Allow for glob for aliases

[sheerun]

Use case: mocking css modules.

{
  "alias": {
    "**/*.scss": "identity-obj-proxy"
  }
}

[sheerun]

Even better: regexp like "/\.(scss|css|less)$/"

See moduleNameMapper from Jest

[tleunen]

Very interesting! I really like the idea of having regex support.
Want to add the feature? :)