Keybinding for a sequence in your browser

sequence.js

// ```
// sequenceKeyBinding('hello', () => { console.log('world') })
// ```
const sequenceKeyBinding = (seq, action, timeoutMs=3000) => {
	let curr = 0
	let timeout = null

	document.body.addEventListener('keydown', (e) => {
	 if (seq[curr] == e.key) {
		 if (!timeout) {
			timeout = setTimeout(() => {
				curr = 0
				timeout = null
			}, timeoutMs)
		 }
		 if (++curr === seq.length) {
			clearTimeout(timeout)
			timeout = null
			action()
		 }
	 } else if (timeout) {
		 clearTimeout(timeout)
		 timeout = null
	 }
	})
}