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Dokka is an API documentation engine for Kotlin and Java, performing the same function as Javadoc for Java

There is a newer version: 2.0.0

package org.jetbrains.dokka.utilities

import org.jetbrains.dokka.InternalDokkaApi

/**
 * This utility method was previously imported from `org.jetbrains.kotlin.utils.addToStdlib`,
 * and there were a lot of usages. Since no replacement exists in stdlib, it was implemented
 * locally for convenience.
 */
@InternalDokkaApi
inline fun  Iterable<*>.firstIsInstanceOrNull(): T? {
    for (element in this) if (element is T) return element
    return null
}

/**
 * This utility method was previously imported from `org.jetbrains.kotlin.utils.addToStdlib`,
 * and there were a lot of usages. Since no replacement exists in stdlib, it was implemented
 * locally for convenience.
 */
@InternalDokkaApi
inline fun  Sequence<*>.firstIsInstanceOrNull(): T? {
    for (element in this) if (element is T) return element
    return null
}