/**
 * LlmModulePlugin
 *
 * Detects and loads the `llm_module` configuration from `metaschema_modules_public.llm_module`.
 * Makes the resolved embedder and chat completer available to other plugins
 * via the build context.
 *
 * This plugin is the foundation that enables per-database LLM configuration.
 * When an API has an `llm_module` configured, the embedder is resolved and
 * stored on the build object for other plugins (text search, text mutations)
 * to consume.
 *
 * Resolution order for the embedder:
 *   1. `defaultEmbedder` from preset options (build-time)
 *   2. Environment variables (EMBEDDER_PROVIDER, EMBEDDER_MODEL, EMBEDDER_BASE_URL)
 *   3. null — LLM features are disabled
 *
 * Per-database model/baseUrl overrides (from `llm_module` via `ctx.useLlm()`)
 * are applied at request time via `llmConfigStore` (AsyncLocalStorage) in
 * the text-search-plugin resolver wrapper. The same embedder function — and
 * its metering wrapper — handles every request; only the model name and
 * base URL parameters change per-tenant.
 *
 * This plugin is intentionally pure — no billing or metering logic.
 * The optional LlmMeteringPlugin wraps the embedder with billing integration
 * if loaded (it runs after this plugin and before the consumer plugins).
 */
import type { GraphileConfig } from 'graphile-config';
import type { ChatFunction, EmbedderFunction, GraphileLlmOptions } from '../types';
declare global {
    namespace GraphileBuild {
        interface Build {
            /** The resolved embedder function, or null if LLM is not configured */
            llmEmbedder: EmbedderFunction | null;
            /** The resolved chat completion function, or null if not configured */
            llmChatCompleter: ChatFunction | null;
            /** The embedding model name (used as billing meter slug) */
            llmEmbeddingModel: string | null;
            /** The chat model name (used as billing meter slug) */
            llmChatModel: string | null;
        }
    }
    namespace GraphileConfig {
        interface Plugins {
            LlmModulePlugin: true;
        }
    }
}
/**
 * Creates the LlmModulePlugin with the given options.
 */
export declare function createLlmModulePlugin(options?: GraphileLlmOptions): GraphileConfig.Plugin;