/**
 * Server-safe `ag-shell-*` cookie parser (SURF-007).
 * Cookie body is `sidebar:<state>,inspector:<state>` in any key order with
 * (';' still parsed — it was the old separator, which document.cookie
 * truncates so it could never have round-tripped in a real browser).
 * extra keys tolerated. Never throws; anything oversized or malformed
 * parses to {}.
 */
export type SidebarState = 'expanded' | 'rail' | 'collapsed';
export type InspectorState = 'open' | 'closed';
export interface AppShellCookie {
    sidebar?: SidebarState;
    inspector?: InspectorState;
}
export declare function parseAppShellCookie(value: string | undefined | null): AppShellCookie;
/** Cookie value body (`sidebar:x,inspector:y`) without name or attributes. */
export declare function serializeAppShellCookieValue(state: AppShellCookie): string;
/** Full `ag-shell-<key>=...` Set-Cookie pair (SURF-007). */
export declare function serializeAppShellCookie(key: string, state: AppShellCookie): string;
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