Support req.resolve(key)

[Hypnosphi]

See https://webpack.js.org/guides/dependency-management/#context-module-api

[techieshark]

I'm wondering what the status of this PR is?

It looks like it is a blocker for Storybook - storybookjs/storybook#7697 (comment)

There's a workaround in Storybook - updating jest.config.js like so -

transform: {
  // should be above any other js transform like babel-jest
  '^.+\\.stories\\.js$': '<rootDir>/path/to/injectFileName',
}

but it seems that workaround doesn't work for Create React App users who can't edit their jest config:

storybookjs/storybook#9946

(So I'm wondering if merging this would help with the above CRA issue.)

[luke-j]

Is this PR able to be merged?