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then

Platform and version requirements: 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