Support JSON line output.

[scotthovestadt]

Summary

JSON output, especially as currently implemented, has a few limitations:

• The size of the output scales directly with the number of tests, or in case of coverage, files in the project. This eventually breaks down and causes OOMs unless a JSON parser capable of streaming is implemented both on Jest's side and the implementation side, which would mean introducing additional dependencies and requiring similar dependencies. Will become even more of a problem as the output size grows.
• We only provide a single JSON response, meaning that there is no feedback until the end and anything we want to output must be held in memory until then. Streaming JSON lines means we can potentially free memory earlier and provide signal earlier to any integrations.
• We push the large JSON object directly to stdout without any chunking. It's possible to overflow the output buffer and cause OOMs in that way.

It's worth noting that the OOMs caused by these issues are not theoretical. :)

Related PR:
#8091

This PR is the first step to resolving these problems. There is clearly still room for improvement-- all output is still batched at the end, for example. All feedback welcomed.

Example output:

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Test plan

• All tests continue to pass.
• Built a real integration against this.
• WIP: adding a few json-line specific tests

[scotthovestadt]

This is a breaking change to jest-phabricator, necessary to support the JSON lines format.

Technically, before it was breaking the contract provided by TypeScript by just returning an any... I've typed it correctly now.

[scotthovestadt]

Why weren't these being imported from @jest/test-result before?

[SimenB]

Missed it when refactoring. Will be good to trim out exports from jest-util for 25

[SimenB]

Missing changelog 😀
I'm also missing a test or two, but the implementation looks solid to me 👌

[SimenB]

?

[scotthovestadt]

It's now async, since for JSON lines it'll now wait on stdout for buffering output.

[SimenB]

This whole function is async already, awaiting here just creates an extra promise instead of returning the promise from processResults

[thymikee]

Looks good! Do you think it makes sense having this as a reporter as well?

[github-actions]

This PR is stale because it has been open 1 year with no activity. Remove stale label or comment or this will be closed in 30 days.

[github-actions]

This PR was closed because it has been stalled for 30 days with no activity. Please open a new PR if the issue is still relevant, linking to this one.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.