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Added babel-runtime dependency to deduplicate dependencies when using yarn

Merged Administrator requested to merge github/fork/jkimbo/yarn-package-size into master

Created by: jkimbo

By adding babel-runtime as a top level dependency (even though it is not directly depended on) forces yarn to hoist the version to the top which reduces the resultant node_modules directory size significantly. The npm install is unaffected.

npm baseline:

  114.7 MiB [##########] /node_modules
   64.0 KiB [          ]  README.md
   32.0 KiB [          ] /public
   24.0 KiB [          ] /src
    4.0 KiB [          ]  package.json
    4.0 KiB [          ]  .gitignore

npm with patch:

  114.7 MiB [##########] /node_modules
   64.0 KiB [          ]  README.md
   32.0 KiB [          ] /public
   24.0 KiB [          ] /src
    4.0 KiB [          ]  package.json
    4.0 KiB [          ]  .gitignore

yarn baseline:

  560.0 MiB [##########] /node_modules
  216.0 KiB [          ]  yarn.lock
   64.0 KiB [          ]  README.md
   32.0 KiB [          ] /public
   24.0 KiB [          ] /src
    4.0 KiB [          ]  package.json
    4.0 KiB [          ]  .gitignore

yarn with patch:

  150.0 MiB [##########] /node_modules
  216.0 KiB [          ]  yarn.lock
   64.0 KiB [          ]  README.md
   32.0 KiB [          ] /public
   24.0 KiB [          ] /src
    4.0 KiB [          ]  package.json
    4.0 KiB [          ]  .gitignore

More info: https://github.com/facebookincubator/create-react-app/issues/1397