# Changelog

> True HMR for Lit components, CSS delivery helpers, and a DevTools timeline for Vite.

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## Version 0.20.0

Oct 18, 2026

The plugin now runs in Astro. `lit()` server-renders and hydrates Lit components with no other renderer, and `litDevtools()` brings hot patching and the Lit panel, opened from Astro’s dev toolbar. The Components tab reads hydration as a state and stops labelling other libraries’ elements. The DevTools now warn when the Lit Inspector extension and the plugin share a page, and both work there. Nothing needs action to upgrade.

### Added

* **The plugin runs in Astro, with the Lit panel in the dev toolbar.** Add `litDevtools()` from `@oddsquad/vite-plugin-lit/astro` to your integrations: Lit components hot-patch in place, hydrated or not, and the Lit logo in Astro’s dev toolbar opens the panel on the page you are on. `LIT_PLUGIN_TIMELINE=false` turns the panel off, and the `timeline` option wins over it.
* **Lit components render and hydrate in Astro with no other renderer.** `lit()` from `@oddsquad/vite-plugin-lit/astro` server-renders Lit components, hydrates them with their array and object props, keeps a `defer-hydration` you wrote until you remove it, and needs no hydrate imports in your pages. Components nested in another’s shadow root hydrate after a view transition too.
* **Resize the Lit window in Astro’s dev toolbar.** Drag the grip in its top corner to make it bigger or smaller; the size sticks across page loads, and a double click on the grip resets it. The window lines up with where the toolbar is docked.
* **The DevTools warn when two runtimes share a page.** With the Lit Inspector extension enabled on a dev server that already runs the plugin, the console and the Components tab now say that two runtimes are loaded and that the extension should be off for that site, instead of the picker silently doing nothing.

### Changed

* **Hydration state reads as a state.** A server-rendered component that has hydrated is now marked *hydrated* instead of *SSR*, and *deferred*, *not hydrated* and *hydrated* show as pills in the Components tree and details, with a drop icon that is empty until the element hydrates and filled once it has.
* **Custom elements from other libraries sit in the tree unmarked.** The muted *not Lit* chip is gone from their rows and the details head, so wrappers like Astro’s islands no longer crowd the tree with labels; the details pane still says why they have no properties.
* **A component that never upgraded shows one chip, not two.** One the server rendered was marked both *not upgraded* and *not hydrated*, as if hydration were still coming; it now carries only *not upgraded*, whose tooltip says it still shows the HTML the server sent.

### Fixed

* **The Lit Inspector extension works on a dev server that runs the plugin.** Enabled for such a site, Pick did nothing and threw in the console, and Vite DevTools lost the page. The extension’s runtime now serves the page and the plugin’s shares it, so both panels show the tree and Pick works from either.
* **The link printed with the DevTools code opens the Lit panel.** Without the Vite DevTools hub, the `#devframe_otp` link in the terminal opened your app instead of the panel at `/__lit/`, so you had to type the code; it now opens the panel, approved.
* **The Lit panel connects on StackBlitz without Vite DevTools.** In a WebContainer the panel the plugin serves at `/__lit/` used to be refused by its own socket and never show the page; it now admits StackBlitz’s origins.