/**
 * @fileoverview Capability Token serialization/deserialization helpers
 *
 * Converts ICapabilityToken instances to/from JSON strings, handling:
 * - Uint8Array fields ↔ hex string encoding
 * - Date fields ↔ ISO 8601 string encoding
 * - All other fields pass through as-is
 *
 * Follows the same pattern as aclDocumentSerialization.ts.
 *
 * @see BrightDB Write ACLs design, Capability Token Format
 * @see Requirements 6.6
 */
import { ICapabilityToken } from './capabilityToken';
import { IAclScope } from './writeAcl';
/**
 * JSON-serializable representation of ICapabilityToken.
 *
 * Uint8Array fields are hex-encoded strings.
 * Date fields are ISO 8601 strings.
 */
export interface SerializedCapabilityToken {
    granteePublicKey: string;
    scope: IAclScope;
    expiresAt: string;
    grantorSignature: string;
    grantorPublicKey: string;
}
/**
 * Serialize an ICapabilityToken to a JSON string.
 *
 * - Uint8Array fields (granteePublicKey, grantorSignature,
 *   grantorPublicKey) are hex-encoded.
 * - Date fields (expiresAt) are ISO 8601 strings.
 * - All other fields pass through unchanged.
 *
 * @param token - The capability token to serialize
 * @returns JSON string representation
 * @see Requirements 6.6
 */
export declare function serializeCapabilityToken(token: ICapabilityToken): string;
/**
 * Deserialize a JSON string into an ICapabilityToken.
 *
 * - Hex-encoded strings are converted back to Uint8Array.
 * - ISO 8601 strings are converted back to Date objects.
 * - All other fields pass through unchanged.
 *
 * @param json - JSON string to deserialize
 * @returns The deserialized capability token
 * @throws Error if the JSON is malformed or contains invalid data
 * @see Requirements 6.6
 */
export declare function deserializeCapabilityToken(json: string): ICapabilityToken;
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