/*!
 * Copyright (c) 2026-present, Okta, Inc. and/or its affiliates. All rights reserved.
 * The Okta software accompanied by this notice is provided pursuant to the Apache License, Version 2.0 (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 MessageOf } from "../createMessageChannel.js";
/**
 * The messages every Odyssey app on the page and the fullscreen mode host send each other.
 *
 * Apps only ask. The host, which Unified UI Shell runs, owns the stack and is the only sender of `stateChanged`. Every change, and every reply to `stateRequested`, is the same full snapshot, so an app that starts late never replays an enter that already happened.
 *
 * **This is a cross-version contract.** Apps and UI Shell can each be on a different Odyssey version, so a message type or payload field can be added but never renamed, removed, or given a new meaning without raising `protocolVersion`.
 */
export declare const fullscreenMessageChannel: import("../createMessageChannel.js").DefinedMessageChannel<"fullscreen", {
    /**
     * An app asks for an id to go on top of the stack. An id already in the stack moves to the top.
     */
    enterRequested: (payload: unknown) => payload is {
        fullscreenId: string;
    };
    /**
     * An app asks for every id to leave the stack, returning the page to how it was before anything entered fullscreen.
     */
    exitAllRequested: (payload: unknown) => payload is Record<string, never>;
    /**
     * An app, or the host on Escape, asks for an id to leave the stack, wherever it is. The id under it is shown again.
     */
    exitRequested: (payload: unknown) => payload is {
        fullscreenId: string;
    };
    /**
     * The host's stack, bottom first. Sent after every change and in reply to `stateRequested`.
     */
    stateChanged: (payload: unknown) => payload is {
        fullscreenStack: string[];
    };
    /**
     * An app that just started asks the host for the current stack.
     */
    stateRequested: (payload: unknown) => payload is Record<string, never>;
}>;
export type FullscreenMessage = MessageOf<typeof fullscreenMessageChannel>;
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