import type { Attributes, GenerationEvent } from "../types.js";
/**
 * Build OTEL span attributes following the GenAI semantic conventions.
 * Langfuse auto-detects these as LLM generations.
 *
 * Maps {@link GenerationEvent} fields to standard `gen_ai.*` keys (model,
 * provider, token counts, stop reason) and Skaile-specific `skaile.generation.*`
 * keys (duration, cost, prompt preview). Only defined fields are included in
 * the returned map — undefined optional fields are omitted.
 *
 * @param gen - The generation event to convert to OTEL attributes.
 * @returns A flat {@link Attributes} map ready to pass to `otelSpan.setAttributes()`.
 * @see https://opentelemetry.io/docs/specs/semconv/gen-ai/
 * @docLink packages/telemetry/concepts#otel-telemetry-provider
 */
export declare function generationAttributes(gen: GenerationEvent): Attributes;
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