Resetting the webpack module cache

reset_webpack.js

// Necessary for the karma-webpack alternative use-case https://github.com/webpack/karma-webpack#alternative-usage
// 
// With the alternative usage setup your tests will be bundled with all other modules and tests.
// Each test will not have its own bundle of modules and tests have to handle cleaning up module state in between tests.
// 
// This ends up being much better in the long run because each test can have a large number of deps and a single test
// may end up being very large and using a lot of memory and eventually cause OOM exceptions in the default usage setup.
// 
// This solves that problem

jasmine.getEnv().topSuite().afterEach({
  fn: () => { resetModuleCache(); }
});

function resetModuleCache() {
  // assuming this module is compiled by webpack the 'magic' webpack require will be available
  // and will expose the module cache as a property on the require method
  let moduleCache = __webpack_require__.c;
  for (let id in moduleCache) {
    delete moduleCache[id];
  }
}