One more for the day. Youtrack: <https://youtrack...

# javascript

[andylamax]

One more for the day.

Youtrack: https://youtrack.jetbrains.com/issue/KT-45727

Prelude
Normally we'd like to have interfaces or abstract classes as our public API, and have underlying implementations private/internal to the module.

Problem
With kotlin multiplatform and kotlin js, this is still a huge challenge because despite using @JsExport, properties of interfaces/abstract classes, are still mangled. It should be known that methods
are not mangled at all

Reproducer
Reproducer can be found at ManglingImplementationTest

[andylamax]

Elaboration

Consider the following block of code
kt

@JsExport
interface State<out T> {
    val value: T
}

@JsExport
interface MutableState<T> : State<T> {
    override var value: T
}

class MutableStateImpl<T>(override var value: T) : MutableState<T>

would cause this test to fail
kt

val state: State<Int> = MutableStateImpl(0)
window.asDynamic().state = state
assertEquals(0, window.asDynamic().state.value) // expected: 0, actual: undefined

Expected Behaviour
This test should pass since State was marked with @JsExport, therefore, MutableStateImpl should respect, State's export as it implements it
kt

val state: State<Int> = MutableStateImpl(0)
window.asDynamic().state = state
assertEquals(0, window.asDynamic().state.value) // expected: 0, actual: undefined

[andylamax]

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