requires global install of yarn

[ukuhnhardt]

this module should not depend on a global install of yarn

$ ./node_modules/.bin/gulp --gulpfile gulpfile-yarn.js yarn
events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: Can't yarn! `yarn` doesn't seem to be installed.
    at /Users/ulrichk/github-ui/self-service-ui/node_modules/gulp-yarn/lib/utils/commandRunner.js:24:13
    at F (/Users/ulrichk/github-ui/self-service-ui/node_modules/which/which.js:68:16)
    at E (/Users/ulrichk/github-ui/self-service-ui/node_modules/which/which.js:80:29)
    at /Users/ulrichk/github-ui/self-service-ui/node_modules/which/which.js:89:16
    at /Users/ulrichk/github-ui/self-service-ui/node_modules/isexe/index.js:42:5
    at /Users/ulrichk/github-ui/self-service-ui/node_modules/isexe/mode.js:8:5
    at FSReqWrap.oncomplete (fs.js:149:21)
Emitted 'error' event at:
    at DestroyableTransform.onerror (/Users/ulrichk/github-ui/self-service-ui/node_modules/gulp/node_modules/vinyl-fs/node_modules/readable-stream/lib/_stream_readable.js:558:12)
    at DestroyableTransform.emit (events.js:182:13)
    at onwriteError (/Users/ulrichk/github-ui/self-service-ui/node_modules/readable-stream/lib/_stream_writable.js:449:12)
    at onwrite (/Users/ulrichk/github-ui/self-service-ui/node_modules/readable-stream/lib/_stream_writable.js:470:11)
    at WritableState.onwrite (/Users/ulrichk/github-ui/self-service-ui/node_modules/readable-stream/lib/_stream_writable.js:180:5)
    at DestroyableTransform.afterTransform (/Users/ulrichk/github-ui/self-service-ui/node_modules/readable-stream/lib/_stream_transform.js:93:3)
    at /Users/ulrichk/github-ui/self-service-ui/node_modules/gulp-yarn/lib/index.js:72:32
    at /Users/ulrichk/github-ui/self-service-ui/node_modules/gulp-yarn/lib/utils/commandRunner.js:24:4
    at F (/Users/ulrichk/github-ui/self-service-ui/node_modules/which/which.js:68:16)
    at E (/Users/ulrichk/github-ui/self-service-ui/node_modules/which/which.js:80:29)

[warapitiya]

Hi @ukuhnhardt: To open the discussion, I believe this must have a configuration logic to get "What version of Yarn needed" and also a sandbox yarn to install dependencies. I like to know how other devs think about this.