injecting-mock-window

node.js

// this package empowers babel-register
const addHook = require('pirates').addHook;

function matcher(filename) {
  // do not apply to mocks 
  return fileName.indexOf('src/mocks') < 0;
}

const PREPEND_TEXT = `
 const window = require('src/mocks/window.js');
 const document = require('src/mocks/document.js');
`;
// you may use `require-control` to teach node.js to understand aliases.

// just prepend each js file with a few imports
addHook(
  (code, filename) => PREPEND_TEXT + code;
  { exts: ['.js'], matcher }
);

webpack.conf.js

// just add a ProvidePlugin
// it will inject imports to the files
// where those variables are NOT defined.
new webpack.ProvidePlugin({
  window: 'give-me-a-window',
  document: 'give-me-a-document',
  // ...
});

// just spin up alias
resolve: {
        alias: {
            'give-me-a-window': 'src/mocks/window.js',
        }
}