import Span from './Span';
export interface QueueState {
    traces: Span[];
    isFlushing: boolean;
    lastFlush: string | null;
}
export declare type Span = typeof Span;
export interface SpanMeta {
    [key: string]: string;
}
export interface SpanTags {
    [key: string]: string;
}
export declare type FlushFunction = (traces: Span[]) => any;
export interface Logger {
    info(...args: any[]): void;
    warn(...args: any[]): void;
    error(...args: any[]): void;
}
export interface AbstractReporter {
    reportTrace(trace: Span): any;
}
export interface TracerConfiguration {
    minimumDurationMs?: number;
    sampleRate?: number;
    globalMetadata?: {
        [key: string]: string;
    } | Function;
    globalTags?: {
        [key: string]: string;
    } | Function;
    reporter: AbstractReporter;
    traceId?: number;
}
export interface ReporterConfiguration {
    maxTracesBatchSize?: number;
    flushIntervalSeconds?: number;
    logger?: Logger;
    flushHandler?: FlushFunction;
}