Install
That writes one file:compositions/code-typing.html.
Source
code-typing.html
code-typing.html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Code Typing</title>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
width: 1920px;
height: 1080px;
overflow: hidden;
background: #05070b;
}
#root {
position: relative;
width: 1920px;
height: 1080px;
font-family: "JetBrains Mono", monospace;
color: #e6edf3;
}
.bg-field {
position: absolute;
inset: 0;
background: radial-gradient(1200px 700px at 50% 18%, #0e1726 0%, #070b12 55%, #05070b 100%);
}
.bg-grid {
position: absolute;
inset: 0;
background-image:
linear-gradient(rgba(88, 166, 255, 0.05) 1px, transparent 1px),
linear-gradient(90deg, rgba(88, 166, 255, 0.05) 1px, transparent 1px);
background-size: 64px 64px;
mask-image: radial-gradient(1100px 620px at 50% 42%, #000 0%, transparent 78%);
}
.bg-glow {
position: absolute;
width: 900px;
height: 900px;
border-radius: 50%;
filter: blur(120px);
opacity: 0.5;
}
.bg-glow.a {
background: #1f6feb55;
left: -180px;
top: -200px;
}
.bg-glow.b {
background: #2ea04355;
right: -200px;
bottom: -260px;
}
.editor {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
width: 1380px;
height: 800px;
background: #0b0f17;
border: 1px solid #1d2733;
border-radius: 16px;
box-shadow:
0 40px 120px rgba(0, 0, 0, 0.6),
0 2px 0 rgba(255, 255, 255, 0.03) inset;
overflow: hidden;
display: flex;
flex-direction: column;
}
.titlebar {
height: 56px;
flex: 0 0 56px;
display: flex;
align-items: center;
gap: 16px;
padding: 0 22px;
background: linear-gradient(#11161f, #0c111a);
border-bottom: 1px solid #1b2430;
}
.dots {
display: flex;
gap: 10px;
}
.dot {
width: 14px;
height: 14px;
border-radius: 50%;
}
.dot.r {
background: #ff5f57;
}
.dot.y {
background: #febc2e;
}
.dot.g {
background: #28c840;
}
.filename {
font-size: 19px;
color: #8b98a9;
letter-spacing: 0.2px;
}
.filename .accent {
color: #d6e2f0;
}
.code-surface {
position: relative;
flex: 1 1 auto;
overflow: hidden;
}
.scene {
position: absolute;
inset: 0;
opacity: 0;
will-change: opacity;
}
.code {
position: absolute;
top: 38px;
left: 0;
right: 0;
padding: 0 44px 0 104px;
font-size: 30px;
line-height: 46px;
font-variant-ligatures: none;
tab-size: 2;
}
.gutter {
position: absolute;
top: 38px;
left: 0;
width: 84px;
padding-right: 18px;
font-size: 30px;
line-height: 46px;
text-align: right;
color: #828c9b;
user-select: none;
}
.ln {
display: block;
height: 46px;
}
.line {
display: block;
min-height: 46px;
white-space: pre;
position: relative;
z-index: 1;
}
.tok {
display: inline-block;
white-space: pre;
will-change: transform, opacity;
}
.caret {
position: absolute;
top: 0;
left: 0;
width: 3px;
height: 32px;
margin-top: 6px;
background: #58a6ff;
border-radius: 1px;
z-index: 3;
}
.hl-box {
position: absolute;
background: rgba(88, 166, 255, 0.16);
border-left: 3px solid #58a6ff;
border-radius: 6px;
z-index: 0;
overflow: hidden;
}
.diff-line {
display: block;
min-height: 0;
line-height: 46px;
white-space: pre;
position: relative;
overflow: hidden;
padding-left: 14px;
}
.diff-sign {
display: inline-block;
width: 22px;
color: #41506220;
}
.diff-del {
background: rgba(248, 81, 73, 0.12);
box-shadow: inset 3px 0 #f85149;
}
.diff-add {
background: rgba(63, 185, 80, 0.12);
box-shadow: inset 3px 0 #3fb950;
}
.diff-del .diff-sign {
color: #f85149;
}
.diff-add .diff-sign {
color: #3fb950;
}
.flight-block {
position: absolute;
white-space: pre;
font-size: 27px;
line-height: 40px;
padding: 11px 22px;
border-radius: 11px;
background: #0f1722;
border: 1px solid #233044;
box-shadow: 0 16px 44px rgba(0, 0, 0, 0.5);
will-change: transform, opacity;
}
.flight-target {
position: absolute;
border: 1.5px dashed #2a3a4f;
border-radius: 14px;
opacity: 0;
}
</style>
</head>
<body>
<div
id="root"
data-composition-id="code-typing"
data-start="0"
data-duration="5"
data-width="1920"
data-height="1080"
>
<div class="bg-field" data-layout-ignore></div>
<div class="bg-grid" data-layout-ignore></div>
<div class="bg-glow a" data-layout-ignore></div>
<div class="bg-glow b" data-layout-ignore></div>
<div class="editor" id="editor" data-layout-ignore>
<div class="titlebar">
<div class="dots">
<span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
</div>
<span class="filename"><span class="accent">loadConfig.js</span> — Code Typing</span>
</div>
<div class="code-surface" id="surface"></div>
</div>
</div>
<script>
window.__TOKENS = {
feature: {
lang: "js",
theme: "github-dark",
bg: "#24292e",
fg: "#e1e4e8",
states: [
{
code: 'async function loadConfig(path) {\n const raw = await readFile(path, "utf8")\n const config = JSON.parse(raw)\n return validate(config)\n}',
tokens: [
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-0",
content: "async",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-1",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-2",
content: "function",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-3",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-4",
content: "loadConfig",
color: "#B392F0",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-5",
content: "(",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-6",
content: "path",
color: "#FFAB70",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-7",
content: ") {",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-8",
content: "\n",
color: "#e1e4e8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-9",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-10",
content: "const",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-11",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-12",
content: "raw",
color: "#79B8FF",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-13",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-14",
content: "=",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-15",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-16",
content: "await",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-17",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-18",
