export declare class WebmBase<DataT, ValueT> {
    name: string;
    start: number;
    source: Uint8Array | undefined;
    data: DataT | undefined;
    protected constructor(name?: string, start?: number);
    getType(): string;
    updateBySource(): void;
    setSource(source: Uint8Array): void;
    updateByData(): void;
    setData(data: DataT): void;
    getValue(): ValueT;
    setValue(value: ValueT): void;
}