[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"playground-crypto-randomuuid-native-uuid":3,"verticals":17},{"slug":4,"title":5,"summary":6,"html":7,"css":8,"js":9,"config":10,"doc":13},"crypto-randomuuid-native-uuid","crypto.randomUUID() — interactive playground",null,"\u003Cdiv class=\"pg\">\n    \u003Ch1 class=\"pg-title\">🔑 crypto.randomUUID() live\u003C\u002Fh1>\n    \u003Cp class=\"pg-sub\">\n      Click \u003Cstrong>Generate\u003C\u002Fstrong> to call \u003Ccode>crypto.randomUUID()\u003C\u002Fcode> directly\n      — no import, no library, just the native Web Crypto API.\n      The UUID structure is highlighted below.\n    \u003C\u002Fp>\n\n    \u003C!-- Panel 1: single UUID generator -->\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">1\u003C\u002Fspan> Generate a UUID\u003C\u002Fdiv>\n      \u003Cdiv class=\"btn-row\">\n        \u003Cbutton class=\"btn primary\" id=\"genBtn\">Generate UUID\u003C\u002Fbutton>\n        \u003Cbutton class=\"btn sm\" id=\"copyBtn\">Copy\u003C\u002Fbutton>\n      \u003C\u002Fdiv>\n      \u003Cdiv class=\"uuid-display\" id=\"uuidDisplay\">—\u003C\u002Fdiv>\n      \u003Cdiv class=\"hint\" id=\"structHint\" style=\"display:none\">\n        Format: \u003Ccode>xxxxxxxx-xxxx-\u003Cstrong style=\"color:var(--good)\">4\u003C\u002Fstrong>xxx-\u003Cstrong style=\"color:var(--warn)\">y\u003C\u002Fstrong>xxx-xxxxxxxxxxxx\u003C\u002Fcode>\n        — the \u003Cspan style=\"color:var(--good);font-weight:700\">4\u003C\u002Fspan> is the version bit (v4 = random),\n        \u003Cspan style=\"color:var(--warn);font-weight:700\">y\u003C\u002Fspan> is the variant bits (8, 9, a, or b).\n      \u003C\u002Fdiv>\n      \u003Cdiv class=\"legend-row\" id=\"legend\" style=\"display:none\">\n        \u003Cdiv class=\"legend-item\">\n          \u003Cdiv class=\"legend-swatch\" style=\"background:var(--accent)\">\u003C\u002Fdiv>\n          \u003Cspan>random hex\u003C\u002Fspan>\n        \u003C\u002Fdiv>\n        \u003Cdiv class=\"legend-item\">\n          \u003Cdiv class=\"legend-swatch\" style=\"background:var(--good)\">\u003C\u002Fdiv>\n          \u003Cspan>version (always 4)\u003C\u002Fspan>\n        \u003C\u002Fdiv>\n        \u003Cdiv class=\"legend-item\">\n          \u003Cdiv class=\"legend-swatch\" style=\"background:var(--warn)\">\u003C\u002Fdiv>\n          \u003Cspan>variant (8\u002F9\u002Fa\u002Fb)\u003C\u002Fspan>\n        \u003C\u002Fdiv>\n      \u003C\u002Fdiv>\n    \u003C\u002Fdiv>\n\n    \u003C!-- Panel 2: batch generate -->\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">2\u003C\u002Fspan> Batch generate\u003C\u002Fdiv>\n      \u003Cdiv class=\"row\" style=\"margin-bottom:12px\">\n        \u003Cdiv class=\"field grow\">\n          \u003Clabel class=\"label\" for=\"countSel\">How many?\u003C\u002Flabel>\n          \u003Cselect id=\"countSel\">\n            \u003Coption value=\"5\">5 UUIDs\u003C\u002Foption>\n            \u003Coption value=\"10\" selected>10 UUIDs\u003C\u002Foption>\n            \u003Coption value=\"20\">20 UUIDs\u003C\u002Foption>\n            \u003Coption value=\"50\">50 UUIDs\u003C\u002Foption>\n          \u003C\u002Fselect>\n        \u003C\u002Fdiv>\n        \u003Cdiv style=\"padding-top:22px\">\n          \u003Cbutton class=\"btn\" id=\"batchBtn\">Generate batch\u003C\u002Fbutton>\n        \u003C\u002Fdiv>\n      \u003C\u002Fdiv>\n      \u003Cdiv class=\"uuid-list\" id=\"uuidList\">\n        \u003Cdiv style=\"color:var(--faint);font-size:0.82rem;padding:4px 0\">\n          Click \"Generate batch\" to see a list of fresh UUIDs\n        \u003C\u002Fdiv>\n      \u003C\u002Fdiv>\n      \u003Cp class=\"hint\" style=\"margin-top:10px\">\n        Every UUID is unique — \u003Ccode>crypto.randomUUID()\u003C\u002Fcode> draws from the\n        OS's CSPRNG, making collisions astronomically unlikely.