feat(reporters): add static filepath property to all reporters

[SimenB]

Summary

https://github.com/jevakallio/jest-clean-console-reporter documents a pattern of doing

    // Overriding config.reporters wipes out default reporters, so
    // we need to restore the summary reporter
    "@jest/reporters/build/SummaryReporter",

This won't work in Jest 27 due to #9921.

$ node -p 'require("@jest/reporters/build/SummaryReporter")'

internal/modules/cjs/loader.js:438
      throw e;
      ^

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './build/SummaryReporter' is not defined by "exports" in /Users/simen/repos/jest/node_modules/@jest/reporters/package.json
    at throwExportsNotFound (internal/modules/esm/resolve.js:290:9)
    at packageExportsResolve (internal/modules/esm/resolve.js:513:3)
    at resolveExports (internal/modules/cjs/loader.js:432:36)
    at Function.Module._findPath (internal/modules/cjs/loader.js:472:31)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:867:27)
    at Function.Module._load (internal/modules/cjs/loader.js:725:27)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at [eval]:1:1
    at Script.runInThisContext (vm.js:133:18) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

This change allows one to do

const {SummaryReporter} = require('@jest/reporters');

// this absolute path can be passed to `require`
const path = SummaryReporter.filepath;

/cc @jevakallio

Test plan

Tested in the shell 😅

$ node -p 'require("@jest/reporters").SummaryReporter.filename'

/Users/simen/repos/jest/packages/jest-reporters/build/SummaryReporter.js

$ node -p 'require(require("@jest/reporters").SummaryReporter.filename)'

{
  default: [class SummaryReporter extends BaseReporter] {
    filename: '/Users/simen/repos/jest/packages/jest-reporters/build/SummaryReporter.js'
  }
}

And since we handle default "export" from CJS, this should work fine 👍

https://github.com/facebook/jest/blob/f0dc9932cba828a1c51ef842c00c1ca51b7f2796/packages/jest-core/src/TestScheduler.ts#L392

[thymikee]

👍🏼

[github-actions]

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