export declare class Embedder {
    private static instances;
    private readonly twiningDir;
    private pipeline;
    private fallbackMode;
    private initPromise;
    constructor(twiningDir: string);
    /** Get or create a singleton instance for a given twiningDir. */
    static getInstance(twiningDir: string): Embedder;
    /** Reset singleton instances (for testing). */
    static resetInstances(): void;
    /** Generate a 384-dimensional embedding for the given text. Returns null if in fallback mode. */
    embed(text: string): Promise<number[] | null>;
    /** Generate embeddings for multiple texts. Returns null for any that fail. */
    embedBatch(texts: string[]): Promise<(number[] | null)[]>;
    /** Whether the embedder has fallen back to keyword-only mode. */
    isFallbackMode(): boolean;
    /** Whether the pipeline has been initialized (for testing). */
    isInitialized(): boolean;
    /** Initialize the ONNX pipeline. Called lazily on first embed(). */
    private initialize;
    private doInitialize;
}
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