export type BreakerState = "closed" | "open" | "half-open";
export type AllowResult = {
    allowed: boolean;
    reason: string;
    state: BreakerState;
    probeToken?: number;
};
export type TransportBreakerSnapshot = {
    entries: number;
    closed: number;
    open: number;
    halfOpen: number;
    trips: number;
    halfOpenProbes: number;
    closes: number;
};
export type TransportBreakerOptions = {
    windowMs?: number;
    minSamples?: number;
    failurePercent?: number;
    openMs?: number;
    jitterMs?: number;
    maxEntries?: number;
    ttlMs?: number;
    halfOpenSuccesses?: number;
    enabled?: boolean;
    now?: () => number;
    random?: () => number;
};
export type TransportBreaker = {
    allow: (key: string) => AllowResult;
    recordSuccess: (key: string, token?: number) => void;
    recordFailure: (key: string, detail: {
        eligible: boolean;
        token?: number;
    }) => void;
    snapshot: () => TransportBreakerSnapshot;
    sweep: () => void;
};
export declare function createTransportBreaker(opts?: TransportBreakerOptions): TransportBreaker;
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