return an empty array from backend

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Big thanks for the advise @yisrael-wix . I transformed all the promise call as suggested. It seems to work well in the backend. All object in return has data.

But I always receive undefined while calling it from the frontend. So I converted the frontend call in the backend to see the result. I am receiving a message from the Wix editor that the function is a type void. Here the message received from the converted backend function:

See the getTarifReserv function. Is it right to say this is because of the void function I am receiving an undefined

export function getTarifReserv(user) {
       return wixData.query("myParams")
        .eq("title", "Reservation")
        .eq("userId", user._id)
        .find()
        .then((results) => {
            let rowParam = results.items[0];
            if (rowParam !== null && rowParam !== undefined) {
                return {
                    "total": rowParam.cout,
                    "period": rowParam.period
                };
           } else {
                let err = "getTarifReserv: 2 ERREUR Logique, pas de record MyParams pour Reservation pour userID = " + user._id;
                console.error(err);
                return {
                    "total": 0,
                    "period": []
                };
            }
        })
        .catch((err) => {
            console.error(err);
        })
}

Can you help for that part too. to resolve the undefined problem. Here is the front end function:

export function calculTarif(selChalet, selFrom, selTo, selMbr, selGroup, selFamille, member) {
    let dollar = 0;
    return estimeTarif(selChalet, selFrom, selTo, selMbr, selGroup, selFamille, member)
        .then((tarif) => {
            let total = 0;
            return tarif;
        })
        .then(tarif => {
            //let calcDollar = 
            return getTarifReserv(member)
                .then(response => {
                    dollar = selTarif = cout = response.cout;
                    periodTarif = response.period;

                    if (dollar === 0) {
                        $w('#tarif').text = $w('#adminTarif').text = "?";
                    } else {
                        let tmp = cout.toLocaleString();
                        $w('#adminTarif').text = $w('#tarif').text = tmp;
                    }
                    return response;
                })
        })
        .catch((err) => {
            console.error(err);
        });
}