import type { TelemetryConfig } from "../types.js";
/**
 * Create an OTLP/HTTP trace exporter configured for the given endpoint.
 * Lazy-loads `@opentelemetry/exporter-trace-otlp-http` so the module is never
 * imported when `provider: "none"`.
 *
 * When both `config.auth` and `config.secretKey` are present, a Basic
 * Authorization header is constructed (base-64 encoded `auth:secretKey`),
 * which is the format expected by Langfuse's OTLP ingestion endpoint.
 *
 * @param config - The resolved {@link TelemetryConfig}. `config.endpoint` must
 *   be set (callers gate on this before calling).
 * @returns A configured `OTLPTraceExporter` instance.
 * @docLink packages/telemetry/concepts#otel-telemetry-provider
 */
export declare function createOtlpExporter(config: TelemetryConfig): Promise<import("@opentelemetry/exporter-trace-otlp-http").OTLPTraceExporter>;
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