hasPnpm
+let _pnpmVersion
+const _pnpmProjects = new LRU({
+  max: 10,
+  maxAge: 1000
+})
+
+function getPnpmVersion () {
+  if (_pnpmVersion != null) {
+    return _pnpmVersion
+  }
+  try {
+    _pnpmVersion = execSync('pnpm --version', {
+      stdio: ['pipe', 'pipe', 'ignore']
+    }).toString()
+    // there's a critical bug in pnpm 2
+    // https://github.com/pnpm/pnpm/issues/1678#issuecomment-469981972
+    // so we only support pnpm >= 3.0.0
+    _hasPnpm = true
+  } catch (e) {}
+  return _pnpmVersion || '0.0.0'
+}
+
+exports.hasPnpmVersionOrLater = (version) => {
+  if (process.env.VUE_CLI_TEST) {
+    return true
+  }
+  return semver.gte(getPnpmVersion(), version)
+}
+
+exports.hasPnpm3OrLater = () => {
+  return this.hasPnpmVersionOrLater('3.0.0')
+}
+
+exports.hasProjectPnpm = (cwd) => {
+  if (_pnpmProjects.has(cwd)) {
+    return checkPnpm(_pnpmProjects.get(cwd))
+  }
+
+  const lockFile = path.join(cwd, 'pnpm-lock.yaml')
+  const result = fs.existsSync(lockFile)
+  _pnpmProjects.set(cwd, result)
+  return checkPnpm(result)
+}
+
+function checkPnpm (result) {
+  if (result && !exports.hasPnpm3OrLater()) {
+    throw new Error(`The project seems to require pnpm${_hasPnpm ? ' >= 3' : ''} but it's not installed.`)
+  }
+  return result
+}
+
+const _npmProjects = new LRU({
+  max: 10,
+  maxAge: 1000
+})
+exports.hasProjectNpm = (cwd) => {
+  if (_npmProjects.has(cwd)) {
+    return _npmProjects.get(cwd)
+  }
+
+  const lockFile = path.join(cwd, 'package-lock.json')
+  const result = fs.existsSync(lockFile)
+  _npmProjects.set(cwd, result)
+  return result
+}
+
+// OS
+exports.isWindows = process.platform === 'win32'
+exports.isMacintosh = process.platform === 'darwin'
+exports.isLinux = process.platform === 'linux'
+
+const browsers = {}
+let hasCheckedBrowsers = false
+
+function tryRun (cmd) {
+  try {
+    return execSync(cmd, {
+      stdio: [0, 'pipe', 'ignore'],
+      timeout: 10000
+    }).toString().trim()
+  } catch (e) {
+    return ''
+  }
+}
+
+function getLinuxAppVersion (binary) {
+  return tryRun(`${binary} --version`).replace(/^.* ([^ ]*)/g, '$1')
+}
+
+function getMacAppVersion (bundleIdentifier) {
+  const bundlePath = tryRun(`mdfind "kMDItemCFBundleIdentifier=='${bundleIdentifier}'"`)
+
+  if (bundlePath) {
+    return tryRun(`/usr/libexec/PlistBuddy -c Print:CFBundleShortVersionString ${
+      bundlePath.replace(/(\s)/g, '\\ ')
+    }/Contents/Info.plist`)
+  }
+}
+
+exports.getInstalledBrowsers = () => {
+  if (hasCheckedBrowsers) {
+    return browsers
+  }
+  hasCheckedBrowsers = true
+
+  if (exports.isLinux) {
+    browsers.chrome = getLinuxAppVersion('google-chrome')
+    browsers.firefox = getLinuxAppVersion('firefox')
+  } else if (exports.isMacintosh) {
+    browsers.chrome = getMacAppVersion('com.google.Chrome')
+    browsers.firefox = getMacAppVersion('org.mozilla.firefox')
+  } else if (exports.isWindows) {
+    // get chrome stable version
+    // https://stackoverflow.com/a/51773107/2302258
+    const chromeQueryResult = tryRun(
+      'reg query "HKLM\\Software\\Google\\Update\\Clients\\{8A69D345-D564-463c-AFF1-A69D9E530F96}" /v pv /reg:32'
+    ) || tryRun(
+      'reg query "HKCU\\Software\\Google\\Update\\Clients\\{8A69D345-D564-463c-AFF1-A69D9E530F96}" /v pv /reg:32'
+    )
+    if (chromeQueryResult) {
+      const matched = chromeQueryResult.match(/REG_SZ\s+(\S*)$/)
+      browsers.chrome = matched && matched[1]
+    }
+
+    // get firefox version
+    // https://community.spiceworks.com/topic/111518-how-to-determine-version-of-installed-firefox-in-windows-batchscript
+    const ffQueryResult = tryRun(
+      'reg query "HKLM\\Software\\Mozilla\\Mozilla Firefox" /v CurrentVersion'
+    )
+    if (ffQueryResult) {
+      const matched = ffQueryResult.match(/REG_SZ\s+(\S*)$/)
+      browsers.firefox = matched && matched[1]
+    }
+  }
+
+  return browsers
+}