import { Span } from './span';
import { SpanManager } from './span_manager';
export interface ZoneSpanOptions {
    /**
     * Name to give a created zone. Defaults to 'opentracing'.
     */
    zoneName?: string;
    /**
     * Key of Zone property. Defaults to 'opentracing'.
     */
    propertyKey?: string;
}
/**
 * SpanManager using {@link Zone.js|https://github.com/angular/zone.js}.
 *
 * The activated span is tied to the Zone. I.e. Zone#run affects which span is
 * active.
 */
export declare class ZoneSpanManager implements SpanManager {
    private readonly _propertyKey;
    private readonly _zoneName;
    constructor(options?: ZoneSpanOptions);
    active(): Span | null;
    activate<A>(span: Span | null, f: () => A): A;
}