Add the ability to set the default apiCheckInstance for all types

[kentcdodds]

Something like formlyConfig.extras.defaultTypeApiCheckInstance. So I don't have to specify apiCheckInstance on all of my types and wrappers.

[kentcdodds]

As before this one is for first-timers-only. That means that I will only accept a PR for this one from someone who's never contributed to open source before. This one is particularly easy (but don't make that statement make you feel bad if you have a hard time with it, there's more to contributing to open source than changing lines of code, especially if it's your first time). I'll hold your hand through this if you need me to. :-) Here are the steps to get a PR merged here.

• Watch this video to learn what you need to do to get things setup
• Go to this test and change describe.skip to describe.only
• Run $ npm test
• Notice that it's failing
• Go to this line. This is where formly decides which instance of apiCheck to use to issue the warning. We need to tell formly to default to the field's instance (the one that's passed in and is called apiCheckInstance), then the formlyConfig.extras.apiCheckInstance, then the formlyApiCheck instance. Right now it's missing the formlyConfig.extras.apiCheckInstance. I would just add it as another || between the first and second one on the same line.
• Update the eslint comment here to allow for a complexity of 9 (instead of 8) because you're adding another branch of complexity. Don't worry, it's covered, and I think that the code is fairly easy to understand. If you want, you could refactor it to make it even better.
• Once the test is passing, change the describe.only to describe so all the tests run.
• Make sure that all the tests pass
• Commit your changes to the src/ directory mentioning issue Add a hook to transform field config before forms are compiled #343 (note it may take a second... it runs all the tests...)
• Push your changes to your fork, create a PR, get merged, celebrate 🎉

I'm happy to hold your hand through this if you need help. Catch me on gitter.

[kentcdodds]

Thanks @bmacheski!

[kentcdodds]

This has been released in angular-formly@6.23.0 :-)