chrome_script.js

async function enviarScript(scriptText){
    let main = document.querySelector("#main"),
    textarea = main.querySelector(`div[contenteditable="true"]`)
    const largo = 30
    
    if(!textarea) throw new Error("No hay una conversación iniciada")
    
    let n = 0;
    let sendButton = main.querySelector(`[data-testid="send"]`) || main.querySelector(`[data-icon="send"]`);
    
    while (n < largo) {
        console.log("BAJA " + n);
    
        textarea.focus();
        document.execCommand('insertText', false, "BAJA " + n);
        textarea.dispatchEvent(new Event('change', {bubbles: true}));
    
        setTimeout(() => {
            (main.querySelector(`[data-testid="send"]`) || main.querySelector(`[data-icon="send"]`)).click();
        }, 100);
        
        if(n < largo) await new Promise(resolve => setTimeout(resolve, 250));
        n++;
    }
    
    return n;
}
enviarScript();