在返回Promise的同时,从Firebase Cloud函数返回布尔值的正确方法是什么?

因此,Firebase Cloud函数最终都必须返回承诺。如果我们处理的是一个可调用函数,而客户端希望从该函数中获得一个布尔值,我们是简单地返回一个用该布尔值解析的promise,还是只返回该布尔值?

exports.doesUserExistAtPhoneNumber = onCall(async (request) => {
    const phoneNumber = request.data.phoneNumber;

    try {
        const db = getFirestore();
        const snapshot = await db.collection("userAccounts").where("phoneNumber", "==", phoneNumber).get();

        if (snapshot.empty) {
            // There is NO EXISTING user at this phone number.
            return Promise.resolve(false);
        } else {
            // There is INDEED AN EXISTING user at this phone number.
            return Promise.resolve(true);
        }
    } catch (error) {
        throw new HttpsError("unknown", error);
    }
});