How to use the @aws-sdk/hash-node.Hash function in @aws-sdk/hash-node

constructor() {
    if (supportsCryptoModule()) {
      this.hash = new NodeHash("md5");
    } else {
      this.hash = new BrowserMd5();
    }
  }

constructor(secret?: SourceData) {
        if (supportsCryptoModule()) {
            this.hash = new NodeHash('sha256', secret);
        } else {
            this.hash = new BrowserSha256(secret);
        }
    }