import { Metric, MetricCategory, MetricsOutput } from './types.js';
export declare class MetricsCollector {
    private metrics;
    /**
     * Record a metric entry.
     *
     * @param category - The metric category (e.g., "hub-traversal")
     * @param data - The metric data (typed)
     */
    record<T extends Metric>(category: MetricCategory, data: T): void;
    /**
     * Record multiple metrics of the same category at once.
     * @param category
     * @param data
     */
    recordBatch<T extends Metric>(category: MetricCategory, data: T[]): void;
    /**
     * Get all metrics for a category.
     * @param category
     */
    get(category: MetricCategory): Metric[];
    /**
     * Get all metrics as a record.
     */
    getAll(): Record<MetricCategory, Metric[]>;
    /**
     * Clear all metrics (useful for testing).
     */
    clear(): void;
    /**
     * Check if any metrics have been collected.
     */
    isEmpty(): boolean;
    /**
     * Get count of metrics by category.
     * @param category
     */
    count(category?: MetricCategory): number;
    /**
     * Serialize to MetricsOutput format for JSON writing.
     */
    serialize(): MetricsOutput;
}
/**
 * Global singleton instance for convenience.
 * Can also create individual instances for isolation.
 */
export declare const metrics: MetricsCollector;
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