\n      \u003C\u002Fp>\n    \u003C\u002Fdiv>\n\n    \u003C!-- Panel 3: before\u002Fafter comparison -->\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">3\u003C\u002Fspan> Before & after\u003C\u002Fdiv>\n      \u003Cdiv class=\"compare-grid\">\n        \u003Cdiv class=\"compare-card old\">\n          \u003Cdiv class=\"cc-label\">❌ Before — with the uuid package\u003C\u002Fdiv>\n          \u003Cdiv class=\"cc-code\">import { v4 as uuidv4 }\n  from 'uuid';\n\nconst id = uuidv4();\u003C\u002Fdiv>\n          \u003Cdiv class=\"cc-badge bad\">+ bundle weight\u003C\u002Fdiv>\n        \u003C\u002Fdiv>\n        \u003Cdiv class=\"compare-card native\">\n          \u003Cdiv class=\"cc-label\">✅ After — native\u003C\u002Fdiv>\n          \u003Cdiv class=\"cc-code\">\u002F\u002F no import needed\n\n\nconst id =\n  crypto.randomUUID();\u003C\u002Fdiv>\n          \u003Cdiv class=\"cc-badge good\">zero dependencies\u003C\u002Fdiv>\n        \u003C\u002Fdiv>\n      \u003C\u002Fdiv>\n      \u003Cp class=\"hint\" style=\"margin-top:12px\">\n        Both produce the same v4 UUID format. Both use \u003Ccode>crypto.getRandomValues()\u003C\u002Fcode>\n        under the hood. The native call removes the dependency entirely.\n      \u003C\u002Fp>\n    \u003C\u002Fdiv>\n\n    \u003C!-- Panel 4: live code snippet -->\n    \u003Cdiv class=\"panel\">\n      \u003Cdiv class=\"panel-label\">\u003Cspan class=\"n\">4\u003C\u002Fspan> Last generated UUID — copy-paste ready\u003C\u002Fdiv>\n      \u003Cdiv class=\"code\" id=\"codeSnippet\">\u002F\u002F Click \"Generate UUID\" above to see the result here\nconst id = crypto.randomUUID();\n\u002F\u002F → waiting for first generation...\u003C\u002Fdiv>\n    \u003C\u002Fdiv>\n  \u003C\u002Fdiv>","\u002F*\n * Shared playground design system — daily-post\n * ============================================\n * Link it from any post's playground\u002Findex.html (no per-post boilerplate):\n *\n *   \u003Clink rel=\"stylesheet\" href=\"..\u002F..\u002F..\u002Fplayground\u002Fassets\u002Fbase.css\" \u002F>\n *\n * The relative path resolves the same locally (posts\u002F\u003Cbase>\u002Fplayground\u002F) and on\n * the deployed host (public\u002Fposts\u002F\u003Cbase>\u002Fplayground\u002F), because build-site.js\n * mirrors this file to public\u002Fplayground\u002Fassets\u002Fbase.css. For a CodeSandbox\n * --embed, playground.js inlines this file so the single-file sandbox still styles.\n *\n * Then write ONLY the demo-specific CSS in your inline \u003Cstyle>. Everything below\n * — tokens, layout, panels, buttons, toggles, sliders, code blocks, status\u002Flog,\n * banners, presets — comes for free and looks consistent across every post.\n *\n * Theme-aware: dark by default, light via prefers-color-scheme AND a\n * [data-theme] override on \u003Chtml> (so a toggle can force either). Accessible:\n * real focus rings, adequate contrast, reduced-motion honored.