Error Unexpected token (Object spread) when running jest with --coverage OR transform key

[wilhelmklopp]

Cross posting from kulshekhar/ts-jest#386 as it seems like it's not a ts-jest issue

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Issue

When I run jest with coverage turned on jest --coverage and the tranform key present in package.json
e.g.:

"transform": {
      "^.+\\.tsx?$": "ts-jest"
    },

every test that involves an object spread operator fails.

If I either:

• run jest without --coverage
  or
• run jest without the transform key present in package.json

all tests pass fine (in the second case, minus of course typescript tests, which I need ts-jest's transform for 😬 )

I'm running:
jest: 21.2.1
ts-jest: 21.2.4
node: v8.9.0
npm: 5.6.0
mac: 10.12.6 (16G29) (but problem occurring in stock Travis builds as well)

I am not using any kind of babel config, although while investigating this problem I tried using babel-plugin-transform-object-rest-spread, but it didn't seem to have made a difference.

Minimal Repo that reproduces the issue

Link to a minimal repo that reproduces this issue. There's also a branch that shows what happens when transform is removed from package.json
Travis is configured on this repo. Relevant build

Additional background info

Prior to adding ts-jest to the setup, I had this same problem with jest as well, but this PR (and subsequent release back in September) fixed it: #4519

Any thoughts on what the problem might be? 🙇

[wilhelmklopp]

Fixed by modifying transform key to pass both ts and js files to ts-jest, not just ts files.

Details

Sorry for the noise 🙏

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