export declare class BcsReader {
    private dataView;
    private bytePosition;
    constructor(data: Uint8Array);
    shift(bytes: number): this;
    read8(): number;
    read16(): number;
    read32(): number;
    read64(): string;
    read128(): string;
    read256(): string;
    readBytes(num: number): Uint8Array;
    readULEB(): number;
    readVec(cb: (reader: BcsReader, i: number, length: number) => any): any[];
}