snapshot of https://github.com/shadcn-ui/ui.git (main, 2026-09-15; blobs > 131072B omitted)

apps/v4/registry/bases/base/hooks/_registry.ts

@@ -0,0 +1,14 @@
+import { type Registry } from "shadcn/schema"
+
+export const hooks: Registry["items"] = [
+  {
+    name: "use-mobile",
+    type: "registry:hook",
+    files: [
+      {
+        path: "hooks/use-mobile.ts",
+        type: "registry:hook",
+      },
+    ],
+  },
+]

apps/v4/registry/bases/base/hooks/use-mobile.ts

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+import * as React from "react"
+
+const MOBILE_BREAKPOINT = 768
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined)
+
+  React.useEffect(() => {
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`)
+    const onChange = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    }
+    mql.addEventListener("change", onChange)
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    return () => mql.removeEventListener("change", onChange)
+  }, [])
+
+  return !!isMobile
+}