export interface BrokerSupervisorConfig {
    /** argv for the broker. command[0] must be an absolute path to an executable. */
    command?: string[];
}
/** True when the broker answers /health. Never throws. */
export declare function isBrokerHealthy(timeoutMs?: number): Promise<boolean>;
/**
 * Why a configured command cannot be used, or null when it can. Absolute paths
 * only, for the same reason as extensions.allow: a bare name would be resolved
 * against whatever PATH launchd handed the daemon, which is not the user's.
 */
export declare function validateBrokerCommand(command: unknown): string | null;
/**
 * Keep the broker up. Returns a stop function that ends supervision; it
 * deliberately leaves a running broker running (see header).
 */
export declare function startBrokerSupervisor(config: BrokerSupervisorConfig | undefined, opts?: {
    checkMs?: number;
    logDir?: string;
}): () => void;
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