\n *\u002F\n\n\u002F* ---------- design tokens ---------- *\u002F\n:root {\n  --bg: #0d1117;\n  --bg-grid: #ffffff0a;\n  --panel: #161b22;\n  --panel-2: #0b0e14;\n  --card: #0b0e14;\n  --ink: #e8ebf2;\n  --muted: #9aa4b2;\n  --faint: #6b7688;\n  --line: #232a35;\n  --line-soft: #ffffff12;\n  --accent: #7c9cff;\n  --accent-ink: #0b0e14;\n  --good: #3fb950;\n  --warn: #f0883e;\n  --bad: #f85149;\n  --info: #58a6ff;\n  --radius: 14px;\n  --radius-sm: 9px;\n  --shadow: 0 8px 30px #0006;\n  --shadow-sm: 0 4px 14px #0005;\n  --mono: ui-monospace, SFMono-Regular, \"SF Mono\", Menlo, Consolas, \"Liberation Mono\", monospace;\n  --sans: ui-sans-serif, system-ui, -apple-system, \"Segoe UI\", Roboto, \"Helvetica Neue\", sans-serif;\n  color-scheme: dark;\n}\n\n\u002F* Light theme — system preference, overridable by [data-theme] on \u003Chtml>. *\u002F\n@media (prefers-color-scheme: light) {\n  :root:not([data-theme=\"dark\"]) {\n    --bg: #f4f6fb;\n    --bg-grid: #00000008;\n    --panel: #ffffff;\n    --panel-2: #f0f3f9;\n    --card: #f7f9fc;\n    --ink: #131722;\n    --muted: #5b6472;\n    --faint: #8a93a3;\n    --line: #e2e7f0;\n    --line-soft: #00000010;\n    --accent: #2f6df0;\n    --accent-ink: #ffffff;\n    --good: #1a7f37;\n    --warn: #bc4c00;\n    --bad: #cf222e;\n    --info: #0969da;\n    --shadow: 0 8px 30px #0000001f;\n    --shadow-sm: 0 4px 14px #00000014;\n    color-scheme: light;\n  }\n}\n:root[data-theme=\"light\"] {\n  --bg: #f4f6fb;\n  --bg-grid: #00000008;\n  --panel: #ffffff;\n  --panel-2: #f0f3f9;\n  --card: #f7f9fc;\n  --ink: #131722;\n  --muted: #5b6472;\n  --faint: #8a93a3;\n  --line: #e2e7f0;\n  --line-soft: #00000010;\n  --accent: #2f6df0;\n  --accent-ink: #ffffff;\n  --good: #1a7f37;\n  --warn: #bc4c00;\n  --bad: #cf222e;\n  --info: #0969da;\n  --shadow: 0 8px 30px #0000001f;\n  --shadow-sm: 0 4px 14px #00000014;\n  color-scheme: light;\n}\n\n\u002F* ---------- reset & base ---------- *\u002F\n*, *::before, *::after { box-sizing: border-box; }\n\nbody {\n  margin: 0;\n  min-height: 100vh;\n  font-family: var(--sans);\n  color: var(--ink);\n  background:\n    radial-gradient(circle at 1px 1px, var(--bg-grid) 1px, transparent 0) 0 0 \u002F 24px 24px,\n    var(--bg);\n  display: flex;\n  justify-content: center;\n  align-items: flex-start;\n  padding: clamp(14px, 3vw, 26px);\n  line-height: 1.55;\n  -webkit-font-smoothing: antialiased;\n  text-rendering: optimizeLegibility;\n}\n\n\u002F* The single content column. *\u002F\n.pg {\n  width: 100%;\n  max-width: 860px;\n}\n\n\u002F* ---------- header ---------- *\u002F\n.pg-title {\n  font-size: clamp(1.15rem, 1rem + 1vw, 1.4rem);\n  font-weight: 800;\n  letter-spacing: -0.02em;\n  margin: 0 0 4px;\n  display: flex;\n  align-items: center;\n  gap: 9px;\n}\n.pg-sub {\n  color: var(--muted);\n  font-size: 0.92rem;\n  line-height: 1.5;\n  margin: 0 0 16px;\n  max-width: 66ch;\n}\n.pg-sub strong, .pg-sub b { color: var(--ink); font-weight: 700; }\n.pg-sub code { font-family: var(--mono); background: var(--line-soft); color: var(--accent);\n  padding: 1px 6px; border-radius: 6px; font-size: 0.85em; }\n\n\u002F* ---------- panels ---------- *\u002F\n.panel {\n  background: var(--panel);\n  border: 1px solid var(--line);\n  border-radius: