Method check

packages/zod/src/v4/core/checks.ts:24–24

(payload: schemas.ParsePayload<T>)

  /** The set of issues this check might throw. */
  issc?: errors.$ZodIssueBase;
  check(payload: schemas.ParsePayload<T>): util.MaybeAsync<void>;
  onattach: ((schema: schemas.$ZodType) => void)[];
}