import { DidContexts } from "../models/didContexts.js";
import type { IDidVerifiableCredential } from "../models/IDidVerifiableCredential.js";
/**
 * Helper methods for creating and verifying proofs.
 */
export declare class VerifiableCredentialHelper {
    /**
     * Runtime name for the class.
     */
    static readonly CLASS_NAME: string;
    /**
     * Get the JSON-LD context URL for the verifiable credential.
     * @param verifiableCredential The verifiable credential to inspect.
     * @returns The context URL, or undefined if the version cannot be determined.
     */
    static getContext(verifiableCredential: IDidVerifiableCredential): typeof DidContexts.ContextVCv1 | typeof DidContexts.ContextVCv2 | undefined;
    /**
     * Get the context version string for the verifiable credential.
     * @param verifiableCredential The verifiable credential to inspect.
     * @returns The context version ("v1" or "v2"), or undefined if not determinable.
     */
    static getContextVersion(verifiableCredential: IDidVerifiableCredential): "v1" | "v2" | undefined;
    /**
     * Get the expiration date from a verifiable credential.
     * @param verifiableCredential The verifiable credential to inspect.
     * @returns The expiration date string, or undefined if not present.
     */
    static getValidUntil(verifiableCredential: IDidVerifiableCredential): string | undefined;
    /**
     * Set the expiration date on a verifiable credential.
     * @param verifiableCredential The verifiable credential to update.
     * @param validUntil The expiration date to set.
     */
    static setValidUntil(verifiableCredential: IDidVerifiableCredential, validUntil: string): void;
    /**
     * Get the issuance date from a verifiable credential.
     * @param verifiableCredential The verifiable credential to inspect.
     * @returns The issuance date string, or undefined if not present.
     */
    static getValidFrom(verifiableCredential: IDidVerifiableCredential): string | undefined;
    /**
     * Set the issuance date on a verifiable credential.
     * @param verifiableCredential The verifiable credential to update.
     * @param validFrom The issuance date to set.
     */
    static setValidFrom(verifiableCredential: IDidVerifiableCredential, validFrom: string): void;
}