import { Node } from "@chainsafe/persistent-merkle-tree";
/** Root node (chunks + length mix-in) of a zero-filled ProgressiveListBasicType of `length` items */
export declare function zeroProgressiveListBasicRootNode(itemsPerChunk: number, length: number): Node;
/**
 * Check if an array-type ViewDU (ListBasic, ListComposite or their progressive equivalents) has its
 * internal nodes cache populated. The flag is a private attribute maintained by all of these classes.
 */
export declare function isViewDUNodesPopulated(view: unknown): boolean;
/**
 * Root node of a progressive list from its chunk/element nodes + length mix-in.
 * `nodes` are packed 32-byte chunk leaves for basic lists, or element root nodes for composite lists.
 */
export declare function progressiveListRootNode(nodes: Node[], length: number): Node;
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