/** macOS or iOS. */
export declare function isMac(): boolean;
/** A surface binding bare keys reads this first: a `j` in a note is a letter, never "next". */
export declare function isTyping(target: EventTarget | null): boolean;
export interface ShortcutDescriptor {
    key: string;
    ctrlKey?: boolean;
    shiftKey?: boolean;
    altKey?: boolean;
}
/** "⌘⇧S" on Mac, "Ctrl+Shift+S" elsewhere. */
export declare function formatShortcut(shortcut: ShortcutDescriptor): string;