/**
 * @pwngh/economy-lab
 *
 * Copyright (c) Preston Neal
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE.md file in the root directory of this source tree.
 *
 * @license MIT
 */
import type { Ctx, Operation, Outcome } from '../contract.js';
import type { Unit } from '../ports.js';
/**
 * Issue marketing promo credits to a user.
 *
 * Promo credits need no USD backing (unlike topped-up money), so a grant can't increase the cash
 * held in trust. They are spendable but never cashed out, because only earned credits pay out.
 *
 * @see {@link https://economy-lab-docs.pages.dev/economy/reference/operations/grant-promo/ Grant
 *   promo} for issuing unbacked, expiring marketing credits.
 */
export declare function grantPromo(operation: Operation, unit: Unit, ctx: Ctx): Promise<Outcome>;