import type { DataPoint } from '@ya-modbus/driver-types';
/**
 * Metadata for JSON output
 */
export interface JSONMetadata {
    /** Driver package name */
    driver?: string | undefined;
    /** Connection details */
    connection?: {
        port?: string | undefined;
        host?: string | undefined;
        slaveId?: number | undefined;
    } | undefined;
    /** Performance metrics */
    performance?: {
        responseTimeMs: number;
        operations: number;
        errors: number;
    } | undefined;
}
/**
 * Format data point results as JSON
 *
 * @param dataPoints - Data point definitions
 * @param values - Data point values (keyed by ID)
 * @param metadata - Additional metadata to include
 * @returns Formatted JSON string with 2-space indentation
 */
export declare function formatJSON(dataPoints: ReadonlyArray<DataPoint>, values: Record<string, unknown>, metadata: JSONMetadata): string;
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