Requiring coffee files without an extension is broken

[AsaAyers]

When using CoffeeScript in Node or Browserify you can use require './somefile' and it will check for somefile.coffee, somefile.litcoffee, and somefile.coffee.md. Jest does not look for these extensions and simply throws a Cannot find module error.

To reproduce this:

1. create examples/coffeescript/common.coffee. It can be an empty file, it just should exist.
2. replace sum.coffee with the code below.
3. coffee sum.coffee and see that you get get the output 11
4. run npm test. It will throw the Cannot find module error.

examples/coffeescript/sum.coffee

# It doesn't matter what this module does, it just matters that the extension
# isn't specified. This will work in NodeJS and Browserify
require './common'

sum = (a, b) ->
  a + b

module.exports = sum

# I just added this so you can run `coffee sum.coffee`
# to demonstrate that this is working outside of jest.
if require.main is module
    console.log sum(5, 6)

[sophiebits]

Yeah, perhaps we should support a moduleFileExtensions or something of that sort.

[AsaAyers]

I have a pull request I'm putting together. I think it should use require.extensions because that is the list of what Node would use with the native require.

[jeffchan]

@AsaAyers any updates? I would like to see this too

[AsaAyers]

I don't know why it says "Closed with unmerged commits" but my PR was #45.

At vjeux's suggestion it looks like I documented it:
https://github.com/facebook/jest/blob/master/docs/API.md#configmodulefileextensions-array

[github-actions]

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