Function fib

packages/effect/test/Stream/sequencing.test.ts:69–80

(n: number)

  it.effect("flatMap - deep flatMap stack safety", () =>
    Effect.gen(function*() {
      const fib = (n: number): Stream.Stream<number> =>
        n <= 1 ?
          Stream.succeed(n) :
          pipe(
            fib(n - 1),
            Stream.flatMap((a) =>
              pipe(
                fib(n - 2),
                Stream.flatMap((b) => Stream.succeed(a + b))
              )
            )
          )
      const result = yield* (Stream.runCollect(fib(10)))
      deepStrictEqual(Array.from(result), [55])
    }))