/**
 * Reads an MCP App bundle, serving it from memory once it has been read.
 *
 * Each app ships as one inlined HTML file, so a read hands over the whole
 * bundle: around 0.7 MB for a map app, which loads MapLibre from a CDN.
 * That file only changes when `build:apps` runs, so re-reading and re-decoding
 * it on every render is pure overhead.
 *
 * Validated against mtime and size rather than cached outright, which keeps a
 * rebuild visible to an already-running server: the `pnpm ui` loop rebuilds the
 * apps under a server started from `dist`, and a blind cache would serve the
 * previous bundle until restart. A `stat` costs about a hundredth of what
 * reading the file costs, so the check is close to free.
 *
 * Only successful reads are cached, so a server started before `build:apps` ran
 * fails each app read until the apps exist, then serves them without a restart.
 *
 * @param htmlPath - Absolute path to the app's `app.html`
 * @returns The bundle's contents
 * @throws If the file cannot be stat'd or read
 */
export declare function readAppHtml(htmlPath: string): Promise<string>;
//# sourceMappingURL=appHtmlCache.d.ts.map