/**
 * Little-endian bit writer.
 * Writes bits LSB-first within bytes.
 */
export declare class BitWriter {
    private chunks;
    private currentByte;
    private bitOffset;
    /** Write n bits (1-32), LSB first */
    writeBits(n: number, bits: number): void;
    /** Flush remaining bits to output. Call when done writing. */
    flush(): Uint8Array;
    /** Reset writer for reuse */
    reset(): void;
}