val flow = myFlow()
flow.collect {
  if (it is Success) {
    // I found the value I was waiting for,
    // stop collecting values and go back to executing the function
  }
}

flow.transformWhile { it ->
    emit(it)
    return it !is Success
}.collect { ... }

Success

collect

takeWhile { it !is Success }

return@transformWhile

first

any