/**
 * Thrown when a write-mode graph RPC cannot complete because the leader has
 * gone away (e.g. lockfile lost, socket closed, heartbeat timeout). The
 * caller is expected to surface this to the user — writes are not silently
 * retried across a failover because their effect on the DB is not known.
 */
export declare class LeaderLostError extends Error {
    readonly method: string;
    constructor(method: string, cause?: Error);
}
export declare function isTransportFailure(err: unknown): boolean;
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