are there any plans to improve the “Find Usages” i...

# intellij

[zak.taccardi]

are there any plans to improve the “Find Usages” in IntelliJ/Android Studio for a typealias? For example, typealias LoadString: () -> String finds all usages of () -> T and I specifically just want LoadString

[Mike]

Given that a typealias is just a convenience/alias, IJ/AS are strictly doing the right thing as anywhere LoadString is used, a () -> String can be used.

So, I think you're stuck with text search, or filtering what IntelliJ returns.

[zak.taccardi]

I’m aware why this is an issue, but until it’s fixed, using functional types to avoid extra class definitions make code discovery and reading more difficult

[Mike]

I believe there's a keep for providing Higher-kinded types. Inline classes are also attempting to address this, but not helpful for your scenario.

So yes, there are still gaping holes in writing FP code in Kotlin...

[Alexey Belkov [JB]]

Failed to reproduce for code:

typealias LoadString = () -> String

fun foo(l: LoadString) {}
fun <T> bar(l: () -> T) {}

Can you please create an issue at http://kotl.in/issue with a self-contained code sample to reproduce?

[zak.taccardi]

@Alexey Belkov [JB] - find usages works, but it does not treat the following as different types:

typealias LoadFavoriteColor = () -> String
typealias LoadFavoriteName = () -> String

[zak.taccardi]

which creates a pain point for those looking to replace SAM interfaces with with functional types

[zak.taccardi]

With the cursor on LoadFavoriteColor on mac, cmd + option + B should navigate to an implementation of LoadFavoriteColor

[zak.taccardi]

overall what I’m asking for is a developer experience for functional type aliases that’s on par with with SAM interfaces

[Alexey Belkov [JB]]

1. Sorry, I don't understand your comment "find usages works, but it does not treat the following as different types". Can you please share a code sample with detailed steps to reproduce?

2. So, do you propose that "Go to implementations" should work here for LoadString? Or do you have some different case in mind?

typealias LoadString = () -> String

class Foo : LoadString {
    override fun invoke(): String = TODO()
}