[Mascara telefone]

maskphone.js

function maskPhone(phone) {
        phone = numberOnly(phone);
        if (phone.length < 10 || phone.length > 11) {
            return phone;
        }
        const currentText = String(phone);
        let isMobile;
        isMobile = currentText.length === 11;

        let adjustedText;
        if (!isMobile) {
            const part0 = currentText.slice(0, 2);
            const part1 = currentText.slice(2, 6);
            const part2 = currentText.slice(6, 10);
            adjustedText = `(${part0}) ${part1}-${part2}`
        } else {
            const part0 = currentText.slice(0, 2);
            const part1 = currentText.slice(2, 3);
            const part2 = currentText.slice(3, 7);
            const part3 = currentText.slice(7, 11);
            adjustedText = `(${part0}) ${part1} ${part2}-${part3}`
        }
        return String(adjustedText);
    }

    function numberOnly(str) {
        str = str.toString();
        return str.replace(/\D/g, '');
    }