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

apps/v4/app/(app)/(create)/components/preset-handler.tsx

@@ -0,0 +1,38 @@
+"use client"
+
+import * as React from "react"
+import { useRouter } from "next/navigation"
+import { generateRandomPreset, isPresetCode } from "shadcn/preset"
+
+import { useDesignSystemSearchParams } from "@/app/(app)/(create)/lib/search-params"
+
+export function PresetHandler() {
+  const router = useRouter()
+  const [params, setParams] = useDesignSystemSearchParams()
+  const hasConverted = React.useRef(false)
+
+  React.useEffect(() => {
+    if (params.preset === "random") {
+      router.replace(`/create?preset=${generateRandomPreset()}`)
+    }
+  }, [params.preset, router])
+
+  React.useEffect(() => {
+    if (hasConverted.current) {
+      return
+    }
+    hasConverted.current = true
+
+    if (!params.preset || params.preset === "random") {
+      return
+    }
+
+    if (isPresetCode(params.preset)) {
+      return
+    }
+
+    setParams({ base: params.base })
+  }, [params.preset, params.base, setParams])
+
+  return null
+}