Test migration to jest by hand

Apparently using regular expressions is way easier.

test/onUserInputChange/onUserInputChange.js

@@ -0,0 +1,15 @@
+const onUserInputChange = callback => {
+let type = 'mouse',
+lastTime = 0;
+const mousemoveHandler = () => {
+const now = performance.now();
+if (now - lastTime < 20)
+(type = 'mouse'), callback(type), document.removeEventListener('mousemove', mousemoveHandler);
+lastTime = now;
+};
+document.addEventListener('touchstart', () => {
+if (type === 'touch') return;
+(type = 'touch'), callback(type), document.addEventListener('mousemove', mousemoveHandler);
+
+};
+module.exports = onUserInputChange;