/**
 * BGE Embedder — persistent Python child process for embedding.
 *
 * Spawns bge-embed.py once, communicates via stdin/stdout JSON lines.
 * Model loads once at startup; all subsequent embed calls reuse the same process.
 * Uses BAAI/bge-small-zh-v1.5 (512 dimensions).
 *
 * Implements EmbeddingProvider interface for seamless integration.
 */
import type { EmbeddingProvider } from '../embedding/embedding-provider.js';
export declare class BgeEmbedder implements EmbeddingProvider {
    private readonly pythonScript;
    private proc;
    private rl;
    private ready;
    private pendingResolve;
    private pendingReject;
    private closed;
    constructor(customScriptPath?: string);
    /**
     * Start the Python process and wait for the "ready" signal.
     * Idempotent — only spawns once.
     */
    private ensureStarted;
    /** Handle a response line from the Python process */
    private onLine;
    /** Send a request and wait for the response (with 30s timeout) */
    private request;
    embed(text: string): Promise<number[]>;
    embedBatch(texts: string[]): Promise<number[][]>;
    dimensions(): number;
    modelId(): string;
    /** Gracefully shut down the Python process */
    close(): Promise<void>;
    /** Check if Python + sentence-transformers are available */
    static isAvailable(): boolean;
}
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