/** The config file the running gateway watches; edits are hot-reloaded within ~1s. */
export declare const GATEWAY_CONFIG_PATH: string;
export interface GatewayRouteSpec {
    /** Endpoint section (URL segment after the mode): `/m/<mode>/<endpoint>`. */
    endpoint: string;
    /** Mode name (billing/route selector). */
    mode: string;
    base_url: string;
    auth_style: string;
    /** Managed upstream keys. Empty means the gateway forwards the caller's own key. */
    keys: string[];
    passthrough: boolean;
}
/** The stored route config, or null when that endpoint/mode pair is absent. */
export declare function readGatewayRoute(gatewayPath: string, endpoint: string, mode: string): Record<string, unknown> | null;
/**
 * Write one route, replacing it if it already exists. This is the update path the discovery merge
 * deliberately lacks — `mergeGatewayConfig` is add-only so it can never clobber hand-maintained
 * routes, which also means it can never edit one.
 */
export declare function upsertGatewayRoute(gatewayPath: string, route: GatewayRouteSpec): void;
/** Remove one route, dropping the endpoint section once its last mode is gone. */
export declare function removeGatewayRoute(gatewayPath: string, endpoint: string, mode: string): boolean;