[TheSanches]

Как переписать отправку формы написанную на jQuery, используя fetch

function messagesFromBase() {

        var subjectId = 2;
        var lastName = 'text';
        var firstName = 'text';
        var thirdName = 'text';
        var companyName = 'text';
        var response = {};
        $.ajax({
            async: false,
            type: "POST",
            dataType: 'json',
            charset: 'windows-1251',
            url: "url-base",
            data: {
                subjectId: subjectId,
                lastName: lastName,
                firstName: firstName,
                thirdName: thirdName,
                companyName: companyName
            },
            success: function (resp) {
                response = resp;
            },
            error: function (jqXHR, status, e) {
                response = false;
            },
        });
        return response;
    }