import type { FailureCategory, WorkerInboundMessage, WorkerOutboundMessage } from './types.ts';
import type { WorkerTurnWatchdog } from './worker-turn-watchdog.ts';
export interface WorkerProtocolFailure {
    failureCategory: FailureCategory;
    error: string;
    targetWorkflowId?: string;
    otherError: string;
}
export declare class WorkerProtocolGuard {
    #private;
    constructor(maxProtocolMessageBytes: number | undefined, requireProtocolVersion: boolean, turnWatchdog: WorkerTurnWatchdog);
    validateHostToWorkerMessage(message: WorkerInboundMessage): WorkerProtocolFailure | null;
    acceptWorkerMessage(worker: Worker, message: unknown): {
        accepted: true;
        message: WorkerOutboundMessage;
    } | {
        accepted: false;
        failure: WorkerProtocolFailure;
    };
}