export declare function clearLedgerCache(ledgerPath?: string): void;
export interface AppendLedgerRecordArgs {
    ledgerPath: string;
    ledgerName: string;
    recordType: string;
    fields: ReadonlyArray<readonly [string, string | number]>;
    stampSrc: string;
    ts?: string;
}
export interface AppendLedgerRecordResult {
    ts: string;
    hash: string;
    initialised: boolean;
}
export interface RotateLedgerFileArgs {
    ledgerPath: string;
    archivedPath: string;
    ledgerName: string;
    fromMonth: string;
    toMonth: string;
    stampSrc: string;
}
export declare function rotateLedgerFile(args: RotateLedgerFileArgs): boolean;
export declare function appendLedgerRecord(args: AppendLedgerRecordArgs): AppendLedgerRecordResult;
export declare function ensureLedgerHeader(ledgerPath: string, ledgerName: string, monthKey: string): boolean;
export declare function monthKeyFromIsoTs(ts: string): string;
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