import type { TraceContext, TracingOptions } from './types';
export declare class Tracer {
    private context;
    private activeSpans;
    constructor();
    /**
     * Start a new trace span
     */
    startSpan(options: TracingOptions): TraceContext;
    /**
     * Finish a trace span
     */
    finishSpan(spanId: string): number | undefined;
    /**
     * Execute a function within a trace span
     */
    trace<T>(options: TracingOptions, fn: () => T | Promise<T>): Promise<T>;
    /**
     * Add metadata to current span
     */
    addMetadata(key: string, value: unknown): void;
    /**
     * Add tags to current span
     */
    addTags(...tags: string[]): void;
    /**
     * Get current trace context
     */
    getCurrentTrace(): TraceContext | undefined;
    /**
     * Get all active spans
     */
    getActiveSpans(): TraceContext[];
    /**
     * Find a span by ID
     */
    findSpanById(spanId: string): TraceContext | undefined;
    /**
     * Generate a unique trace ID
     */
    private generateTraceId;
    /**
     * Generate a unique span ID
     */
    private generateSpanId;
}