Delete Message Automation on Google Messenger

deleter.js

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}
async function demo() {
    console.log('Taking a break...');
    while(true) {
        items = document.getElementsByClassName('menu-icon');
        if(items.length<5){
document.getElementsByClassName("load-more mat-button mat-button-base").item(0).click();
        }
        items = document.getElementsByClassName('menu-icon');
await sleep(1500);
        items.item(0).click();
        await sleep(500);
        var buttons = document.getElementsByClassName('mat-menu-item');
        await sleep(500);
        for (let button of buttons){
        if(button.innerText === 'Delete')
            button.click();
        }
        await sleep(500);
        document.getElementsByClassName('action-button confirm mat-button mat-button-base ng-star-inserted').item(0).click();
    }
}