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Ramanpreet Nara 3dab9a0d01 Make parser return empty schema when parsing non-spec files

Summary:
Right now, running the codegen parser on regular JavaScript files causes it to throw an error:

https://www.internalfb.com/intern/diffusion/FBS/browsefile/master/xplat/js/react-native-github/packages/react-native-codegen/src/parsers/flow/index.js?commit=1e93f27aac8890f1731650fdcc38b702ae8874e2&lines=59-63%2C106-107

This makes the parser less usable, because you can't simply loop over a list of JavaScript files, and run codegen on them. You need to do some filtering beforehand, or surround each invocation of the parser with a try/catch.

Our codegen schema supports the idea of an empty schema:

```
{
  modules: {}
}
```

To improve the parser's ergonomics, this diff migrates the codegen parser over to returning the empty schema when it cannot detect a Component or NativeModule spec inside a JavaScript file.

Changelog: [Internal]

Reviewed By: JoshuaGross

Differential Revision: D26034052

fbshipit-source-id: c2f15aba9c0e052012396eaed2034537f5918e33

2021-01-23 02:02:57 -08:00