Added missing dependency 'core-js'

[AndrewKishino]

Upon cloning the directory and running npm install and npm start you receive an error for a missing module:

Error: Cannot find module 'core-js/library/fn/is-iterable'
    at Function.Module._resolveFilename (module.js:339:15)
    at Function.Module._load (module.js:290:25)
    at Module.require (module.js:367:17)
    at require (internal/module.js:16:19)
    at Object.<anonymous> (/Users/andrewkishino/Documents/project_templates/react-template/build/webpack:/external "core-js/library/fn/is-iterable":1:1)
    at __webpack_require__ (/Users/andrewkishino/Documents/project_templates/react-template/build/webpack:/webpack/bootstrap 416f15863871a726e916:19:1)
    at Object.<anonymous> (/Users/andrewkishino/Documents/project_templates/react-template/build/webpack:/~/babel-runtime/core-js/is-iterable.js:1:19)
    at __webpack_require__ (/Users/andrewkishino/Documents/project_templates/react-template/build/webpack:/webpack/bootstrap 416f15863871a726e916:19:1)
    at Object.<anonymous> (/Users/andrewkishino/Documents/project_templates/react-template/build/webpack:/~/babel-runtime/helpers/slicedToArray.js:5:1)
    at __webpack_require__ (/Users/andrewkishino/Documents/project_templates/react-template/build/webpack:/webpack/bootstrap 416f15863871a726e916:19:1)

The issue is due to 'core-js' missing from package.json.

[koistya]

This dependency is not used in the project. Maybe you need to remove node_modules folder and run npm install again..

[gentisaliu]

I get this error too.

[koistya]

@gentisaliu can you please check what your Node.js and npm versions are?

$ node --version && npm --version

[gentisaliu]

node: v4.2.6
npm: 2.14.12

[koistya]

Perhaps npm v2.x is not compatible with some of the packages referenced in the project. Can you update it to v3.x?

$ npm install -g npm@latest
$ rm -rf node_modules
$ npm install

[fpetitit]

Using Node 5/NPM 3 instead of 4/2 has solved the problem for me.
Thanks !