/**
 * A dependency-free OTLP/HTTP (JSON) span exporter. Ships completed spans to any OpenTelemetry
 * collector (`.../v1/traces`) with in-process batching, matching the package's no-SDK stance: it
 * speaks the wire protocol directly over `fetch`, so it runs on Bun, Node, Deno, and workerd alike.
 *
 * Wire mapping follows the OTLP/JSON encoding: ids stay hex, times become Unix-nanosecond strings,
 * attributes become typed `KeyValue`s. Export is fail-open (a collector outage never throws into a
 * request); delivery failures reach `onError`.
 */
import type { ObservationAdapter } from "./span.js";
export interface OtlpExporterOptions {
    /** The collector's traces endpoint, e.g. `http://localhost:4318/v1/traces`. */
    readonly url: string;
    /** Extra headers on every export (auth tokens, tenant ids). */
    readonly headers?: Record<string, string>;
    /** `service.name` resource attribute. Default `"nifra"`. */
    readonly serviceName?: string;
    /** Batching knobs. */
    readonly batch?: {
        /** Flush once this many spans are queued. Must be a positive safe integer. Default 512. */
        readonly maxBatch?: number;
        /** Hard cap on the queue; oldest spans are dropped past it. Positive safe integer; default 2048. */
        readonly maxQueue?: number;
        /** Periodic flush interval (ms). Must be a positive safe integer. Default 5000. */
        readonly flushIntervalMs?: number;
    };
    /** Called when an export POST fails or spans are dropped. Fail-open: never throws into a request. */
    readonly onError?: (error: unknown) => void;
    /** Override `fetch` (tests, a proxy agent). Defaults to the global. */
    readonly fetch?: (input: string, init: RequestInit) => Promise<{
        ok: boolean;
        status: number;
    }>;
}
export interface OtlpExporter extends ObservationAdapter {
    /** Send everything queued now. Await it in a graceful shutdown so no span is lost. */
    flush(): Promise<void>;
    /** Stop the periodic timer and flush a final time. Call on server stop. */
    shutdown(): Promise<void>;
}
export declare function otlpExporter(options: OtlpExporterOptions): OtlpExporter;
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