import { GbnfJsonDefList, GbnfJsonSchema, GbnfJsonSchemaToType } from "../../../utils/gbnfJson/types.js";
import { ChatSessionModelFunction } from "../../../types.js";
/**
 * Define a function that can be used by the model in a chat session, and return it.
 *
 * This is a helper function to facilitate defining functions with full TypeScript type information.
 *
 * The handler function can return a Promise, and the return value will be awaited before being returned to the model.
 * @param functionDefinition
 */
export declare function defineChatSessionFunction<const Params extends GbnfJsonSchema<Defs>, const Defs extends GbnfJsonDefList<Defs>>({ description, params, handler }: {
    description?: string;
    params?: Readonly<Params> & GbnfJsonSchema<Defs>;
    handler: (params: GbnfJsonSchemaToType<NoInfer<Params>>) => Promise<any> | any;
}): ChatSessionModelFunction<NoInfer<Params>>;