Function callback

packages/effect/src/internal/effect.ts:1162–1168

(
  register: (
    this: Scheduler.Scheduler,
    resume: (effect: Effect.Effect<A, E, R>) => void,
    signal: AbortSignal
  ) => void | Effect.Effect<void, never, R>
)

/** @internal */
export const callback = <A, E = never, R = never>(
  register: (
    this: Scheduler.Scheduler,
    resume: (effect: Effect.Effect<A, E, R>) => void,
    signal: AbortSignal
  ) => void | Effect.Effect<void, never, R>
): Effect.Effect<A, E, R> => callbackOptions(register as any, register.length >= 2)

/** @internal */
export const never: Effect.Effect<never> = callback<never>(constVoid)