import { Context } from '../context/types';
import { ProxyTracerProvider } from './ProxyTracerProvider';
import { Span } from './span';
import { SpanOptions } from './SpanOptions';
import { Tracer } from './tracer';
/**
 * Proxy tracer provided by the proxy tracer provider
 */
export declare class ProxyTracer implements Tracer {
    private _provider;
    readonly name: string;
    readonly version?: string | undefined;
    private _delegate?;
    constructor(_provider: ProxyTracerProvider, name: string, version?: string | undefined);
    startSpan(name: string, options?: SpanOptions, context?: Context): Span;
    /**
     * Try to get a tracer from the proxy tracer provider.
     * If the proxy tracer provider has no delegate, return a noop tracer.
     */
    private _getTracer;
}