Function isAsync

packages/zod/src/v3/helpers/parseUtil.ts:175–176

(x: ParseReturnType<T>)

export const isDirty = <T>(x: ParseReturnType<T>): x is OK<T> | DIRTY<T> => (x as any).status === "dirty";
export const isValid = <T>(x: ParseReturnType<T>): x is OK<T> => (x as any).status === "valid";
export const isAsync = <T>(x: ParseReturnType<T>): x is AsyncParseReturnType<T> =>
  typeof Promise !== "undefined" && x instanceof Promise;