import type { ReadableSpan } from '@opentelemetry/sdk-trace-base';
import { ConsoleSpanExporter } from '@opentelemetry/sdk-trace-base';
import type { Logger } from '@xylabs/logger';
/**
 * Calculates the duration of a span in milliseconds from its high-resolution time tuple.
 * @param span - The span to measure.
 * @returns The span duration in milliseconds.
 */
export declare function spanDurationInMillis(span: ReadableSpan): number;
/**
 * A console span exporter that formats spans with color-coded durations using chalk.
 * Spans are filtered by a configurable log level based on their duration.
 */
export declare class XyConsoleSpanExporter extends ConsoleSpanExporter {
    /** Duration thresholds (in ms) that map to increasing log levels. */
    static readonly durationToLogLevel: number[];
    /** Chalk color functions corresponding to each log level. */
    static readonly logLevelToChalkColor: import("chalk").ChalkInstance[];
    logger: Logger;
    private _logLevel;
    constructor(logLevel?: number, logger?: Logger);
    /** The minimum log level required for a span to be exported. */
    get logLevel(): number;
    export(spans: ReadableSpan[]): void;
    /**
     * Returns the chalk color function for the given log level.
     * @param level - The log level index.
     * @returns A chalk color function.
     */
    logColor(level: number): import("chalk").ChalkInstance;
    /**
     * Determines the log level of a span based on its duration.
     * @param span - The span to evaluate.
     * @returns The numeric log level (index into durationToLogLevel).
     */
    spanLevel(span: ReadableSpan): number;
}
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