import type { CheckpointNumber } from '@aztec/foundation/branded-types';
import type { Fr } from '@aztec/foundation/curves/bn254';
import type { L2Tips } from '../block/l2_block_source.js';
/**
 * Interface of classes allowing for the retrieval of L1 to L2 messages.
 */
export interface L1ToL2MessageSource {
    /**
     * Gets new L1 to L2 message (to be) included in a given checkpoint.
     * @param checkpointNumber - Checkpoint number to get messages for.
     * @returns The L1 to L2 messages/leaves of the messages subtree (throws if not found).
     */
    getL1ToL2Messages(checkpointNumber: CheckpointNumber): Promise<Fr[]>;
    /**
     * Gets the L1 to L2 message index in the L1 to L2 message tree.
     * @param l1ToL2Message - The L1 to L2 message.
     * @returns The index of the L1 to L2 message in the L1 to L2 message tree (undefined if not found).
     */
    getL1ToL2MessageIndex(l1ToL2Message: Fr): Promise<bigint | undefined>;
    /**
     * Returns the tips of the L2 chain.
     */
    getL2Tips(): Promise<L2Tips>;
}
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