var(--radius);\n  padding: 16px 18px;\n  margin-bottom: 14px;\n  box-shadow: var(--shadow-sm);\n}\n.panel-label {\n  font-size: 0.7rem;\n  text-transform: uppercase;\n  letter-spacing: 0.08em;\n  color: var(--muted);\n  font-weight: 800;\n  margin: 0 0 13px;\n  display: flex;\n  align-items: center;\n  gap: 8px;\n}\n.panel-label .n {\n  display: inline-grid; place-items: center;\n  width: 18px; height: 18px; border-radius: 50%;\n  background: var(--accent); color: var(--accent-ink);\n  font-size: 0.66rem; font-weight: 800;\n}\n\n\u002F* ---------- layout helpers ---------- *\u002F\n.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }\n.row.between { justify-content: space-between; }\n.col { display: flex; flex-direction: column; gap: 10px; }\n.grow { flex: 1 1 0; min-width: 0; }\n.wrap-controls { display: flex; flex-wrap: wrap; gap: 16px 24px; align-items: flex-end; }\n.field { display: flex; flex-direction: column; gap: 7px; min-width: 0; }\n.field > .label, .ctl-label {\n  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.04em;\n  color: var(--muted); font-weight: 800;\n}\n\n\u002F* ---------- buttons ---------- *\u002F\n.btn {\n  font: inherit; font-weight: 650; font-size: 0.88rem;\n  cursor: pointer; user-select: none;\n  border: 1px solid var(--line);\n  background: var(--card); color: var(--ink);\n  padding: 9px 15px; border-radius: var(--radius-sm);\n  display: inline-flex; align-items: center; gap: 8px;\n  transition: background .15s ease, border-color .15s ease, transform .05s ease, color .15s ease;\n}\n.btn:hover { background: var(--line-soft); border-color: var(--muted); }\n.btn:active { transform: translateY(1px); }\n.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }\n.btn[disabled] { opacity: 0.45; cursor: not-allowed; }\n.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }\n.btn.primary:hover { filter: brightness(1.08); background: var(--accent); }\n.btn.good { background: var(--good); border-color: var(--good); color: #04140a; }\n.btn.bad  { background: var(--bad);  border-color: var(--bad);  color: #fff; }\n.btn.ghost { background: transparent; }\n.btn.sm { padding: 6px 11px; font-size: 0.82rem; }\n\n.btn-row { display: flex; flex-wrap: wrap; gap: 9px; }\n\n\u002F* Segmented control — a row of buttons where one is active (aria-pressed). *\u002F\n.seg { display: inline-flex; background: var(--card); border: 1px solid var(--line);\n  border-radius: var(--radius-sm); padding: 3px; gap: 3px; }\n.seg button {\n  font: inherit; font-weight: 650; font-size: 0.84rem; cursor: pointer;\n  border: none; background: transparent; color: var(--muted);\n  padding: 7px 13px; border-radius: 7px;\n  transition: background .15s ease, color .15s ease;\n}\n.seg button:hover { color: var(--ink); }\n.seg button[aria-pressed=\"true\"] { background: var(--accent); color: var(--accent-ink); }\n.seg button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }\n\n\u002F* Preset chips — worked-example shortcuts. *\u002F\n.presets { display: flex; flex-wrap: wrap; gap: 8px; }\n.presets .btn { background: var(--panel-2); }\n\n\u002F* ---------- toggle switch ---------- *\u002F\n.toggle { display: inline-flex; align-items: center; gap: 10px; cursor: pointer;\n  font-size: 0.88rem; font-weight: 600; user-select: none; }\n.toggle input { position: absolute; opacity: 0; width: 