export declare const canUseDOM: boolean;
export declare const canUseWorkers: boolean;
export declare const canUseEventListeners: boolean;
export declare const canUseViewport: boolean;
export declare const isInWorker: boolean;
export declare const isBrowser: false | (Window & typeof globalThis);
export declare const safeWindow: <T>(fn: (win: Window) => T) => T | undefined;
export declare const safeDocument: <T>(fn: (doc: Document) => T) => T | undefined;