/**
 *   Mailbox - https://github.com/huan/mailbox
 *
 *   @copyright 2024 Huan LI (李卓桓) <https://github.com/huan>
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
import type { AnyActorLogic } from 'xstate';
/**
 * Validation error with detailed message
 */
export declare class MailboxValidationError extends Error {
    constructor(message: string);
}
/**
 * Validate that a machine satisfies the Mailbox address protocol.
 *
 * A valid mailbox-addressable machine MUST:
 * 1. Send `ACTOR_IDLE` event to parent immediately after initialization
 * 2. Return to an idle state (with idle action) after processing events
 *
 * @param machine - The XState machine to validate
 * @returns true if valid
 * @throws MailboxValidationError if validation fails
 *
 * @example
 * ```typescript
 * import * as Mailbox from 'mailbox'
 *
 * const myMachine = createMachine({
 *   id: 'my-machine',
 *   initial: 'idle',
 *   states: {
 *     idle: {
 *       entry: Mailbox.actions.idle('my-machine'),
 *       on: { WORK: 'working' },
 *     },
 *     working: {
 *       always: 'idle',
 *     },
 *   },
 * })
 *
 * // Throws if machine doesn't satisfy protocol
 * Mailbox.validate(myMachine)
 * ```
 */
export declare function validate(machine: AnyActorLogic): boolean;
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