import { AxPlatform, AxSnapshot } from './ax-tree';
export type AxStatus = 'idle' | 'starting' | 'ready' | 'unavailable' | 'error';
export type AxFetcherSendFn = (payload: Record<string, unknown>) => boolean;
export interface AxFetcherOptions {
    platform: AxPlatform;
    send: AxFetcherSendFn;
    onSnapshot: (snapshot: AxSnapshot | null) => void;
    onStatusChange?: (status: AxStatus, error?: string) => void;
    baseIntervalMs?: number;
    maxBackoffMs?: number;
}
export declare class AxFetcher {
    private readonly platform;
    private readonly send;
    private readonly onSnapshot;
    private readonly onStatusChange?;
    private readonly baseIntervalMs;
    private readonly maxBackoffMs;
    private readonly pending;
    private running;
    private timer;
    private currentInterval;
    private lastSnapshot;
    private inflight;
    private lastBumpAtMs;
    private boostUntilMs;
    private status;
    constructor(opts: AxFetcherOptions);
    start(): void;
    stop(): void;
    getStatus(): AxStatus;
    private setStatus;
    bumpActivity(): void;
    refresh(): Promise<AxSnapshot>;
    getLatest(): AxSnapshot | null;
    handleMessage(message: {
        type?: string;
        id?: string;
        [k: string]: unknown;
    }): boolean;
    private buildRequest;
    private requestOnce;
    private runOnce;
    private deliver;
    private scheduleNext;
    private settleResolve;
    private settleReject;
    private failAllPending;
}