/**
 * Tracer events form a graph.
 */
export type Event = {
    id: string;
    timestamp: number;
    duration?: number;
    value?: any;
};
/**
 * Event sink.
 */
export declare class Tracer {
    private readonly _events;
    private _recording;
    get recording(): boolean;
    keys(): string[];
    get(id: string, filter?: Record<string, any>): Event[] | undefined;
    clear(): void;
    start(): this;
    stop(): this;
    emit(id: string, value?: any): void;
    mark(id: string, value?: any): {
        start: number;
        end: () => void;
    };
    private _createEvent;
    private _post;
}
export declare const tracer: Tracer;
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