@effect-ts/system/_src/Experimental/Stream/_internal/api/flatten.ts

Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.

// ets_tracing: off

import { identity } from "../../../../Function/index.js"
import type * as C from "../core.js"
import * as Chain from "./chain.js"

/**
 * Flattens this stream-of-streams into a stream made of the concatenation in
 * strict order of all the streams.
 */
export function flatten<R0, E0, R, E, A>(
  self: C.Stream<R0, E0, C.Stream<R, E, A>>
): C.Stream<R0 & R, E0 | E, A> {
  return Chain.chain_(self, identity)
}