0; height: 0; }\n.switch { position: relative; width: 44px; height: 25px; border-radius: 999px; flex: none;\n  background: var(--line); border: 1px solid var(--line); transition: background .18s ease; }\n.switch::after { content: \"\"; position: absolute; top: 2px; left: 2px; width: 19px; height: 19px;\n  border-radius: 50%; background: #cfd6e4; transition: transform .18s ease; box-shadow: 0 1px 3px #0006; }\n.toggle input:checked + .switch { background: var(--good); border-color: var(--good); }\n.toggle input:checked + .switch::after { transform: translateX(19px); background: #fff; }\n.toggle input:focus-visible + .switch { outline: 2px solid var(--accent); outline-offset: 2px; }\n\n\u002F* ---------- range slider ---------- *\u002F\ninput[type=\"range\"] {\n  -webkit-appearance: none; appearance: none; width: 100%; height: 6px;\n  background: var(--line); border-radius: 999px; outline: none; cursor: pointer; margin: 8px 0;\n}\ninput[type=\"range\"]::-webkit-slider-thumb {\n  -webkit-appearance: none; appearance: none; width: 19px; height: 19px; border-radius: 50%;\n  background: var(--accent); border: 2px solid var(--panel); box-shadow: var(--shadow-sm); cursor: pointer;\n}\ninput[type=\"range\"]::-moz-range-thumb {\n  width: 19px; height: 19px; border-radius: 50%; background: var(--accent);\n  border: 2px solid var(--panel); box-shadow: var(--shadow-sm); cursor: pointer;\n}\ninput[type=\"range\"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }\n\n\u002F* ---------- text inputs \u002F selects ---------- *\u002F\ninput[type=\"text\"], input[type=\"number\"], input[type=\"search\"], select, textarea {\n  font: inherit; color: var(--ink); background: var(--card);\n  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 8px 11px; width: 100%;\n}\ntextarea { font-family: var(--mono); font-size: 0.85rem; line-height: 1.6; resize: vertical; }\ninput:focus-visible, select:focus-visible, textarea:focus-visible {\n  outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent);\n}\n\n\u002F* ---------- status \u002F output \u002F log ---------- *\u002F\n.status {\n  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;\n  font-size: 0.9rem; font-weight: 600;\n  padding: 11px 14px; border-radius: var(--radius-sm);\n  background: var(--panel-2); border: 1px solid var(--line); color: var(--ink);\n}\n.status.good { border-color: color-mix(in srgb, var(--good) 55%, var(--line)); }\n.status.warn { border-color: color-mix(in srgb, var(--warn) 55%, var(--line)); }\n.status.bad  { border-color: color-mix(in srgb, var(--bad) 55%, var(--line)); }\n.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); flex: none; }\n.dot.good { background: var(--good); } .dot.warn { background: var(--warn); }\n.dot.bad { background: var(--bad); } .dot.info { background: var(--info); }\n\n.output { background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius-sm);\n  padding: 13px 15px; }\n.log { font-family: var(--mono); font-size: 0.8rem; line-height: 1.7; background: var(--card);\n  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 11px 14px;\n  max-height: 220px; overflow-y: auto; white-space: pre-wrap; }\n\n\u002F* ---------- code block + syntax tokens ---------- *\u002F\n.code {\n  font-family: var(--mono); font-size: 0.82rem; line-height: 1.7;\n  background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius-sm);\n  