RxKotlin's ofType() name is not very easy to remember, given Kotlin has filterIsInstance() for the same. This helps alleviate the pain.

RxFilterIsInstance.kt

package me.seebrock3r.extensions.reactivex

import io.reactivex.Flowable
import io.reactivex.Observable
import io.reactivex.rxkotlin.ofType

@Deprecated(
    message = "This is just a shorthand for RxKotlin's ofType()",
    replaceWith = ReplaceWith("ofType<R>()", "io.reactivex.rxkotlin.ofType")
)
inline fun <reified R : Any> Flowable<*>.filterIsInstance(): Flowable<R> = ofType()

@Deprecated(
    message = "This is just a shorthand for RxKotlin's ofType()",
    replaceWith = ReplaceWith("ofType<R>()", "io.reactivex.rxkotlin.ofType")
)
inline fun <reified R : Any> Observable<*>.filterIsInstance(): Observable<R> = ofType()