Script that can emulate continual typing in a CM6 editor, to aid performance testing

emulate-typing-in-cm6.js

let editor = document.querySelector('.cm-content')

let timer = null

let char = 'a'
let orig = char
let copy = null

function run() {
    if (copy == null || !copy.length) {
        copy = orig.slice() + ' ' + new Date() + '\n'
    }
    char = copy[0]
    copy = copy.slice(1)

    editor.focus()
    document.execCommand('insertText', false, char)

    timer = setTimeout(run, 100 + (Math.random() < 0.1 ? 1000 : 0))
}

window._chaosMonkey = run
window._clearChaosMonkey = ()=>{
    clearTimeout(timer)
}