import type { LanguageModel } from "./language-model.ts";
import type { LanguageModelInput, ModelResponse, ModelUsage, PartialModelResponse } from "./types.ts";
export declare class LMSpan {
    #private;
    provider: string;
    model_id: string;
    method: "generate" | "stream";
    usage: ModelUsage | null;
    cost: number | null;
    start_time: Date;
    /**
     * Time to first token, in seconds
     */
    time_to_first_token: number | undefined;
    max_tokens?: number;
    temperature?: number;
    top_p?: number;
    top_k?: number;
    presence_penalty?: number;
    frequency_penalty?: number;
    seed?: number;
    constructor(provider: string, modelId: string, method: "generate" | "stream", input: LanguageModelInput);
    onStreamPartial(partial: PartialModelResponse): void;
    onResponse(response: ModelResponse): void;
    onEnd(): void;
    onError(error: unknown): void;
}
export declare function traceLanguageModel(self: LanguageModel): void;