export declare class MerkleRootTracker {
    private acceptableRootWindowSize;
    private validMerkleRoots;
    private merkleRootBuffer;
    constructor(acceptableRootWindowSize: number, initialRoot: Uint8Array);
    backFill(fromBlockNumber: number): void;
    pushRoot(blockNumber: number, root: Uint8Array): void;
    roots(): Array<Uint8Array>;
    buffer(): Array<Uint8Array>;
}