Ability to extend Theme TS type.

[Trancever]

Describe the feature

useTheme hook should return the correct type that contains user-defined properties.

Motivation

The type returned by useTheme hook is not customizable in any way right now. It always returns a type containing only properties defined by the library. It would be handy if user-defined properties are also properly typed.

@satya164 Would you like to explain how this could be implemented? Or at least post some link where we could see how it is done in other libs?

[peleteiro]

If it was an interface instead of Type we could use module augmentation to do so.

[satya164]

@Trancever I think we can do following:

declare global {
  namespace ReactNativePaper {
    interface Theme {
      // Our theme properties here
    }
  }
}

Then users will be able to do the same to add any new properties.

[github-actions]

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[Trancever]

This is fixed in 4.0.0