Webpack dependency injection loader

inject.js

var regex = /require\(([^\)]+)\)/g;

module.exports = function inject(src) {
  this.cacheable();
  return [
    'module.exports = function inject(__injections__) {',
    '  var module = {exports: {}};',
    '  ' + src.replace(regex, '(__injections__[$1] || $&)'),
    '  return module.exports;',
    '}'
  ].join("\n");
}

output.md

The output will look something like this.

var Square = (__injections__['dependency'] || __webpack_require__(4));

And the MockDependency will be used

square.js

import React from 'react';
import dependency from 'dependency';

export default React.createClass({
  render() {
    return <div/>
  }
});

square_test.js

import SquareInjector from './inject!./square';
import MockDependency from './mock-dependency';

let Square = SquareInjector({
  dependency: MockDependency
});