HarmonyOS TextEncoder无法使用

参考下以下用法：

import { util } from '@kit.ArkTS'
let that = new util.TextEncoder();
let buffer = new ArrayBuffer(4);
let dest = new Uint8Array(buffer);
let result = new Object();
result = that.encodeIntoUint8Array('abcd', dest);
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参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-util-V5#textencoder