babel-runtime

when doing npm start :

ERROR in ./src/js/modules/msg.js
Module not found: Error: Can't resolve 'babel-runtime/helpers/typeof' in '/Users/x/dev/testing/salsita/chrome-extension-skeleton/src/js/modules'
 @ ./src/js/modules/msg.js 1:0-51
 @ ./src/js/devTools.js

ERROR in ./src/js/modules/runner.js
Module not found: Error: Can't resolve 'babel-runtime/core-js/json/stringify' in '/Users/x/dev/testing/salsita/chrome-extension-skeleton/src/js/modules'
 @ ./src/js/modules/runner.js 1:0-67
 @ ./src/js/options.js

[heedrox]

I had same problem; I fixed it adding to devDependencies in package.json
"babel-runtime": "^6.1.4"

I also had to update to mocha@2.4.5 to make it work with mocha-webpack@0.7.0