Function fnUntraced

packages/effect/src/internal/effect.ts:1198–1214

(
  body: Function,
  ...pipeables: Array<any>
)

/** @internal */
export const fnUntraced: Effect.fn.Untraced = (
  body: Function,
  ...pipeables: Array<any>
) => {
  const fn = pipeables.length === 0
    ? function(this: any) {
      return suspend(() => fromIteratorUnsafe(body.apply(this, arguments)))
    }
    : function(this: any) {
      let effect = suspend(() => fromIteratorUnsafe(body.apply(this, arguments)))
      for (let i = 0; i < pipeables.length; i++) {
        effect = pipeables[i](effect, ...arguments)
      }
      return effect
    }
  return defineFunctionLength(body.length, fn)
}

const defineFunctionLength = <F extends Function>(length: number, fn: F): F =>
  Object.defineProperty(fn, "length", {