Restore vanilla components

app/javascript/mastodon/is_mobile.js

@@ -0,0 +1,27 @@
+import detectPassiveEvents from 'detect-passive-events';
+
+const LAYOUT_BREAKPOINT = 630;
+
+export function isMobile(width) {
+  return width <= LAYOUT_BREAKPOINT;
+};
+
+const iOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
+
+let userTouching = false;
+let listenerOptions = detectPassiveEvents.hasSupport ? { passive: true } : false;
+
+function touchListener() {
+  userTouching = true;
+  window.removeEventListener('touchstart', touchListener, listenerOptions);
+}
+
+window.addEventListener('touchstart', touchListener, listenerOptions);
+
+export function isUserTouching() {
+  return userTouching;
+}
+
+export function isIOS() {
+  return iOS;
+};