getVersion is not defined

[hediet]

🐛 Bug Report

Jest v24 crashes with "getVersion" is not defined.

To Reproduce

See source code.

Expected behavior

Jest does not crash.

Issue in source

This line requires cli.
But cli itself requires jest here. Clearly, getVersion is not exported at this point.

Run npx envinfo --preset jest

Paste the results here:

System:
    OS: Windows 10
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
  Binaries:
    Yarn: 1.10.1 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD

[rubennorte]

I can't repro the error. Can you share what you executed when it crashed?

[SimenB]

Not sure what's happening, but one thing that's bitten me before is mismatching jest installations.

Make sure to not have both jest and jest-cli installed at the same time (you just need jest), and that you're not using CRA (CRA ships with its own version of Jest, so you shouldn't update it yourself 🙂)

[hediet]

Our setup is somewhat complex, I basically ran jest --config our-config.js, and our-config.js loads typescript using ts-node, I can try to further simplify that to understand where the issue comes from.

But regardless of how I ran it and what my setup is, why should it work at all? What breaks the cyclic reference between jest.js and cli/index.js?

[SimenB]

getVersion is a function (which is not invoked until later), and node handles cyclic requires

[SimenB]

I 100% agree it's not ideal, of course 🙂

[hediet]

@SimenB stepping through the transpiled code, it seems like nodejs is first executing jest/jest.js until there:

'use strict';

var _package = require('../package.json');

var _SearchSource = _interopRequireDefault(require('./SearchSource'));

var _TestScheduler = _interopRequireDefault(require('./TestScheduler'));

var _TestWatcher = _interopRequireDefault(require('./TestWatcher'));

var _cli = require('./cli'); // === here ===

function _interopRequireDefault(obj) {
  return obj && obj.__esModule ? obj : {default: obj};
}
/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 *
 */
// === this is not executed yet ===
module.exports = {
  SearchSource: _SearchSource.default,
  TestScheduler: _TestScheduler.default,
  TestWatcher: _TestWatcher.default,
  getVersion: () => _package.version,
  run: _cli.run,
  runCLI: _cli.runCLI
};

Where it then descends into jest/cli/index.js:

function _asyncToGenerator(fn) {
  return function() {
    var self = this,
      args = arguments;
    return new Promise(function(resolve, reject) {
      var gen = fn.apply(self, args);
      function _next(value) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, 'next', value);
      }
      function _throw(err) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, 'throw', err);
      }
      _next(undefined);
    });
  };
}
const _require = require('../jest'),
  getVersion = _require.getVersion;
// === at this point, `_require` equals `{}`, so getVersion is undefined. ===
function run(_x, _x2) {
  return _run2.apply(this, arguments);
}

Clearly, here, it then crashes:

const buildArgv = (maybeArgv, project) => {

  const version =
    getVersion() + // === getVersion is still undefined ===
    (__dirname.includes(`packages${_path().default.sep}jest-cli`)
      ? '-dev'
      : '');
// [...]

[SimenB]

Not sure what's going on - I'm unable to reproduce.

$ mkdir 24
$ cd 24
$ yarn init -y
# ...
$ yarn add jest
# ...
$ yarn jest --version
yarn run v1.13.0
$ /Users/simen/24/node_modules/.bin/jest --version
24.0.0

So a reproduction would be awesome!

It might very well be that ts-node is somewhat buggy and doesn't work in the same way node does. Why do you need ts-node?

[hediet]

We need ts-node because our configuration is written in typescript. I try to make it reproducible.
But clearly there is an issue in the transpiled source, isn't it?

[SimenB]

However, installing ts-node still works

$ yarn add ts-node typescript
$ npx ts-node node_modules/.bin/jest --version
24.0.0

[hediet]

Further debugging showed that the issue is the order in which the modules are loaded. If jest/cli/index is loaded first, everything works. If jest/jest.js is loaded first, it crashes due to the described reasons. I am currently investigating why jest/jest.js is loaded before jest/cli/index in our setup.

Anyways, code should not break if it is loaded in a different order than the default case, especially if the order is up to the caller of the API.

[jeysal]

For reference: Whatever the circumstances this appears under may be, reason why it started showing in v24 is this PR.

[eliw00d]

I'm running into this same error but only when running jest programmatically (require('jest').run(argv)). When I yarn jest it works fine.

[hediet]

I'm running into this same error but only when running jest programmatically (require('jest').run(argv)). When I yarn jest it works fine.

Thank you, we also run it programmatically. That seems to be it.

[SimenB]

Ah, ok. We need #7696 😅

I'll put together a PR