Jest: Source maps are mis-aligned

[moltar]

🐛 Bug Report

Jest errors that show line numbers and code snippets aren't showing the right thing.

This seems to happen by merely including another package that already loads source-map-support module prior, for example pino-caller. You can see the code for pino-caller is very simple, and in fact no code paths get triggered, other than just the loading of the module itself.

When I comment out the require line in pino-caller, the source maps align fine.

I've looked at other source maps issues here, and none of them seem to be relevant to this.

To Reproduce

Steps to reproduce the behavior:

require('pino-caller')

describe('Name of the group', () => {
  it('should work', () => {
    // comment

    throw new Error('foo')
  })
})

Results in:

      4 |   it('should work', () => {
      5 |     // comment
    > 6 |
        | ^
      7 |     throw new Error('foo')
      8 |   })
      9 | })

      at Object.<anonymous> (test/foo.test.ts:6:15)

Expected behavior

To point to the right line of code.

Link to repl or repo (highly encouraged)

envinfo

  System:
    OS: macOS 10.15.4
    CPU: (8) x64 Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz
  Binaries:
    Node: 12.18.2 - ~/.nvm/versions/node/v12.18.2/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.6 - ~/.nvm/versions/node/v12.18.2/bin/npm
  npmPackages:
    jest: 26.1.0 => 26.1.0

[Marik-D]

Repo with minimal code to reproduce: https://github.com/Marik-D/jest-source-map-issue

require('source-map-support').install() //commenting out this line makes the issue dissapear






test('test', () => {
  expect(false).toEqual(true)
})

Looks like just using jest with source-map-support is enough to reproduce.

Also, console logs and node's assert are unaffected by this issue.

[AndinoJamesV]

So I dug into the code and where Istanbul is working it should not be.

Also I doubt It will be fixed any time soon coverage is built into V8 directly for example implementation see
https://www.npmjs.com/package/c8