export declare class DemoReader {
    private stream;
    constructor(buffer: ArrayBuffer);
    /**
     * Reads the next message block from the demo stream.
     * Returns null if end of stream is reached.
     * Throws if the stream is malformed (e.g., length exceeds remaining data).
     */
    readNextBlock(): {
        length: number;
        data: Uint8Array;
    } | null;
    isFinished(): boolean;
}
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