Text Shimmer

"use client";
import React, { useMemo, type JSX } from "react";
import { motion } from "motion/react";
import { cn } from "@/lib/utils";
 
export type TextShimmerProps = {
    children: string;
    as?: React.ElementType;
    className?: string;
    duration?: number;
    spread?: number;
};
 
export function TextShimmer({
    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]",
                "[--bg:linear-gradient(90deg,#0000_calc(50%-var(--spread)),var(--base-gradient-color),#0000_calc(50%+var(--spread)))] [background-repeat:no-repeat,padding-box]",
                "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: Infinity,
                duration,
                ease: "linear",
            }}
            style={
                {
                    "--spread": `${dynamicSpread}px`,
                    backgroundImage: `var(--bg), linear-gradient(var(--base-color), var(--base-color))`,
                } as React.CSSProperties
            }
        >
            {children}
        </MotionComponent>
    );
}