/** Open, close, and what a toggle does when the thing it would open has nothing to show. */
export interface MdyOverlayLifecycleState {
    readonly open: boolean;
}
export type MdyOverlayLifecycleIntent = {
    readonly type: "toggle";
    readonly disabled: boolean;
    readonly available: boolean;
} | {
    readonly type: "open";
    readonly disabled: boolean;
    readonly available: boolean;
} | {
    readonly type: "close";
    readonly restoreFocus?: boolean;
} | {
    readonly type: "escape";
} | {
    readonly type: "outside";
    readonly outside: boolean;
} | {
    readonly type: "destroy";
};
export interface MdyOverlayLifecycleTransition {
    readonly state: MdyOverlayLifecycleState;
    readonly effect: "none" | "setup" | "teardown";
    readonly restoreFocus: boolean;
    readonly announce: "opened" | "closed" | null;
}
/**
 * Framework-independent overlay lifecycle. Hosts install/remove concrete DOM
 * listeners and execute focus restoration, but do not decide when to close.
 */
export declare function overlayLifecycleTransition(state: MdyOverlayLifecycleState, intent: MdyOverlayLifecycleIntent): MdyOverlayLifecycleTransition;