import type { BallotFileFormat, VoteFileFormat } from "./parser";
export declare function getReasonForInvalidateBallot(ballotFile: BallotFileFormat, voteFile: VoteFileFormat, author?: string): null | {
    invalidChecksum?: {
        expected: string;
        actual: string;
    };
    missingAuthor?: true;
    missingCandidates?: VoteFileFormat["candidates"];
    candidatesWithInvalidScores?: BallotFileFormat["preferences"];
};