$ yarn
yarn install v0.27.5
info No lockfile found.
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
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info This package requires node-gyp, which is not currently installed. Yarn will attempt to automatically install it. If this fails, you can run "yarn global add node-gyp" to manually install it.
error An unexpected error occurred: "/Users/moretti/Coding/Bucket/yarn-node-sass-bug/node_modules/node-sass: Cannot read property 'config' of undefined".
info If you think this is a bug, please open a bug report with the information provided in "/Users/moretti/.config/yarn/global/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.