import type { AggregationTreeState } from "../types.js";
/**
 * Returns the transfer tree index for a specific chain ID in an aggregation tree state.
 *
 * @throws Error if the chain ID is not present, or if the snapshot is missing the corresponding index.
 */
export declare function getTreeIndexForChain(state: AggregationTreeState, chainId: bigint): bigint;
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