/** Determine Content-Type from a file path extension */
export declare const getMimeType: (filePath: string) => string;
/** Upsert build outputs into the in-memory asset store.
 *  Evicts previous entries for the same logical asset (same base name,
 *  different hash) so stale paths don't accumulate. */
export declare const cleanStaleAssets: (store: Map<string, Uint8Array>, manifest: Record<string, string>, buildDir: string) => Promise<void>;
export declare const lookupAsset: (store: Map<string, Uint8Array>, path: string) => Uint8Array<ArrayBufferLike> | undefined;
export declare const populateAssetStore: (store: Map<string, Uint8Array>, manifest: Record<string, string>, buildDir: string) => Promise<void>;