padding: 13px 15px; overflow-x: auto; white-space: pre; tab-size: 2;\n}\n.code .tok-sel  { color: var(--accent); }\n.code .tok-prop { color: #86e29b; }\n.code .tok-kw   { color: #ff9bcb; }\n.code .tok-str  { color: #f0c674; }\n.code .tok-num  { color: #f0883e; }\n.code .tok-cmt  { color: var(--faint); font-style: italic; }\n.code .hl { background: color-mix(in srgb, var(--good) 22%, transparent); border-radius: 4px; padding: 0 3px; }\n\n\u002F* ---------- hint \u002F caption ---------- *\u002F\n.hint { font-size: 0.83rem; color: var(--muted); line-height: 1.55; margin: 10px 0 0; }\n.hint code { font-family: var(--mono); color: var(--ink); background: var(--line-soft);\n  padding: 1px 5px; border-radius: 5px; font-size: 0.86em; }\n.hint strong { color: var(--ink); }\n\n\u002F* ---------- banner (feature-support \u002F notices) ---------- *\u002F\n.banner {\n  display: none; margin-bottom: 14px; padding: 11px 14px; border-radius: 11px;\n  font-size: 0.85rem; line-height: 1.5;\n  color: var(--ink); background: color-mix(in srgb, var(--warn) 12%, var(--panel));\n  border: 1px solid color-mix(in srgb, var(--warn) 45%, var(--line));\n}\n.banner.show { display: block; }\n.banner.info { background: color-mix(in srgb, var(--info) 12%, var(--panel));\n  border-color: color-mix(in srgb, var(--info) 45%, var(--line)); }\n.banner code { font-family: var(--mono); background: var(--line-soft); padding: 1px 5px; border-radius: 5px; }\n\n\u002F* ---------- misc atoms ---------- *\u002F\n.pill { display: inline-flex; align-items: center; gap: 6px; font-size: 0.75rem; font-weight: 700;\n  padding: 3px 9px; border-radius: 999px; background: var(--line-soft); color: var(--muted); }\n.pill.good { color: var(--good); background: color-mix(in srgb, var(--good) 16%, transparent); }\n.pill.bad  { color: var(--bad);  background: color-mix(in srgb, var(--bad) 16%, transparent); }\n.mono { font-family: var(--mono); }\n.muted { color: var(--muted); }\n.big-num { font-family: var(--mono); font-size: 1.6rem; font-weight: 800; letter-spacing: -0.02em; }\n\n\u002F* Optional theme toggle button (top-right). Wire it in JS if you want it. *\u002F\n.theme-btn { position: fixed; top: 12px; right: 12px; z-index: 20; }\n\n\u002F* ---------- responsive ---------- *\u002F\n@media (max-width: 560px) {\n  .panel { padding: 14px; }\n  .wrap-controls { gap: 14px; }\n  .btn { padding: 9px 13px; }\n}\n\n\u002F* ---------- reduced motion ---------- *\u002F\n@media (prefers-reduced-motion: reduce) {\n  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }\n}\n\n\n.uuid-display {\n    font-family: var(--mono);\n    font-size: clamp(1rem, 2.5vw, 1.3rem);\n    font-weight: 700;\n    letter-spacing: 0.03em;\n    color: var(--accent);\n    word-break: break-all;\n    min-height: 1.8em;\n    padding: 12px 0 4px;\n  }\n\n  .uuid-seg { color: var(--accent); }\n  .uuid-dash { color: var(--faint); }\n  .uuid-version { color: var(--good); }\n  .uuid-variant { color: var(--warn); }\n\n  .legend-row {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 8px 16px;\n    margin-top: 10px;\n  }\n  .legend-item {\n    display: flex;\n    align-items: center;\n    gap: 6px;\n    font-size: 0.78rem;\n    color: var(--muted);\n  }\n  .legend-swatch {\n    width: 12px;\n    height: 12px;\n    border-radius: 