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vite-plugin-lit

Changelog

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Version 0.3.0

The DevTools half of the plugin was rebuilt on devframe, and most of what follows falls out of that: the panel is no longer tied to Vite DevTools, and the same data it shows is reachable by a coding agent over MCP.

Added

  • The panel runs on devframe. The bespoke transport is gone. The panel works docked in Vite DevTools, in its own tab, or standalone from the CLI.
  • lit-devtools CLI. lit-devtools dev serves the panel without a Vite dev server of its own; lit-devtools mcp exposes the panel’s data to an MCP client over stdio, discovering a running dev server on its own.
  • MCP tools for agents — list the component tree, read recent timeline events, start and stop a recording, and read why a module fell back to a full reload instead of a hot patch.
  • Updates tab. The timeline reads as an explainer for a single update: what changed, which components re-rendered, and what it cost.
  • Session export. A recorded session can be written out as a static copy of the panel — shareable, no dev server needed to open it.
  • Deep links. Panel views are addressable, so a link opens the tab, the selected element, or an exported snapshot at the right place.
  • Flash on update. An opt-in fading outline over every element that finishes an update, with an optional ramp colouring it by updates per second.
  • Ambient types for virtual:lit-plugin/timeline, shipped in @oddsquad/vite-plugin-lit/client alongside the CSS query declarations. Following the custom-layers guide no longer means silencing TS2307.
  • Documentation site at https://oddcelot.github.io/vite-plugin-lit/, and a CI workflow that type checks, lints, tests and builds every push.

Changed

  • Panel settings persist per developer through devframe’s settings store instead of per browser, so they follow you across browsers and survive clearing site data. localStorage stays as the page’s boot-time cache.
  • Source links open through the shared open-in-editor service and resolve against the Vite root.
  • The docked panel draws its hover outline over a direct page channel rather than routing through the dev server.
  • Tooling moved to Vite+ (oxfmt, oxlint, tsgolint); dependencies updated to TypeScript 7, Vite 8.3, es-module-lexer 3 and magic-string 1.
  • The README is a front door now; the long-form guides live on the docs site.

Fixed

  • virtual:lit-plugin/timeline broke vite build. Both hooks lived on the serve-only plugin, so nothing claimed the specifier during a build and the bundler failed on a module the developer never wrote. It now resolves in dev and build alike, stubbing itself out in any build.
  • The dev-server endpoints reject cross-site requests.
  • Source metadata is injected in the component class’s own scope, so it can no longer reference a class that isn’t in scope.
  • The DevTools element watch survives a hot patch; updated() is resolved lazily rather than captured once.
  • Recording state is synced to a page runtime when it connects, so a reload mid-recording keeps recording.
  • recent-events works when called with no arguments, and the documented MCP endpoint path matches the one the server serves.