A daemon for svelte-check that caches results for faster type checking
npm install @ampcode/svelte-check-daemonInstant svelte-check typechecking and diagnostics in SvelteKit projects, by using a daemon that monitors svelte-check --watch and returns the latest results when you run svelte-check-daemon check.
Add @ampcode/svelte-check-daemon as a dependency to your project:
``bash`
npm install --save-dev @ampcode/svelte-check-daemon-or-
pnpm add -D @ampcode/svelte-check-daemon
Then update your package.json scripts to run svelte-check-daemon start alongside your dev server and svelte-check-daemon check to get results:
`json`
{
"scripts": {
"dev": "concurrently \"svelte-check-daemon start --tsconfig tsconfig.json\" \"vite dev\"",
"check": "svelte-check-daemon check"
}
}
This uses concurrently to run both processes and ensure the daemon is properly terminated when you stop the dev server.
If the daemon isn't running, svelte-check-daemon check will just run svelte-check, which is a fallback in CI or if you've forgotten to run the daemon.
| Command | Description |
| ---------------------------- | ------------------------------------------------------------ |
| svelte-check-daemon start | Start the daemon (runs svelte-check --watch in background) |svelte-check-daemon check
| | Get the latest results from the daemon |svelte-check-daemon stop
| | Stop the running daemon |svelte-check-daemon status
| | Show daemon status |
| Option | Description |
| -------------------- | ---------------------------------------------- |
| --workspace | Path to workspace (default: current directory) |--tsconfig
| | Path to tsconfig.json |--help
| | Show help message |
| Signal | Description |
| -------- | --------------------------------------------------------------------------------------------------------------- |
| SIGHUP | Restarts svelte-check --watch. Useful when you want to force a full recheck without restarting the daemon. |
To force a restart: pkill -HUP svelte-check-daemon
Add this to your project's AGENTS.md to help AI agents work with the daemon:
`markdownpkill -HUP svelte-check-daemon
If svelte-check results seem stale, run to force a full recheck.`
| Variable | Description |
| --------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| SVELTE_CHECK_WATCH_BIG_CHANGES | Path to a directory (relative to cwd) to watch for deleted files. When a file is deleted in this directory, svelte-check --watch is restarted. Useful when svelte-check --watch gets out of sync after many file deletions. |NO_SVELTE_CHECK_DAEMON
| | Set to 1 to disable the daemon (the start command will exit immediately, which means checking will always run a full svelte-check and not use cached results). |VERBOSE` | Set to enable verbose logging. |
|