content: "readFile",
color: "#B392F0",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-19",
content: "(path,",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-20",
content: " ",
color: "#e1e4e8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-21",
content: '"utf8"',
color: "#9ECBFF",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-22",
content: ")",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-23",
content: "\n",
color: "#e1e4e8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-24",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-25",
content: "const",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-26",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-27",
content: "config",
color: "#79B8FF",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-28",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-29",
content: "=",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-30",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-31",
content: "JSON",
color: "#79B8FF",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-32",
content: ".",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-33",
content: "parse",
color: "#B392F0",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-34",
content: "(raw)",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-35",
content: "\n",
color: "#e1e4e8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-36",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-37",
content: "return",
color: "#F97583",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-38",
content: " ",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-39",
content: "validate",
color: "#B392F0",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-40",
content: "(config)",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-41",
content: "\n",
color: "#e1e4e8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-42",
content: "}",
color: "#E1E4E8",
fontStyle: 0,
},
{
key: "SPx9u4TyzfMqSHpbjPHnWFQU8lPVEPieF6W5Vtu-bNA-43",
content: "\n",
color: "#e1e4e8",
fontStyle: 0,
},
],
},
],
},
};
window.__BLOCK = { id: "code-typing", effect: "typing", seq: "feature", duration: 5 };
</script>
<script>
// hf-code-anim.js — self-contained code-animation engine for HyperFrames registry blocks.
//
// Reuses Shiki Magic Move's baked output (window.__TOKENS, baked at author time) and
// drives the animation as a PAUSED GSAP timeline the HyperFrames engine seeks per frame —
// NOT CSS transitions (those break under non-sequential frame seeking). FLIP measurement
// runs once inside document.fonts.ready (glyph metrics must be final). Each block sets
// window.__BLOCK = { id, effect, seq, line?, duration } and includes this engine; the
// engine builds one scene that fills the composition and registers window.__timelines[id].
(function () {
"use strict";
var T = window.__TOKENS || {};
function lineDiv() {
var d = document.createElement("div");
d.className = "line";
return d;
}
// Render a code state's keyed tokens into codeEl as lines of inline-block .tok spans.
function renderState(codeEl, state) {
codeEl.textContent = "";
var keyToEl = new Map();
var line = lineDiv();
codeEl.appendChild(line);
for (var i = 0; i < state.tokens.length; i++) {
var t = state.tokens[i];
if (t.content === "\n") {
line = lineDiv();
codeEl.appendChild(line);
continue;
}
var span = document.createElement("span");
span.className = "tok";
span.textContent = t.content;
span.style.color = t.color;
if (t.fontStyle & 1) span.style.fontStyle = "italic";
if (t.fontStyle & 2) span.style.fontWeight = "700";
line.appendChild(span);
keyToEl.set(t.key, span);
}
var last = codeEl.lastChild;
if (last && last.className === "line" && last.children.length === 0)
codeEl.removeChild(last);
return keyToEl;
}
function rectsOf(keyToEl) {
var m = new Map();
keyToEl.forEach(function (el, k) {
var r = el.getBoundingClientRect();
m.set(k, { left: r.left, top: r.top });
});
return m;
}
function makeScene(surface, withGutter) {
var scene = document.createElement("div");
scene.className = "scene";
if (withGutter) {
var g = document.createElement("div");
g.className = "gutter";
scene.appendChild(g);
}
var code = document.createElement("div");
code.className = "code";
scene.appendChild(code);
surface.appendChild(scene);
return { scene: scene, code: code, gutter: scene.querySelector(".gutter") };
}
function fillGutter(g, n) {
var html = "";
for (var i = 1; i <= n; i++) html += '<span class="ln">' + i + "</span>";
g.innerHTML = html;
}
function splitLines(state) {
var lines = [{ text: "", tokens: [] }];
for (var i = 0; i < state.tokens.length; i++) {
var t = state.tokens[i];
if (t.content === "\n") {
lines.push({ text: "", tokens: [] });
continue;
}
var cur = lines[lines.length - 1];
cur.tokens.push(t);
cur.text += t.content;
}
if (lines.length && lines[lines.length - 1].tokens.length === 0) lines.pop();
return lines;
}
function lineDiff(a, b) {
var n = a.length;
var m = b.length;
var dp = [];
for (var i = 0; i <= n; i++) dp.push(new Array(m + 1).fill(0));
for (var i = n - 1; i >= 0; i--) {
for (var j = m - 1; j >= 0; j--) {
dp[i][j] =
a[i].text === b[j].text
? dp[i + 1][j + 1] + 1
: Math.max(dp[i + 1][j], dp[i][j + 1]);
}
}
var ops = [];
var i = 0;
var j = 0;
while (i < n && j < m) {
if (a[i].text === b[j].text) {
ops.push({ type: "same", line: b[j] });
i++;
j++;
} else if (dp[i + 1][j] >= dp[i][j + 1]) {
ops.push({ type: "del", line: a[i] });
i++;
} else {
ops.push({ type: "add", line: b[j] });
j++;
}
}
while (i < n) ops.push({ type: "del", line: a[i++] });
while (j < m) ops.push({ type: "add", line: b[j++] });
return ops;
}
// ---- single-scene effect builders (fade in, play, hold to end) -------------
var FADE = 0.45;
function typing(tl, surface, state, start) {
var PER = 0.028; // seconds per character — smooth, fast typewriter
var parts = makeScene(surface, true);
var code = parts.code;
// Per-CHARACTER render (granular reveal reads smoother than per-token pops).
