supermemory/apps/web/components/text-shimmer.tsx

"use client";
import { cn } from "@lib/utils";
import { motion } from "motion/react";
import React, { type JSX, useMemo } from "react";

export type TextShimmerProps = {
	children: string;
	as?: React.ElementType;
	className?: string;
	duration?: number;
	spread?: number;
};

function TextShimmerComponent({
	children,
	as: Component = "p",
	className,
	duration = 2,
	spread = 2,
}: TextShimmerProps) {
	const MotionComponent = motion.create(
		Component as keyof JSX.IntrinsicElements,
	);

	const dynamicSpread = useMemo(() => {
		return children.length * spread;
	}, [children, spread]);

	return (
		<MotionComponent
			className={cn(
				"relative inline-block bg-[length:250%_100%,auto] bg-clip-text",
				"text-transparent [--base-color:#a1a1aa] [--base-gradient-color:#000]",
				"[background-repeat:no-repeat,padding-box] [--bg:linear-gradient(90deg,#0000_calc(50%-var(--spread)),var(--base-gradient-color),#0000_calc(50%+var(--spread)))]",
				"dark:[--base-color:#71717a] dark:[--base-gradient-color:#ffffff] dark:[--bg:linear-gradient(90deg,#0000_calc(50%-var(--spread)),var(--base-gradient-color),#0000_calc(50%+var(--spread)))]",
				className,
			)}
			initial={{ backgroundPosition: "100% center" }}
			animate={{ backgroundPosition: "0% center" }}
			transition={{
				repeat: Number.POSITIVE_INFINITY,
				duration,
				ease: "linear",
			}}
			style={
				{
					"--spread": `${dynamicSpread}px`,
					backgroundImage: `var(--bg), linear-gradient(var(--base-color), var(--base-color))`,
				} as React.CSSProperties
			}
		>
			{children}
		</MotionComponent>
	);
}

export const TextShimmer = React.memo(TextShimmerComponent);