3px;\n    flex: none;\n  }\n\n  .uuid-list {\n    font-family: var(--mono);\n    font-size: 0.82rem;\n    line-height: 2;\n    color: var(--ink);\n    background: var(--panel-2);\n    border: 1px solid var(--line);\n    border-radius: var(--radius-sm);\n    padding: 10px 14px;\n    max-height: 200px;\n    overflow-y: auto;\n  }\n  .uuid-list .entry {\n    display: flex;\n    align-items: center;\n    gap: 10px;\n    border-bottom: 1px solid var(--line-soft);\n    padding: 2px 0;\n  }\n  .uuid-list .entry:last-child { border-bottom: none; }\n  .uuid-list .entry .idx { color: var(--faint); min-width: 2ch; text-align: right; }\n  .uuid-list .entry .val { color: var(--accent); }\n\n  .compare-grid {\n    display: grid;\n    grid-template-columns: 1fr 1fr;\n    gap: 12px;\n  }\n  @media (max-width: 520px) {\n    .compare-grid { grid-template-columns: 1fr; }\n  }\n  .compare-card {\n    background: var(--panel-2);\n    border: 1px solid var(--line);\n    border-radius: var(--radius-sm);\n    padding: 12px 14px;\n  }\n  .compare-card .cc-label {\n    font-size: 0.7rem;\n    text-transform: uppercase;\n    letter-spacing: 0.07em;\n    color: var(--muted);\n    font-weight: 800;\n    margin-bottom: 8px;\n  }\n  .compare-card .cc-code {\n    font-family: var(--mono);\n    font-size: 0.78rem;\n    white-space: pre;\n    line-height: 1.7;\n    color: var(--ink);\n  }\n  .compare-card.native { border-color: color-mix(in srgb, var(--good) 55%, var(--line)); }\n  .compare-card.native .cc-label { color: var(--good); }\n  .compare-card.old { border-color: color-mix(in srgb, var(--bad) 30%, var(--line)); }\n  .compare-card.old .cc-label { color: var(--bad); }\n  .cc-badge {\n    display: inline-flex;\n    align-items: center;\n    gap: 5px;\n    font-size: 0.72rem;\n    font-weight: 700;\n    padding: 2px 8px;\n    border-radius: 20px;\n    margin-top: 8px;\n  }\n  .cc-badge.good { color: var(--good); background: color-mix(in srgb, var(--good) 14%, transparent); }\n  .cc-badge.bad  { color: var(--bad);  background: color-mix(in srgb, var(--bad) 14%, transparent); }","const genBtn    = document.getElementById('genBtn');\n    const copyBtn   = document.getElementById('copyBtn');\n    const uuidDisp  = document.getElementById('uuidDisplay');\n    const structHint = document.getElementById('structHint');\n    const legend    = document.getElementById('legend');\n    const batchBtn  = document.getElementById('batchBtn');\n    const countSel  = document.getElementById('countSel');\n    const uuidList  = document.getElementById('uuidList');\n    const codeSnip  = document.getElementById('codeSnippet');\n\n    let lastUUID = '';\n\n    function colorizeUUID(uuid) {\n      \u002F\u002F UUID format: 8-4-4-4-12\n      \u002F\u002F Position 14 is version (always '4'), position 19 is variant (8\u002F9\u002Fa\u002Fb)\n      const parts = uuid.split('-');\n      function colorPart(str, partIndex, offset) {\n        return [...str].map((ch, i) => {\n          const abs = offset + i;\n          if (partIndex === 2 && i === 0) {\n            return `\u003Cspan class=\"uuid-version\">${ch}\u003C\u002Fspan>`;\n          }\n          if (partIndex === 3 && i === 0) {\n            return `\u003Cspan class=\"uuid-variant\">${ch}\u003C\u002Fspan>`;\n          }\n          return `\u003Cspan