name: audit-loaders\nversion: 1.2.0\ndescription: |\nAudit pracht route loaders for serializability, leaked secrets, unsafe\nloaderCache, browser-only API use, and missing AbortSignal plumbing.\nUse for \"audit loaders\", \"check loader data\", \"find serialization bugs\", \"loader\nsecurity review\".\nallowed-tools:
Static analysis of every loader in the project. The framework serializes loader\nreturn values to the client via window.__PRACHT_STATE__, so anything returned\nends up in the browser — including secrets you never meant to expose.
MCP: when the pracht MCP server is registered (pracht dev-mcp), prefer its\ninspect_routes/inspect_api/inspect_build/doctor/verify tools over\nshelling out.
pracht inspect routes --json\nPrerequisite: pracht inspect needs a vite config with the pracht plugin\nwired up.
For every route entry, read loaderFile ?? file and inspect the loader\nexport there. Loaders may live in a separate data module wired via the\nmanifest (RouteConfig.loader); the inspect JSON surfaces that as\nloaderFile (null when the loader lives in the route module itself). Reading\nonly file misses every externalized loader.
Shells can export a loader too. Read each distinct shellFile from the same\nJSON and audit its loader like a route's: its return value reaches the\nbrowser as shellData on every page under that shell.
For each loader (and getStaticPaths when present):
Skip this check for hydration: \"islands\" and \"none\" routes: they ship no\nloader data. Otherwise, check vite.config.* for\npracht({ client: { richData: true } }) first.
Without richData (the default), loader data is JSON.stringify'd while the\ncomponent's types still promise the original. Flag returns that contain any of:
| Construct | \nWhy it breaks | \n
|---|---|
Date, Map, Set, URL | \nNot preserved by JSON.stringify | \n
| Class instances | \nLose prototype on the client | \n
Function / arrow values | \nStripped silently | \n
Promise (bare) | \nBecomes {} — wrap in defer() | \n
| Circular refs | \nThrows at serialize time | \n
Buffer / typed arrays | \nBecomes {} or numeric keys | \n
bigint | \nJSON.stringify throws | \n
undefined in arrays/object | \nDrops keys; arrays become null | \n
With richData, Date, Map, Set, URL, RegExp, bigint, undefined,\nand shared or circular references arrive intact: do not flag them. Flag\nfunctions, symbols, typed arrays, and class instances without toJSON()\n(Error included) instead: each fails the request with a 500 naming the path,\nin production too. A class instance with toJSON() arrives as its output, so\nits type lies.
A bare promise in loader data is always a bug — it serializes to {}. The fix\nis defer(promise), which marks the field as deferred and is read in the\ncomponent with use() inside a <Suspense> boundary. Flag a bare promise as an\nerror and point at defer(); a defer()ed field is correct and must not be\nflagged.
Two defer() rules worth checking while you are in the loader:
PrachtHttpError, or set response\nstatus or headers — by the time it settles the response is already committed.\nAuth belongs in middleware or the awaited part of the loader.defer(await …) defeats the point and throws at runtime. Flag it.defer() must be returned from an enumerable data property, not hidden\nbehind a getter. An unresolved marker throws during serialization.Recommend converting to string (ISO for dates), plain arrays, or plain objects\nbefore return, or turning on client.richData when an app returns many dates\nor maps.
Ownership note: deep secret scanning is owned by /audit-secrets and by\npracht verify's env scan — keep this check brief and point the user there\nrather than triple-reporting the same findings. Here, only flag what falls\nout of reading the return value anyway:
Grep the loader body and anything it returns for:
\nprocess.env.* references that flow into the return value.context.env.* (Cloudflare bindings) flowing into the return value.*SECRET*, *TOKEN*, *KEY*, *PASSWORD*, *PRIVATE*,\n*API_KEY* reaching the return.password_hash, mfa_secret, etc.Loaders run server-side but the return value crosses the wire. Always\nproject to a smaller shape before returning.
\nFlag any of these accessed unconditionally inside loader or at the top level\nof a route module that is rendered SSR/SSG/ISG:
window, document, navigator, localStorage, sessionStorage,\nIntersectionObserver, matchMedia, requestAnimationFrame.These crash on the server. For SPA-only routes (render: \"spa\") it's fine\ninside the component — but never inside loader.
For loaders that call fetch or any I/O:
signal in LoaderArgs.fetch(url, { signal }) calls and to any\ndatabase client that accepts cancellation.signal keeps work running after the client navigates\naway, and holds the response past loaderTimeoutMs. Where a driver cannot\ntake a signal, suggest defineApp({ enforceLoaderTimeout: true }) so the\nresponse still answers when the budget runs out.For routes with a positive loaderCache value, flag loader data whose freshness\nor visibility depends on cookies, authorization headers, sessions, user identity,\npermissions, or request-specific context. Route-state HTTP caching is private,\nso shared proxies cannot reuse it, but a stale response can still survive logout,\naccount switching, or permission changes in the same browser.
Recommend loaderCache: false/0 for personalized or authorization-sensitive\nloaders. Use a positive duration only when every field in the returned data can be\nsafely reused for that long. Do not confuse loaderCache with ISG revalidate or\nthe short-lived in-memory prefetch cache; they are independent policies.
Produce a markdown table:
\n| Route | \nFile | \nSeverity | \nFinding | \nSuggested fix | \n
|---|
Severities: error (secret leak, crash), warn (serialization risk, missing\nsignal), info (style nit).
pracht inspect routes --json as the source of truth — do not glob\nsrc/routes/** and risk missing manifest wiring or catching orphan files.select or projection step rather than spreading the row.$ARGUMENTS
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