How to use the @ethersproject/bytes.joinSignature function in @ethersproject/bytes

signMessage(message: Bytes | string): Promise {
        return Promise.resolve(joinSignature(this._signingKey().signDigest(hashMessage(message))));
    }

Wallet.prototype.signMessage = function (message) {
        return Promise.resolve(bytes_1.joinSignature(this._signingKey().signDigest(hash_1.hashMessage(message))));
    };
    Wallet.prototype.encrypt = function (password, options, progressCallback) {

signMessage(message) {
        return Promise.resolve(joinSignature(this._signingKey().signDigest(hashMessage(message))));
    }
    encrypt(password, options, progressCallback) {