import { type ConnectionServiceClient } from '@cratis/chronicle.contracts';
import { type ClientMiddleware } from 'nice-grpc-common';
/** Verifies the installed wire contract before a channel can perform event-sequence operations. */
export declare class CompatibilityPreflight {
    private readonly _connections;
    private readonly _timeout;
    private _verification?;
    constructor(_connections: ConnectionServiceClient, _timeout: number);
    /** Shares in-flight checks and caches verdicts for this channel; transient failures can be retried. */
    verify(): Promise<void>;
    /** Gates even direct service calls that did not first call connect(). */
    middleware(): ClientMiddleware;
    private check;
}
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