Error while trying to run scripts: regeneratorRuntime is not defined

Question

I have problem to run a test in mocha and chai. I am getting an error:

Error while trying to run scripts: regeneratorRuntime is not defined

and 500 status internal error.

I've thought it's some kind of a problem with babel configuration and tested functionalities manually and it's working.

package.json:

json


     "scripts": {
            "test": "./node_modules/.bin/mocha --require @babel/register --recursive './test/**/*.spec.js'"
          }

.babelrc:

json

    {
      "presets": [
        "@babel/preset-env"
      ]
    }

test:

javascript
import chai from "chai";
import server from "../../index";
import chaiHttp from "chai-http";
const { expect } = chai;

chai.use(chaiHttp);

function validResponse(err, res, status) {
  expect(err).to.be.null;
  expect(res).to.have.status(status);
  expect(res).to.be.json;
}

describe("get one page of recipe", function() {

  it("should return page with recipe", function(done) {
    chai
      .request(server)
      .get("/api/recipe/page/1")
      .end((err, res) => {
        validResponse(err, res, 200);
        console.log(res.body)
        expect(res.body).to.be.an("object");
        done();
      });
  });
});

Possible duplicate of [Babel 6 regeneratorRuntime is not defined](https://stackoverflow.com/questions/33527653/babel-6-regeneratorruntime-is-not-defined) — Håken Lid, Jul 26 '19 at 18:03

Ramaraja · Accepted Answer · 2019-08-03T22:03:11.573

2

This is likely because you are using a feature that's not supported properly by the Babel presets configured.

Try installing babel-polyfill,

npm i -D babel-polyfill

And then include it in your startup file,

import 'babel-polyfill';

edited Aug 03 '19 at 22:03

answered Jul 26 '19 at 11:44

Ramaraja

2,526
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21

Ok, but i am using es6 not es5, is it important or no ? – Kurs Google Jul 26 '19 at 18:55
Do you know any tutorial that teach me how to use mocha, chai and configure it with ES6 ? – Kurs Google Jul 26 '19 at 19:10
@KursGoogle It also downloads other peer dependencies that could help solve your issue. Try it and let me know if it works. And about the tutorial, I learnt from Pluralsight. – Ramaraja Jul 27 '19 at 06:48
Can you look at question - https://stackoverflow.com/questions/57340270/expressjs-doesnt-fires-next-routes-in-app-use also ? – Kurs Google Aug 03 '19 at 16:39
No wait. I accept it too quick. Still the same error. – Kurs Google Aug 03 '19 at 19:33
Ok, nevermind, working but with import 'babel-polyfill'; - you can edit your post for next people ? – Kurs Google Aug 03 '19 at 19:45

Error while trying to run scripts: regeneratorRuntime is not defined

1 Answers1