import { LogContext } from '@balena/jellyfish-logger';
import type { AutumnDBSession, Contract, JsonSchema, Kernel } from 'autumndb';
import type { ActionContract } from '.';
/**
 * @summary Get the current timestamp
 * @function
 * @public
 *
 * @returns RFC 3339 timestamp
 *
 * @example
 * const timestamp = utils.getCurrentTimestamp();
 */
export declare const getCurrentTimestamp: () => string;
/**
 * @summary Get the arguments schema from an action contract
 * @function
 * @public
 *
 * @param actionContract - action contract
 * @returns arguments schema
 *
 * @example
 * const schema = utils.getActionArgumentsSchema({ ... });
 * console.log(schema.type);
 */
export declare const getActionArgumentsSchema: (actionContract: ActionContract) => JsonSchema;
/**
 * @summary Check if a contract exists in the system
 * @function
 * @public
 *
 * @param logContext - log context
 * @param kernel - kernel instance
 * @param session - session id
 * @param object - contract properties
 * @returns whether the contract exists
 *
 * @example
 * const session = '4a962ad9-20b5-4dd8-a707-bf819593cc84';
 * const hasContract = await utils.hasContract({ ... }, kernel, session, {
 *   id: 'a13474e4-7b44-453b-9f3e-aa783b8f37ea',
 *   active: true,
 *   data: {
 *     foo: 'bar',
 *   },
 * });
 *
 * if (hasContract) {
 *   console.log('This contract already exists');
 * }
 */
export declare const hasContract: (logContext: LogContext, kernel: Kernel, session: AutumnDBSession, object: Pick<Contract, 'slug' | 'version' | 'id'>) => Promise<boolean>;
/**
 * @summary Get the slug for an event
 * @function
 * @public
 *
 * @param {String} type - event type
 * @returns {String} slug
 *
 * @example
 * const slug = await utils.getEventSlug('execute')
 */
export declare const getEventSlug: (type: string) => string;
/**
 * @summary Convert an ISO 8601 duration to milliseconds
 * @function
 *
 * @param duration - the ISO 8601 duration (e.g. 'PT1H')
 * @returns the duration in milliseconds, or 0 if the duration is invalid
 */
export declare const durationToMs: (duration: string) => number;
export declare const getQueryWithOptionalLinks: (object: {
    id?: string;
    slug?: string;
    version?: string;
}, linkVerbs?: string[]) => JsonSchema;