export type DependencyName = 'redisCommand' | 'redisPubSub' | 'postgres';
export type DependencyState = 'starting' | 'healthy' | 'reconnecting' | 'unhealthy';
export type DependencyErrorKind = 'connection_refused' | 'connection_reset' | 'timeout' | 'dns' | 'authentication' | 'connection_closed' | 'unavailable';
export interface DependencyObservation {
    dependency: DependencyName;
    state: Exclude<DependencyState, 'starting'>;
    errorKind?: DependencyErrorKind;
    attempt?: number;
    nextRetryMs?: number;
}
export interface DependencyObserver {
    observe(observation: DependencyObservation): void;
}
export declare class DependencyUnavailableError extends Error {
    readonly dependency: DependencyName;
    readonly kind: DependencyErrorKind;
    readonly cause: unknown;
    constructor(dependency: DependencyName, kind: DependencyErrorKind, cause?: unknown);
}
export declare function findDependencyUnavailableError(value: unknown): DependencyUnavailableError | undefined;
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