Inline snapshots fail with most-recent babel, jest, and babel-plugin-source-map-support

[mikestopcontinues]

🐛 Bug Report

Inline snapshots don't work with this combo of packages. This may be related to #6744, but it happens even without matching the criteria in that ticket.

 Jest: Couldn't locate all inline snapshots.

      at Object.parse (node_modules/jest-snapshot/build/InlineSnapshots.js:267:11)
      at Object.parse (node_modules/prettier/index.js:13625:19)
      at coreFormat (node_modules/prettier/index.js:14899:14)
      at format (node_modules/prettier/index.js:15131:14)
      at node_modules/prettier/index.js:57542:12
      at Object.format (node_modules/prettier/index.js:57562:12)

To Reproduce

Steps to reproduce the behavior:

1. Install most-recent babel, jest, and babel-plugin-source-map-support
2. Try running this test:

test('simply fails', async () => {
  expect({key: [1, '2', null]}).toMatchInlineSnapshot();
});

Link to repl or repo (highly encouraged)

https://repl.it/@stopcontinues/inline-snapshots-busted

envinfo

  System:
    OS: macOS 11.2.2
    CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
  Binaries:
    Node: 15.5.1 - ~/.nvm/versions/node/v15.5.1/bin/node
    Yarn: 1.22.5 - /usr/local/bin/yarn
    npm: 7.5.2 - ~/.nvm/versions/node/v15.5.1/bin/npm

[spalger]

I'm experiencing this as well, I've verified that babel-jest is producing valid source maps (pulled the sourcemap out of babel-jest via the inspector and checked with http://sokra.github.io/source-map-visualization/) but then source-map-support isn't able to find those source maps when toMatchInlineSnapshot() is called so the new Error().stack isn't correct and the correct call can't be found. It also seems that source-map-support is installed several times and there are several instances of that module... which might be the root problem here...

Wow, yeah, one of the files imported by my tests had source-map-support/register in it which seems to have broken it, but removing that import fixed it!

[SimenB]

Jest handles installation of sourcemaps itself, so you should remove any source-map-support usage in your own code when running tests.

(if you need it for your app, you should set it up in the entrypoint of it, not every single source file, but that's really something to discuss here 🙂)

[github-actions]

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