Hi. The definition of Promise<T> in the Kot...

# javascript

[natpryce]

Hi. The definition of Promise<T> in the Kotlin JS runtime library is incorrect — it doesn’t handle the case when a function passed to then returns a “thenable” result (usually another Promise). I’ve implemented a version that does: https://try.kotlinlang.org/#/UserProjects/hi5gtn3e98h5ivrpve1b193j80/e7m31fl1smt0r00jd1ii7pe9nv

[bashor]

I think it can be done in more typesafe way, look my version alongside your
https://try.kotlinlang.org/#/UserProjects/om0j50odh7l7qmt1lnnvqrvqqi/na4e9uj4ko13o07702f460cp6s

[natpryce]

That is better. I didn’t expect the static overloads to work, but it looks like they do

[natpryce]

I made the unsafe version of then in my implementation internal so it couldn’t leak out to client code

[natpryce]

but type safe all the way is better

[natpryce]

I’ve raised an issue in YouTrack to track this bug https://youtrack.jetbrains.com/issue/KT-19672

[bashor]

👍