/**
 * Canonical HTTP-method resolution shared by in-process API execution,
 * isolated workers, method-not-allowed responses, and capability discovery.
 */
/** Standard methods advertised for a callable default route export. */
export declare const STANDARD_ROUTE_METHODS: readonly ["GET", "HEAD", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"];
/** Snapshot one request method as a bounded, canonical HTTP token. */
export declare function normalizeRouteMethod(method: unknown): string | null;
/**
 * Resolve the function an API request executes.
 *
 * Compatibility order is intentional: an exact method export wins, then the
 * default export, then GET supplies the conventional HEAD fallback.
 */
export declare function resolveRouteHandlerExport(routeModule: Record<string, unknown>, method: unknown): ((...args: unknown[]) => unknown) | undefined;
/**
 * Return the method surface the canonical resolver can execute.
 *
 * OPTIONS is always framework-reachable for a matched route. A default export
 * supports the standard surface plus the one bounded custom method currently
 * being probed (for example, a CORS PROPFIND preflight).
 */
export declare function resolveExecutableRouteMethods(routeModule: Record<string, unknown>, requestedMethod?: unknown, options?: {
    includeFrameworkOptions?: boolean;
}): string[];
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