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src/components/ai-elements/shimmer.tsx

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+"use client";
+
+import { cn } from "@/lib/utils";
+import { motion } from "motion/react";
+import {
+  type CSSProperties,
+  type ElementType,
+  type JSX,
+  memo,
+  useMemo,
+} from "react";
+
+export type TextShimmerProps = {
+  children: string;
+  as?: ElementType;
+  className?: string;
+  duration?: number;
+  spread?: number;
+};
+
+const ShimmerComponent = ({
+  children,
+  as: Component = "p",
+  className,
+  duration = 2,
+  spread = 2,
+}: TextShimmerProps) => {
+  const MotionComponent = motion.create(
+    Component as keyof JSX.IntrinsicElements
+  );
+
+  const dynamicSpread = useMemo(
+    () => (children?.length ?? 0) * spread,
+    [children, spread]
+  );
+
+  return (
+    <MotionComponent
+      animate={{ backgroundPosition: "0% center" }}
+      className={cn(
+        "relative inline-block bg-[length:250%_100%,auto] bg-clip-text text-transparent",
+        "[--bg:linear-gradient(90deg,#0000_calc(50%-var(--spread)),var(--color-background),#0000_calc(50%+var(--spread)))] [background-repeat:no-repeat,padding-box]",
+        className
+      )}
+      initial={{ backgroundPosition: "100% center" }}
+      style={
+        {
+          "--spread": `${dynamicSpread}px`,
+          backgroundImage:
+            "var(--bg), linear-gradient(var(--color-muted-foreground), var(--color-muted-foreground))",
+        } as CSSProperties
+      }
+      transition={{
+        repeat: Number.POSITIVE_INFINITY,
+        duration,
+        ease: "linear",
+      }}
+    >
+      {children}
+    </MotionComponent>
+  );
+};
+
+export const Shimmer = memo(ShimmerComponent);