then

Требования к платформе и версии: JS (1.1)

inline fun <T, S> Promise<Promise<T>>.then(
    noinline onFulfilled: ((T) -> S)?
): Promise<S>

inline fun <T, S> Promise<Promise<T>>.then(
    noinline onFulfilled: ((T) -> S)?, 
    noinline onRejected: ((Throwable) -> S)?
): Promise<S>

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/then.html