import { type Tracer, type Span, type SpanOptions } from './tracer';
/**
 * No-op tracer implementation
 * Provides zero overhead when tracing is disabled (default)
 */
export declare class NoOpTracer implements Tracer {
    private traceId;
    private spanCounter;
    private onSpanCreated?;
    constructor(onSpanCreated?: (span: Span) => void);
    private generateTraceId;
    private generateSpanId;
    startSpan(name: string, options?: SpanOptions): Span;
    getActiveSpan(): Span | undefined;
    setActiveSpan(span: Span | undefined): void;
    getTraceId(): string | undefined;
    /**
     * Reset the trace ID (useful for testing)
     */
    resetTraceId(): void;
}
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