Class Stream<T>

new Stream<T>(iterable: Iterable<T>): Stream<T>

"[custom]"(): string

"[iterator]"(): Iterator<T>

at(index: number): undefined | T

concat(stream: Stream<T>): Stream<T>

filter(predicate: (item: T) => boolean): Stream<T>

map<R>(mapper: (item: T) => R): Stream<R>

reduce<R>(
    reducer: (accumulator: R, item: T) => R,
    initialValue: R,
): ReducedStream<T, R>

slice(start: number, end: number): Stream<T>

toArray(): T[]

from<T>(stream: Stream<T>): Stream<T>