Function permutation

packages/effect/test/STM.test.ts:143–154

(ref1: TRef.TRef<number>, ref2: TRef.TRef<number>)

  )

const permutation = (ref1: TRef.TRef<number>, ref2: TRef.TRef<number>): STM.STM<void> =>
  pipe(
    STM.all([TRef.get(ref1), TRef.get(ref2)]),
    STM.flatMap(([a, b]) =>
      pipe(
        ref1,
        TRef.set(b),
        STM.tap(() => pipe(ref2, TRef.set(a))),
        STM.asVoid
      )
    )
  )

describe("STM", () => {
  it.effect("catchAll", () =>