/**
 * LocalEmbeddingService
 *
 * A zero-config, on-device embedder. It runs a small, pinned, CPU-only model
 * via the optional `@huggingface/transformers` package (Transformers.js +
 * onnxruntime) — no endpoint, no API key, no network beyond a one-time model
 * download that is cached on disk.
 *
 * It implements the same {@link Embedder} contract as the remote
 * `EmbeddingService`, so `VectorIndex` is agnostic to which one it was handed.
 *
 * The heavy dependency is loaded lazily, the first time `embed()` runs, and is
 * declared as an *optional* dependency: if it is not installed (or failed to
 * build on the platform), `embed()` throws a clear, actionable error instead of
 * breaking the build/install. The first-class keyword (BM25) index never depends
 * on it.
 */
import type { Embedder } from './embedding-service.js';
import type { EmbeddingConfig } from '../../types/index.js';
/**
 * Pinned default model: all-MiniLM-L6-v2 (~22M params, 384-dim), the standard
 * small, CPU-runnable sentence embedder. Pre-quantized ONNX weights (~23 MB) are
 * fetched once and cached. Pinned so results are reproducible across machines.
 */
export declare const DEFAULT_LOCAL_MODEL = "Xenova/all-MiniLM-L6-v2";
/** Where downloaded model weights are cached — shared across repositories. */
export declare const LOCAL_MODEL_CACHE_DIR: string;
export declare class LocalEmbeddingService implements Embedder {
    private readonly model;
    private readonly batchSize;
    /** Lazily-initialised, memoised extractor (model loads once per process). */
    private extractorPromise;
    /** Mirrors EmbeddingService: keep texts under the model's token window. */
    private static readonly MAX_CHARS_PER_TEXT;
    constructor(model?: string, batchSize?: number);
    static fromConfig(cfg: EmbeddingConfig): LocalEmbeddingService;
    /** `local:` prefix lets the served retrieval mode be derived from the sidecar. */
    get modelName(): string;
    private getExtractor;
    embed(texts: string[]): Promise<number[][]>;
}
//# sourceMappingURL=local-embedding-service.d.ts.map