Add support for custom dependency extractors

[rubennorte]

Summary

Adds a new dependencyExtractor option to use a custom function to extract dependencies from the code. It will allow users to implement support for custom functions loading modules (which will be taken into account to determine which tests to run):

package.json:

{
  ...
  "jest": {
    "dependencyExtractor": "<rootDir>/dependencyExtractor.js"
  }
}

dependencyExtractor:

const blockCommentRe = /\/\*[^]*?\*\//g;
const lineCommentRe = /\/\/.*/g;
const LOAD_MODULE_RE = /(?:^|[^.]\\s*)(\\bloadModule\\s*?\\(\\s*?)([\`'"])([^\`'"]+)(\\2\\s*?\\))/g;

module.exports = function dependencyExtractor(code, defaultExtractor) {
  const dependencies = defaultExtractor(code);
  const addDependency = (match, pre, quot, dep, post) => {
    dependencies.add(dep);
    return match;
  };

  code
    .replace(blockCommentRe, '')
    .replace(lineCommentRe, '')
    .replace(LOAD_MODULE_RE, addDependency);

  return dependencies;
};

sample-test.js:

const module = loadModule('./foo');

it('should reload when `foo` changes!', () => {
  // ...
});

Test plan

Updated unit tests for the jest-haste-map and added an E2E test for this feature.

[codecov-io]

Codecov Report

Merging #7313 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #7313      +/-   ##
==========================================
- Coverage   66.64%   66.63%   -0.02%     
==========================================
  Files         241      241              
  Lines        9337     9334       -3     
  Branches        5        6       +1     
==========================================
- Hits         6223     6220       -3     
  Misses       3111     3111              
  Partials        3        3

Impacted Files	Coverage Δ
packages/jest-config/src/ValidConfig.js	100% <ø> (ø)	⬆️
packages/jest-config/src/index.js	19.35% <ø> (ø)	⬆️
packages/jest-runtime/src/index.js	76.99% <ø> (ø)	⬆️
packages/jest-haste-map/src/index.js	92.05% <ø> (ø)	⬆️
packages/jest-config/src/normalize.js	85.53% <ø> (ø)	⬆️
packages/jest-config/src/Defaults.js	100% <ø> (ø)	⬆️
packages/jest-haste-map/src/worker.js	94.44% <100%> (+0.15%)	⬆️
packages/jest-haste-map/src/lib/extractRequires.js	100% <100%> (ø)	⬆️
packages/jest-mock/src/index.js	85.41% <0%> (-0.14%)	⬇️
packages/expect/src/spyMatchers.js	97.43% <0%> (-0.02%)	⬇️

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[SimenB]

Oh, awesome! I actually started a branch with this stuff months ago, but never was able to finish it

[thymikee]

Nice, integrating non-js runners is gonna be way better now.

[github-actions]

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