text-shimmer

1'use client';
2import React, { useMemo, type JSX } from 'react';
3import { motion } from 'motion/react';
4import { cn } from '@/lib/utils';
5
6export type TextShimmerProps = {
7  children: string;
8  as?: React.ElementType;
9  className?: string;
10  duration?: number;
11  spread?: number;
12};
13
14export function TextShimmer({
15  children,
16  as: Component = 'p',
17  className,
18  duration = 2,
19  spread = 2,
20}: TextShimmerProps) {
21  const MotionComponent = motion.create(
22    Component as keyof JSX.IntrinsicElements
23  );
24
25  const dynamicSpread = useMemo(() => {
26    return children.length * spread;
27  }, [children, spread]);
28
29  return (
30    <MotionComponent
31      className={cn(
32        'relative inline-block bg-[length:250%_100%,auto] bg-clip-text',
33        'text-transparent [--base-color:#a1a1aa] [--base-gradient-color:#000]',
34        '[--bg:linear-gradient(90deg,#0000_calc(50%-var(--spread)),var(--base-gradient-color),#0000_calc(50%+var(--spread)))] [background-repeat:no-repeat,padding-box]',
35        '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)))]',
36        className
37      )}
38      initial={{ backgroundPosition: '100% center' }}
39      animate={{ backgroundPosition: '0% center' }}
40      transition={{
41        repeat: Infinity,
42        duration,
43        ease: 'linear',
44      }}
45      style={
46        {
47          '--spread': `${dynamicSpread}px`,
48          backgroundImage: `var(--bg), linear-gradient(var(--base-color), var(--base-color))`,
49        } as React.CSSProperties
50      }
51    >
52      {children}
53    </MotionComponent>
54  );
55}
56