Importing and Exporting Collection Data with Code

https://support.wix.com/en/article/corvid-tutorial-importing-and-exporting-collection-data-with-code

Made by example, but does not work. What have I omitted?

import wixData from 'wix-data';

export function importButton_click(event) {
const items = JSON.parse($w("#textBox").value);
 const collection = $w("#collectionInput").value;
 
  items.forEach( (item) => {
    wixData.insert(collection, item)
      .then( (results) => {
        console.log(`Added item: ${JSON.stringify(results)}`);
      } )
      .catch( (err) => {
        console.log(err);
      } );
  } );
 
  $w("#textBox").value = "";
  }

export function exportButton_click(event) {
 let collection = $w("#collectionInput").value;
 
  wixData.query(collection)
    .find()
    .then( (results) => {
      $w("#textBox").value = JSON.stringify(results.items);
    } )
    .catch( (err) => {
      console.log(err);
    } );
}

export function exportButton_onClick(event) {
 let collection = $w("#collectionInput").value;
 
  wixData.query(collection)
    .limit(1000)
    .find()
    .then( (results) => {
      $w("#textBox").value = JSON.stringify(results.items);
    } )
    .catch( (err) => {
      console.log(err);
    } );
}

Does anyone know how to do this?