[Feature]: Allow config `maxWorkers` per project

[fisker]

🚀 Feature Proposal

If I didn't get it wrong, currently we don't allow config maxWorkers in projects

Allow config maxWorkers per project

modules.exports = {
	projects: [
			{
      			"displayName": "test",
				maxWorkers: 1,
    		},
			{
      			"displayName": "another test",
				maxWorkers: 4,
    		},
			{
      			"displayName": "another test",
				// inherit maxWorkers: 2 or cli flag?
    		},
	],
	maxWorkers: 2
}

Motivation

We(Prettier) using jest-light-runner now, it use different environment to run test when maxWorkers === 1

for some reason I can't use worker to run some of our tests, but some are fine to use workers.

If we add support for this, maybe some change in jest-light-runner can make different test file run on different environment.

//cc @nicolo-ribaudo

Example

No response

Pitch

N/A

[SimenB]

Hmm, not sure about this one. Most CLI options are global. What should happen if it's provided via CLI flag? Override project specific ones?

[fisker]

I'm not sure about that, or maybe

import jestLightRunner from "jest-light -runner"

modules.exports = {
	projects: [
		{
      			"displayName": "test",
		         "runner": jestLightRunner(),
    		},
		{
      			"displayName": "another test",
	                "runner": jestLightRunner({inBand: true}),
    		},
	],
}
"

makes more sense?

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