export type LedgerV3Object = Record<string, unknown>;
/**
 * Event kinds that 0.30.0 and earlier wrote and 0.31.0 no longer builds (the check runner and workflow facts were
 * deleted). A ledger is append-only, so a line written then is still a valid line now: readers accept these
 * discriminators as historical and count them, and nothing here can produce a new one. Removing a kind from this
 * set turns an operator's existing record into "corrupt" on upgrade, which is the failure this set exists to prevent.
 */
export declare const RETIRED_LEDGER_EVENT_KINDS: ReadonlySet<string>;
export declare function isRetiredLedgerEvent(event: {
    event?: unknown;
}): boolean;
export declare function isLedgerObject(value: unknown): value is LedgerV3Object;
export declare function isNonEmptyString(value: unknown): value is string;
/** Ledger timestamp profile: JSON Schema `date-time`, narrowed to seconds 00-59 for JS date arithmetic. */
export declare function isTimestamp(value: unknown): value is string;
export declare function isStringArray(value: unknown): value is string[];
/** Exact, content-free runtime validation for one closed ledger v3 event. */
export declare function validateLedgerV3Event(event: LedgerV3Object): string | null;
/** Ensure a public builder cannot emit bytes the closed v3 reader would reject. */
export declare function assertLedgerV3Wire<T extends object>(event: T): T;
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