05Delete and retype

<main class="stage">
  <p class="search"><span class="search__text">Search for anything</span></p>
</main>

@use "../../../../site/static/demo-tokens" as *;

$duration: $dur-loop;                      // 타이핑+삭제 한 루프
$easing: steps(11, end);                   // 글자 수만큼 뚝뚝 끊어 늘고 준다
$color: $subject-blue;                     // 커서 색

@include stage($stage-ink);

.search {
  margin: 0;

  &__text {
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    width: 0;
    border-right: .1em solid $color;
    font-weight: 700; font-size: clamp(18px, 5.2vw, 30px); line-height: 1.4; font-family: inherit;
    color: $subject-cream;
    animation: search-loop $duration linear infinite;
  }
}

@keyframes search-loop {
  0%, 6%   { width: 0; animation-timing-function: $easing; }
  46%      { width: var(--full, 11ch); }
  62%      { width: var(--full, 11ch); animation-timing-function: $easing; }
  96%, 100% { width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .search__text { animation: none; width: var(--full, 11ch); border-right-color: transparent; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.search {
  margin: 0;
}
.search__text {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  width: 0;
  border-right: 0.1em solid #2f6df6;
  font-weight: 700;
  font-size: clamp(18px, 5.2vw, 30px);
  line-height: 1.4;
  font-family: inherit;
  color: #fff7e6;
  animation: search-loop 2s linear infinite;
}

@keyframes search-loop {
  0%, 6% {
    width: 0;
    animation-timing-function: steps(11, end);
  }
  46% {
    width: var(--full, 11ch);
  }
  62% {
    width: var(--full, 11ch);
    animation-timing-function: steps(11, end);
  }
  96%, 100% {
    width: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .search__text {
    animation: none;
    width: var(--full, 11ch);
    border-right-color: transparent;
  }
}

(function () {
  var el = document.querySelector('.search__text'), cv = document.createElement('canvas').getContext('2d');
  cv.font = getComputedStyle(el).font;
  el.style.setProperty('--full', Math.ceil(cv.measureText(el.textContent).width) + 'px');
})();

import { useEffect, useRef } from "react";
import type { CSSProperties } from "react";
import styles from "./DeleteRetype.module.scss";

export type DeleteRetypeProps = {
  text: string;
  /** 타이핑+삭제 한 루프 (기본 2000ms) */
  duration?: number;
  color?: string;
};

export default function DeleteRetype({ text, duration = 2000, color = "#2f6df6" }: DeleteRetypeProps) {
  const ref = useRef<HTMLSpanElement | null>(null);
  useEffect(() => {
    const el = ref.current;
    const cv = el && document.createElement("canvas").getContext("2d");
    if (!el || !cv) return;
    cv.font = getComputedStyle(el).font;
    el.style.setProperty("--full", Math.ceil(cv.measureText(text).width) + "px");
  }, [text]);
  const vars = { "--duration": `${duration}ms`, "--color": color, "--easing": `steps(${text.length}, end)` } as CSSProperties;
  return (
    <p className={styles.search} style={vars}>
      <span ref={ref} className={styles.text}>{text}</span>
    </p>
  );
}