How to use the jose.JWS.sign function in jose

Object.assign(payload, {
      aud: options.audience !== undefined ? options.audience : payload.aud,
      azp: options.authorizedParty !== undefined ? options.authorizedParty : payload.azp,
      exp: options.expiresIn !== undefined ? timestamp + options.expiresIn : payload.exp,
      iat: payload.iat !== undefined ? payload.iat : iat,
      iss: options.issuer !== undefined ? options.issuer : payload.iss,
      sub: options.subject !== undefined ? options.subject : payload.sub,
    });

    if (alg === 'none') {
      return [base64url.encode(JSON.stringify(header)), base64url.encode(JSON.stringify(payload)), ''].join('.');
    }

    header.kid = key.kty !== 'oct' ? key.kid : undefined;
    return JWS.sign(payload, key, header);
  }