Method freeze

packages/zod/src/v3/types.ts:4879–4884

(data: ParseReturnType<this["_output"]>)

  _parse(input: ParseInput): ParseReturnType<this["_output"]> {
    const result = this._def.innerType._parse(input);
    const freeze = (data: ParseReturnType<this["_output"]>) => {
      if (isValid(data)) {
        data.value = Object.freeze(data.value);
      }
      return data;
    };
    return isAsync(result) ? result.then((data) => freeze(data)) : freeze(result);
  }