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TypingEffect.jsx

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+import React, { useState, useEffect } from 'react';
+
+export default function TypingEffect({
+  steps = [],
+  loop = true,
+  typingSpeed = [40, 120],
+  deleteSpeed = [20, 60],
+}) {
+  const [displayed, setDisplayed] = useState('');
+  const [showCursor, setShowCursor] = useState(true);
+  const [cursorBlink, setCursorBlink] = useState(true);
+
+  const configKey = JSON.stringify({ steps, loop, typingSpeed, deleteSpeed });
+
+  useEffect(() => {
+    let cancelled = false;
+    let timerId = null;
+
+    const sleep = (ms) =>
+      new Promise((resolve) => {
+        timerId = setTimeout(resolve, ms);
+      });
+
+    const rand = ([min, max]) =>
+      Math.floor(min + Math.random() * (max - min + 1));
+
+    const run = async () => {
+      do {
+        let chars = [];
+        setDisplayed('');
+
+        for (const step of steps) {
+          if (cancelled) return;
+
+          if ('text' in step) {
+            const speed = step.speed || typingSpeed;
+            for (const c of Array.from(step.text)) {
+              if (cancelled) return;
+              chars.push(c);
+              setDisplayed(chars.join(''));
+              await sleep(rand(speed));
+            }
+          } else if ('pause' in step) {
+            await sleep(step.pause);
+          } else if ('delete' in step) {
+            const speed = step.speed || deleteSpeed;
+            const count =
+              step.delete === 'all'
+                ? chars.length
+                : Math.min(step.delete, chars.length);
+            for (let i = 0; i < count; i++) {
+              if (cancelled) return;
+              chars.pop();
+              setDisplayed(chars.join(''));
+              await sleep(rand(speed));
+            }
+          }
+        }
+
+        if (!loop) {
+          setShowCursor(false);
+          return;
+        }
+
+        await sleep(500);
+      } while (!cancelled);
+    };
+
+    run();
+
+    return () => {
+      cancelled = true;
+      if (timerId != null) clearTimeout(timerId);
+    };
+  }, [configKey]);
+
+  useEffect(() => {
+    if (!showCursor) return;
+    const id = setInterval(() => setCursorBlink((v) => !v), 530);
+    return () => clearInterval(id);
+  }, [showCursor]);
+
+  const parts = displayed.split('\n');
+
+  return (
+    <span>
+      {parts.map((part, i) => (
+        <React.Fragment key={i}>
+          {i > 0 && <br />}
+          {part}
+        </React.Fragment>
+      ))}
+      {showCursor && (
+        <span
+          aria-hidden="true"
+          style={{
+            display: 'inline-block',
+            width: '2px',
+            height: '1em',
+            backgroundColor: 'currentColor',
+            marginLeft: '1px',
+            verticalAlign: 'text-bottom',
+            opacity: cursorBlink ? 1 : 0,
+          }}
+        />
+      )}
+    </span>
+  );
+}