/**
 * Convenience: build the optional EnhancedFactStore + knowledge-graph worker
 * config from the canonical `HORIZON_*` environment variables.
 *
 * The `PilotSwarmWorker` intentionally does NOT read `process.env` itself — app
 * entrypoints own env parsing and pass explicit config. This helper exists so the
 * shipped CLI/portal embedded worker, the standalone K8s worker, and the examples
 * all map the same env vars to the same worker fields, with no drift.
 *
 * Returns an EMPTY object when none of the `HORIZON_*` vars are set (the default —
 * plain `PgFactStore`, no enhanced provider, no graph). The enhanced facts store and
 * the knowledge graph are INDEPENDENT axes: setting only `HORIZON_GRAPH_DATABASE_URL`
 * yields a graph over the base fact store (graph tools, no search). Spread the result
 * into the worker options:
 *
 * ```ts
 * const worker = new PilotSwarmWorker({
 *     store: process.env.DATABASE_URL,
 *     githubToken: process.env.GITHUB_TOKEN,
 *     ...horizonConfigFromEnv(),
 * });
 * ```
 *
 * Env vars (all optional except the database URL):
 *   HORIZON_DATABASE_URL        → enhancedFactsDatabaseUrl (enables the enhanced
 *                                 provider; worker infers factsProvider="horizon")
 *   HORIZON_FACTS_SCHEMA        → enhancedFactsSchema (default "horizon_facts")
 *   HORIZON_GRAPH_DATABASE_URL  → graphDatabaseUrl (opt-in graph; unset ⇒ no graph)
 *   HORIZON_GRAPH_SCHEMA        → graphSchema (default "horizon_graph")
 *   HORIZON_GRAPH_REGISTRY_SCHEMA → graphRegistrySchema (default
 *                                 `${graphSchema}_registry`; MUST differ from graphSchema)
 *   HORIZON_NAMESPACE_CACHE_TTL_MS → graphNamespaceCacheTtlMs (default 60000; 0 disables cache)
 *   HORIZON_EMBED_URL/MODEL/DIM → horizonEmbed (durable embedder; all three
 *                                 required, else the embedder is omitted and
 *                                 search runs lexical-only)
 *   HORIZON_EMBED_API_KEY       → horizonEmbed.apiKey
 *   HORIZON_EMBED_API_KEY_HEADER→ horizonEmbed.apiKeyHeader (default "api-key")
 *   HORIZON_EMBED_BEARER        → horizonEmbed.bearer (sends "Bearer <key>");
 *                                 inferred true when the header is "Authorization"
 *
 * @module
 */
import type { EmbeddingEndpointConfig } from "./facts-store.js";
/** The subset of `PilotSwarmWorkerOptions` that the `HORIZON_*` env vars map to. */
export interface HorizonEnvConfig {
    enhancedFactsDatabaseUrl?: string;
    enhancedFactsSchema?: string;
    horizonEmbed?: EmbeddingEndpointConfig;
    graphDatabaseUrl?: string;
    graphSchema?: string;
    graphRegistrySchema?: string;
    graphNamespaceCacheTtlMs?: number;
}
/**
 * Map the `HORIZON_*` environment variables to the worker's enhanced-facts /
 * knowledge-graph config. Pure and side-effect-free; safe to call at startup.
 *
 * @param env - Environment source (defaults to `process.env`).
 */
export declare function horizonConfigFromEnv(env?: Record<string, string | undefined>): HorizonEnvConfig;
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