trigger-js-input-change.js

// INPUT
let text = '---';
let input = document.querySelector('input');
let event = new Event('input', { bubbles: true });
let nativeInputValueSetter = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value').set;

nativeInputValueSetter.call(input, text);
input.dispatchEvent(event);



// TEXTAREA
let text = '---\n1\n2';
let textarea = document.querySelector('textarea');
let event = new Event('input', { bubbles: true });
let nativeInputValueSetter = Object.getOwnPropertyDescriptor(HTMLTextAreaElement.prototype, 'value').set;

nativeInputValueSetter.call(textarea, text);
textarea.dispatchEvent(event);