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Adding Sinon to WebPack

• Open your project (if you're using WebPack, obviously)

• npm install sinon --save-dev

• You should now have Sinon in your node modules and listed in your package.json file

• In your tests, require Sinon: var sinon = require('sinon');

• You should see a strange error in your console, when you open your testing file. If you google that error and the words 'sinon' and 'webpack' you should see a number of Github issues.

  • Evidently, WebPack and Sinonjs have not been playing nicely for some time
  • Sinon doesn't export itself correctly when webpacked - or at least, so says the github issue commenters
  • We can fix it, we have the technology

• First, if you don't have it already, you'll need to install imports-loader

  • npm install imports --save-dev

• Now open your webpack.config.js file and look for the module: section. It should look something like this:

  module: {
    loaders: [
      { test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader' },
      { test: /\.css$/, loader: "style!css" },
      { test: /\.scss$/, loader: "style!css!sass" }
    ]
  },

• Because of the afor mentioned loading issues, you will have to specifically tell webpack how to import sinonjs. Add the following line to the loaders block:

  • { test: /sinon\.js$/, loader: "imports?define=>false,require=>false"}

• Now that we are loading Sinon manually, we have to specify in our tests that we should use the built package.

  • Replace the var sinon = require('sinon'); with var sinon = require('sinon/pkg/sinon'); in your tests

• You can find the source of this solution and learn more about the problem in this webpack issue thread