ran npm run tdd & generated TDD

test/onUserInputChange/onUserInputChange.js

@@ -0,0 +1,14 @@
+module.exports = 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);
+});
+};