Yarn: Cannot read property 'config' of undefined".

[crashbell]

Latest version: 0.27.5

Do you want to request a feature or report a bug?
A Bug

What is the current behavior?
Install dependencies with command rm -rf node_modules && yarn

If the current behavior is a bug, please provide the steps to reproduce.
The installation failed with error: node_modules/flow-bin: Cannot read property 'config' of undefined".
In the verbose mode, I got this stack trace:

verbose 23.71 TypeError: /Users/project/node_modules/flow-bin: Cannot read property 'config' of undefined
    at /usr/local/Cellar/yarn/0.27.5/libexec/lib/yarn-cli.js:34601:185
    at Generator.next (<anonymous>)
    at step (/usr/local/Cellar/yarn/0.27.5/libexec/lib/yarn-cli.js:91:30)
    at /usr/local/Cellar/yarn/0.27.5/libexec/lib/yarn-cli.js:102:13
    at <anonymous>

I tried to print out the config value and got this:

Config {
  constraintResolver: PackageConstraintResolver { reporter: undefined, config: [Circular] },
  requestManager:
   RequestManager {
     offlineNoRequests: false,
     _requestCaptureHar: null,
     _requestModule: null,
     offlineQueue: [],
     captureHar: false,
     httpsProxy: '',
     ca: null,
     httpProxy: '',
     strictSSL: true,
     userAgent: 'yarn/0.27.5 npm/? node/v8.1.3 darwin x64',
     reporter: undefined,
     running: 0,
     queue: [],
     cache: {},
     max: 8,
     maxRetryAttempts: 5,
     timeout: 30000,
     cert: '',
     key: '' },
  reporter: undefined,
  rootModuleFolders: [],
  registryFolders: [],
  linkedModules: [],
  registries: {},
  cache: {},
  cwd: '/Users/crashbell/.config/yarn/global',
  looseSemver: true,
  commandName: '',
  preferOffline: false,
  modulesFolder: undefined,
  globalFolder: '/Users/crashbell/.config/yarn/global',
  linkFolder: '/Users/crashbell/.config/yarn/link',
  offline: false,
  binLinks: true,
  ignorePlatform: false,
  ignoreScripts: false,
  disablePrepublish: false,
  nonInteractive: false,
  workspaceRootFolder: null,
  lockfileFolder: '/Users/project',
  networkConcurrency: 8,
  childConcurrency: 5,
  networkTimeout: 30000,
  _cacheRootFolder: '/Users/crashbell/Library/Caches/Yarn',
  workspacesEnabled: false,
  pruneOfflineMirror: false,
  enableMetaFolder: false,
  enableLockfileVersions: false,
  linkFileDependencies: false,
  cacheFolder: '/Users/crashbell/Library/Caches/Yarn/v1',
  tempFolder: '/Users/crashbell/Library/Caches/Yarn/v1/.tmp',
  production: false }

What is the expected behavior?
Installation should work without error.

Please mention your node.js, yarn and operating system version.
Node: v8.1.3
Mac OSX: 10.12.5 (16F73)

[crashbell]

The issue was gone when I ran a bunch of commands:

cd /Users/crashbell/Library/Caches/Yarn
rm -rf v1
npm install -g node-gyp

Maybe yarn cache folder was corrupted somehow.

[baotn166]

That works for me, thank you.