Several concerns

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Thank you very much, but I have this error:

I may have forgotten something in your explanations but in any case thank you for your help.
UserError: An error occurred in one of datasetReady callbacks Caused by ReferenceError: xxxxx is not defined

And I have an error on line 8 and 14 at the :

‘await’ has no effect on the type of this expression.

And I also have the XXX which I don’t see what it is for.

And I have the get_DataPraticien function which is transparent.

Here is the complete new code:

import wixData from 'wix-data';

$w.onReady(()=> {
    $w('#dataPraticien').onReady(()=>{

        $w("#dropdownreg").onChange(async()=>{
            let dropdownregValue = $w("#dropdownreg").value;
            let resultReg = await search(dropdownregValue);
            console.log(resultReg);
        });

        $w("#dropdowndep").onChange(async()=>{
            let dropdowndepValue = $w("#dropdowndep").value;
            let resultDep = await search(dropdowndepValue);
            console.log(resultDep);
        });
        xxxxx(); 
    });
});

 function get_DataPraticien() {
     wixData.query("#dataPraticien")
         .limit(1000)
         .find()
         .then(results => {
             const uniqueTitles = getUniqueTitles(results.items);
             $w("#dropdownreg").options = buildOptions(uniqueTitles);
         });

     function getUniqueTitles(items) {
         const titlesOnly = items.map(item => item.region);
         return [...new Set(titlesOnly)];
     }

     function buildOptions(uniqueList) {
         return uniqueList.map(curr => {
             return { label: curr, value: curr };
         });
     }
 }

 export function dropdownreg_change(event, $w) {
     dropdowndep();
     $w("#dropdowndep").enable();
     locationCityFilter();

 }

 function locationCityFilter() {
     $w("#dataPraticien").setFilter(wixData.filter()
         .eq("region", $w("#dropdownreg").value)

     );

 }

 function dropdowndep() {
     wixData.query("Listepraticiens")
         .contains("departement", $w("#dropdownreg").value)
         .limit(1000)
         .find()
         .then(results => {
             const uniqueTitles = getUniqueTitles(results.items);
             $w("#dropdowndep").options = buildOptions(uniqueTitles);

         });

     function getUniqueTitles(items) {
         const titlesOnly = items.map(item => item.departement);
         return [...new Set(titlesOnly)];
     }

     function buildOptions(uniqueList) {
         return uniqueList.map(curr => {
             return { label: curr, value: curr };

         });
     }
 }

 function search() {
     $w("#dataPraticien").onReady(function () {
         $w("#dataPraticien").setFilter(wixData.filter().contains('departement', String($w('#dropdowndep').value))
                 .and(wixData.filter().contains("region", String($w('#dropdownreg').value))))

             .then(count)

     });

     //CLEAR FILTER 🚀
     $w("#button31").onClick(function () {
         $w("#dropdowndep").value = undefined;
         $w("#dropdownreg").value = undefined;

         $w("#dataPraticien").setFilter(wixData.filter());
         $w('#nbrpraticiens').hide();

     });
     //COUNT FUNCTION👍
     function count() {
         let total = $w('#dataPraticien').getTotalCount();
         if (total > 1) {
             $w('#nbrpraticiens').text = `${total} praticiens trouvés`;
             $w('#nbrpraticiens').show();
         }
         if (total === 1) {
             $w('#nbrpraticiens').text = `${total} praticien trouvé`;
             $w('#nbrpraticiens').show();
         }
         if (total === 0) {
             $w('#nbrpraticiens').text = "Nous n'avons pas encore de praticien dans ce secteur";
             $w('#nbrpraticiens').show();
         }

         //SCROLL TO THE TOP WHEN PAGINATION IS CHANGED ⚡

         $w("#pagination1").onChange(() => {

             $w("#haut").scrollTo();
         });
     }
 }

I may have forgotten something in your explanations but in any case thank you for your help.