Get your spark back. HTML that reacts!.

Scaffold a spark-html app — dev/build/preview on Bun

Declarative <template route> client routing for spark-html — no JS config, just markup.

Reactive document <title> and <meta> per route for spark-html — one line, no dependencies.

Build-time image optimization for spark-html sites — a spark-html-bun build step that converts <img> references to webp/avif with responsive srcset, zero config.

A tiny in-page devtools panel for spark-html — live store state, component tree, and patch activity.

One-line dark/light/system theming for spark-html — a reactive `theme` store, data-theme attribute, system watch, and localStorage persistence.

PWA manifest + icons + offline app shell for spark-html sites from a single config — a spark-html-bun build step that generates manifest.webmanifest, resizes icons, injects the head tags, and optionally emits a minimal service worker.

Declarative enter/leave transitions for spark-html — transition="fade|slide|scale" on if/each blocks, Web Animations API, 0 deps, no compiler.

Declarative async data for spark-html — a self-fetching reactive store with loading/error/refetch. One dependency.

Persist a spark-html store across reloads in one line — hydrate from localStorage/sessionStorage, save on every change.

Declarative WebSocket for spark-html — a reactive store with auto-reconnect, JSON parsing, status, and send(). Zero dependencies.

Font loading optimizer for spark-html sites — @font-face + preload + size-adjusted fallbacks in one config, no FOUT, no layout shift. Zero dependencies.

Language server (LSP) for spark-html single-file components, including spark-ssr pages — diagnostics (undefined bindings, unused imports, script errors, missing key), spark-ssr-aware inferred page data & ambient helpers, semantic highlighting + formatting

Build-time prerender (SEO) for spark-html — reuses the real runtime, no SSR server, no app-code changes.

Offline-capable URL imports for spark-html — a tiny service worker that caches CDN-imported components on first fetch and serves them when the network is gone. Zero dependencies.

Test helpers for spark-html: mount a component on linkedom, inspect its reactive scope, and fire realistic DOM events — no browser.

Dev server, build, and preview for spark-html apps — built entirely on Bun. Scoped component HMR over a plain WebSocket, import-map dev serving (no bundling in dev), Bun.build for the app shell, and an explicit post-build pipeline (prerender, image, font,

Subresource Integrity for spark-html — auto-hash built assets and components, verify at runtime, and make URL-imported components safe with an origin allow list + trust-on-first-use. Zero dependencies.

Local HTTPS for spark-html dev servers. One command fronts your spark-ssr or spark-html-bun dev/preview server with a self-signed TLS reverse proxy, so secure-context browser APIs (camera, mic, geolocation, service workers) work when you open the app on a