import type { IVerifiableCredential } from '@interop/data-integrity-core';
export declare const CREDENTIALS_CONTEXT_V1_URL: string;
export declare const CREDENTIALS_CONTEXT_V2_URL: string;
export declare const dateRegex: RegExp;
/**
 * Asserts that a context array's first item is a credentials context.
 *
 * @throws {Error} If the first context is not a credentials context.
 */
export declare function assertCredentialContext({ context }: {
    context: unknown[];
}): void;
/**
 * Throws if a Date is not in the correct format.
 *
 * @throws {Error} Throws if the date is not a proper date string.
 */
export declare function assertDateString({ credential, prop }: {
    credential: Record<string, unknown>;
    prop: string;
}): void;
/**
 * Checks if a VC is using a specific context version.
 *
 * @returns True if the first context matches the version.
 */
export declare function checkContextVersion({ credential, version }: {
    credential?: IVerifiableCredential;
    version: number;
}): boolean;
/**
 * Compares two times with consideration of max clock skew.
 *
 * `maxClockSkew` is in seconds. Returns a number greater than, equal to, or
 * less than zero, comparable to a sort comparator.
 */
export declare function compareTime({ t1, t2, maxClockSkew }: {
    t1: Date | number;
    t2: Date | number;
    maxClockSkew: number;
}): number;
//# sourceMappingURL=helpers.d.ts.map