Folder structure

src/input.js

@@ -0,0 +1,19 @@
+import {DEFAULT_KEYPRESS_DELAY} from './constants.js';
+
+const input = {};
+let lastKeypressTime = 0;
+
+document.addEventListener('keydown', (e) => {input[e.key] = true; e.preventDefault()});
+document.addEventListener('keyup', (e) => {input[e.key] = false; e.preventDefault()});
+
+export function key(key) {
+  return input[key]
+}
+
+export function afterKeyDelay(amount=DEFAULT_KEYPRESS_DELAY) {
+  const now = Date.now();
+  if (now - lastKeypressTime >= amount) {
+    lastKeypressTime = now;
+    return true;
+  }
+}