export declare class ReadStreamClosed extends Error {
    constructor(message: string);
}
export declare function concatBuffer(arr: any[]): Uint8Array;
export declare function readUntilEof(readableStream: ReadableStream, blockSize: number): Promise<Uint8Array>;
export declare function buffRead(readableStream: ReadableStream, size: number): Promise<{
    eof: boolean;
    buff: any;
} | null>;
export declare function buffReadFrombyobReader(reader: any, buffer: any, offset: number, size: number): Promise<{
    eof: boolean;
    buff: any;
} | null>;
export declare function getArrayBufferByteLength(arrayBuffer: any[]): number;
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