Requirements

Svelte TV apps are built on Svelte 5 and LightningJS v3. They run in a JavaScript engine that supports modern ES2015 features used by the framework and renderer.

Minimum Browser Engine

The minimum supported browser engine is Chrome 49, or another browser engine with equivalent JavaScript Proxy support.

Proxy is required by modern reactive JavaScript libraries and cannot be fully polyfilled for older engines. If a target TV browser does not support new Proxy(target, handler), it should be treated as unsupported.

References:

• MDN: Proxy browser compatibility
• Chrome for Developers: ES2015 Proxies in Chrome 49 and later
• Can I Use: JavaScript Proxy support

Framework Requirements

Svelte TV depends on:

• Svelte 5 for the component and reactivity model
• LightningJS v3 for the TV renderer
• a browser runtime with ES2015 Proxy support
• WebGL support for rendering

Target Devices

Before shipping to a TV platform, verify the actual embedded browser version on the device. Some TV operating systems use Chromium-based engines but ship older runtime versions than desktop browsers.

If the engine is Chrome 49 or newer, or matches Chrome 49's Proxy support level, it meets the minimum JavaScript requirement.