RegeneratorRuntime is not defined

Question

I am trying to run Karma-babel-preprocessor and a straight forward ES6 generator:

//require(\'babel/polyfill\');

  describe(\"how Generators work\", functio         


        

Answer 1

I modified karma.conf.js to add browser-polyfill as mentioned in the Docs Link:

files: [
            'node_modules/babel/browser-polyfill.js',
      'test-main.js',
      {pattern: 'tests/*.js', included: true}
    ],

After this modification, the following unit test works in Karma:

  describe("how Generators work", function() {
    it("will allow generator functions", function() {
     /*function* numbers(){
       yield 1;
       yield 2;
       yield 3;
     };*///Simplified syntax does not work

      let numbers = {
        [Symbol.iterator]:function*(){
            yield 1;
            yield 2;
            yield 3;
          }
      }

      let sum = 0;

      for(let num of numbers){
        sum += num;
      }

      expect(sum).toBe(6);
    });
  });