code.textContent = "";
var line = document.createElement("div");
line.className = "line";
code.appendChild(line);
var chars = [];
for (var i = 0; i < state.tokens.length; i++) {
var t = state.tokens[i];
if (t.content === "\n") {
line = document.createElement("div");
line.className = "line";
code.appendChild(line);
continue;
}
for (var c = 0; c < t.content.length; c++) {
var span = document.createElement("span");
span.className = "tok";
span.textContent = t.content[c];
span.style.color = t.color;
if (t.fontStyle & 1) span.style.fontStyle = "italic";
if (t.fontStyle & 2) span.style.fontWeight = "700";
line.appendChild(span);
chars.push({ el: span, ws: t.content[c] === " " });
}
}
var last = code.lastChild;
if (last && last.className === "line" && last.children.length === 0)
code.removeChild(last);
fillGutter(parts.gutter, code.querySelectorAll(".line").length);
var base = code.getBoundingClientRect();
var caret = document.createElement("div");
caret.className = "caret";
code.appendChild(caret);
tl.set(parts.scene, { opacity: 0 }, 0);
tl.to(parts.scene, { opacity: 1, duration: FADE, ease: "power1.out" }, start);
var t0 = start + FADE;
if (chars.length) {
var r0 = chars[0].el.getBoundingClientRect();
tl.set(caret, { x: r0.left - base.left, y: r0.top - base.top, opacity: 1 }, 0);
}
chars.forEach(function (c, i) {
var at = t0 + i * PER;
tl.set(c.el, { opacity: 0 }, 0);
// soft per-char fade (overlaps neighbors → smooth wave); whitespace appears instantly
tl.to(c.el, { opacity: 1, duration: c.ws ? 0.01 : 0.12, ease: "power1.out" }, at);
// caret glides at constant speed to each char's right edge (linear = no stop-start jitter)
var r = c.el.getBoundingClientRect();
tl.to(
caret,
{ x: r.right - base.left, y: r.top - base.top, duration: PER, ease: "none" },
at,
);
});
}
function buildEffect(tl, surface, spec) {
var start = 0.45;
var seq = T[spec.seq];
if (spec.effect === "typing") typing(tl, surface, seq.states[0], start);
}
function go() {
var spec = window.__BLOCK;
var surface = document.getElementById("surface");
var root = document.getElementById("root");
window.__timelines = window.__timelines || {};
var tl = gsap.timeline({ paused: true });
// Build inside fonts.ready (glyph metrics must be final), then register.
// Register ONLY after the timeline is fully built: the runtime's
// sub-composition readiness gate treats "key present" as "ready" and
// nests the child once. An empty timeline registered before this build
// would be nested empty and never re-nested → blank render when used as
// a sub-composition. See the contract in engine frameCapture.ts.
document.fonts.ready.then(function () {
tl.from("#editor", { opacity: 0, scale: 0.985, duration: 0.5, ease: "power2.out" }, 0);
buildEffect(tl, surface, spec);
var dur = parseFloat(root.dataset.duration) || tl.duration();
tl.to({}, { duration: dur }, 0); // pad to full composition length
window.__timelines["code-typing"] = tl; // register AFTER setup completes
if (typeof window.__hfForceTimelineRebind === "function") {
window.__hfForceTimelineRebind(); // re-nest now that we are populated
}
});
}
if (document.readyState === "loading") document.addEventListener("DOMContentLoaded", go);
else go();
})();
</script>
</body>
</html>
Usage
After installing, add the block to your host composition:<div data-composition-id="code-typing" data-composition-src="compositions/code-typing.html" data-start="0" data-duration="5" data-track-index="1" data-width="1920" data-height="1080"></div>
code code-animation typing developer.