import type { FitProbeRequest, FitProbeResult } from './engine-fit.js';
/**
 * One JSON line in, one JSON line out. The child holds a native addon for the
 * duration of the call, so the boundary stays deliberately narrow: nothing
 * streams, nothing is stateful, and a child that dies mid-call costs only the
 * projection.
 */
export declare const FIT_PROCESS_PROTOCOL_VERSION = 1;
export declare const FIT_PROCESS_MAX_REQUEST_BYTES: number;
export declare const FIT_PROCESS_MAX_RESPONSE_BYTES: number;
export interface FitProcessRequest {
    version: number;
    probe: FitProbeRequest;
}
export type FitProcessResponse = {
    status: 'completed';
    probe: FitProbeResult;
} | {
    status: 'invocation-error';
    error: {
        name: string;
        message: string;
    };
};
export declare function encodeFitProcessRequest(probe: FitProbeRequest): string;
export declare function parseFitProcessRequest(value: unknown): FitProcessRequest;
export declare function parseFitProcessResponse(value: unknown): FitProcessResponse;