/**
 * Whether a default package rendering now should select itself. It should
 * while the paywall, a newly chosen tab or a sheet first renders, but not when
 * a rule shows its stack again later and the user has picked something else.
 */
export type DefaultSelectionOpen = () => boolean;
/**
 * Open until Svelte has applied the update in progress, which mounts the
 * paywall's, sheet's or new tab's packages and runs their effects. A tab
 * switch reuses the package components, so the window can't close on a mount.
 * Packages that render in a later update, such as a stack a rule shows again,
 * find it closed. Covered by the "package selection" tests in
 * window-size-rules.test.ts and by package-default-selection-tabs.test.ts.
 */
export declare function openDefaultSelection(): DefaultSelectionOpen;
export declare function setDefaultSelectionContext(isOpen: DefaultSelectionOpen): void;
export declare function getDefaultSelectionContext(): DefaultSelectionOpen;