then

Требования к платформе и версии: JS (1.1)

open fun <S> then(onFulfilled: ((T) -> S)?): Promise<S>

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

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/-promise/then.html