import type { BackendCapability } from "./backend-capability.js";
export type ProbeAllBackendCapabilities = () => Promise<BackendCapability[]>;
export type ProbeOneBackendCapability = (backend: string) => Promise<BackendCapability | undefined>;
/**
 * Keeps backend discovery responsive without making installation state permanent.
 * Refreshes are single-flight so all bot instances share one set of CLI probes.
 */
export declare class BackendCapabilityCache {
    private readonly probeAll;
    private readonly probeOne;
    private capabilities;
    private readonly capabilitiesByBackend;
    private refreshInFlight?;
    constructor(initial: BackendCapability[], probeAll: ProbeAllBackendCapabilities, probeOne: ProbeOneBackendCapability);
    snapshot(): BackendCapability[];
    get(backend: string): BackendCapability | undefined;
    availableBackends(): string[];
    refresh(): Promise<BackendCapability[]>;
    recheck(backend: string): Promise<BackendCapability | undefined>;
    private replace;
    private update;
}