/**
 * Isolation wrapper around @huggingface/transformers for local vector embeddings.
 * Dynamic import — never loaded if the package is not installed.
 */
export declare class Embedder {
    /** Check if @huggingface/transformers is importable (caches result) */
    static isAvailable(): Promise<boolean>;
    /** Embed text into a Float32Array(768) or null if unavailable */
    static embed(text: string): Promise<Float32Array | null>;
    /** Embed a search query (adds "search_query: " prefix for nomic-embed) */
    static embedQuery(text: string): Promise<Float32Array | null>;
    /** Serialize Float32Array to Buffer (3072 bytes for 768 dims) */
    static toBuffer(embedding: Float32Array): Buffer;
    /** Deserialize Buffer back to Float32Array */
    static fromBuffer(buf: Buffer): Float32Array;
    /** Cosine similarity between two vectors. Returns [-1, 1]. */
    static cosineSimilarity(a: Float32Array, b: Float32Array): number;
    /** Reset cached state (for tests) */
    static _reset(): void;
}
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