import { Readable } from "stream";
import { LogHandlerInterface } from "@pristine-ts/logging";
import { TracerInterface } from "../interfaces/tracer.interface";
import { ConsoleTracerOutputModeEnum } from "../enums/console-tracer-output-mode.enum";
/**
 * `ConsoleTracer` prints a completed trace to stdout when the trace ends. Its main purpose
 * is **developer-readable feedback during local development**: see what spans ran, in what
 * order, and which one was the bottleneck — without wiring up an external tracing backend.
 *
 * Off by default. Enable via `pristine.telemetry.console-tracer.activated = true` (or
 * `PRISTINE_TELEMETRY_CONSOLE_TRACER_ACTIVATED=true`). Three output modes:
 *   - `tree` (default): indented ASCII tree, durations right-aligned, slowest leaf flagged.
 *   - `json`: pretty-printed JSON dump.
 *   - `flat`: one line per span, no indentation, start-time-sorted.
 *
 * Crash-isolated: a throw inside the formatting code becomes a stderr line, never an
 * unhandled error or process crash.
 */
export declare class ConsoleTracer implements TracerInterface {
    private readonly activated;
    private readonly outputMode;
    private readonly minimumDurationMs;
    private readonly logHandler;
    traceEndedStream: Readable;
    constructor(activated: boolean, outputMode: ConsoleTracerOutputModeEnum, minimumDurationMs: number, logHandler: LogHandlerInterface);
    private handleTraceEnded;
    private reportFailure;
}