class=\"uuid-seg\">${ch}\u003C\u002Fspan>`;\n        }).join('');\n      }\n      let offset = 0;\n      const colored = parts.map((p, idx) => {\n        const r = colorPart(p, idx, offset);\n        offset += p.length + 1;\n        return r;\n      });\n      return colored.join('\u003Cspan class=\"uuid-dash\">-\u003C\u002Fspan>');\n    }\n\n    function generateOne() {\n      const id = crypto.randomUUID();\n      lastUUID = id;\n      uuidDisp.innerHTML = colorizeUUID(id);\n      structHint.style.display = 'block';\n      legend.style.display = 'flex';\n      codeSnip.textContent = `const id = crypto.randomUUID();\\n\u002F\u002F → \"${id}\"`;\n    }\n\n    function copyToClipboard() {\n      if (!lastUUID) return;\n      navigator.clipboard.writeText(lastUUID).then(() => {\n        const old = copyBtn.textContent;\n        copyBtn.textContent = 'Copied!';\n        setTimeout(() => { copyBtn.textContent = old; }, 1200);\n      }).catch(() => {\n        copyBtn.textContent = 'Copy failed';\n        setTimeout(() => { copyBtn.textContent = 'Copy'; }, 1200);\n      });\n    }\n\n    function generateBatch() {\n      const count = parseInt(countSel.value, 10);\n      uuidList.innerHTML = '';\n      for (let i = 0; i \u003C count; i++) {\n        const id = crypto.randomUUID();\n        const entry = document.createElement('div');\n        entry.className = 'entry';\n        entry.innerHTML = `\u003Cspan class=\"idx\">${i + 1}\u003C\u002Fspan>\u003Cspan class=\"val\">${id}\u003C\u002Fspan>`;\n        uuidList.appendChild(entry);\n      }\n    }\n\n    genBtn.addEventListener('click', generateOne);\n    copyBtn.addEventListener('click', copyToClipboard);\n    batchBtn.addEventListener('click', generateBatch);\n\n    \u002F\u002F Generate one on load so the playground isn't empty\n    generateOne();",{"height":11,"autorun":12},520,true,{"slug":4,"title":14,"excerpt":15,"coverUrl":16},"Stop importing `uuid`. `crypto.randomUUID()` has been native since 2021.","The `uuid` package is downloaded hundreds of millions of times a week. Most installs exist to call uuid\u002Fv4 — exactly what `crypto.randomUUID()` does natively, with no import, no bundle cost, and guaranteed cryptographic randomness.","\u002Fmedia\u002Fcovers\u002Fcrypto-randomuuid-native-uuid.png",[18,33],{"id":19,"slug":20,"name":21,"tagline":22,"description":23,"accentFrom":24,"accentTo":25,"icon":26,"defaultLocale":27,"locales":28,"features":30,"position":32},"019fe637-3d33-714b-b57f-23e163ffca0c","dev","Web Development","Build. Learn. Ship.","Practical courses, engineering-grade articles and open-source tools for people who ship.","violet-500","cyan-400","◇","en",[27,29],"fa",{"courses":12,"paths":12,"articles":12,"exams":31,"flashcards":31,"packages":12,"community":12,"certificates":12,"teams":12,"commerce":12},false,0,{"id":34,"slug":35,"name":36,"tagline":37,"description":38,"accentFrom":39,"accentTo":24,"icon":40,"defaultLocale":27,"locales":41,"features":43,"position":44},"019fe637-3dc2-754c-8657-0f175bfee7c6","lang","Languages","Learn a language the way you learn a codebase.","Structured paths, listening drills and spaced repetition that actually sticks.","amber-400","⌘",[27,29,42],"es",{"courses":12,"paths":12,"articles":31,"exams":31,"flashcards":31,"packages":31,"community":12,"certificates":31,"teams":31,"commerce":12},2]