import type { StepIndex, XL1BlockNumber } from '@xyo-network/xl1-protocol/protocol-lib';
/**
 * Block number of the last block of the most recent completed step frame at the given step
 * level, relative to `block`. Returns undefined when no frame at that level has completed yet.
 */
export declare function previousCompletedStepBlockNumber(block: XL1BlockNumber, step: StepIndex): XL1BlockNumber | undefined;
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