rc-hooks/es/utils/index.js

React Hooks Library.

export function isDocumentVisible() {
    if (typeof document !== 'undefined' && typeof document.visibilityState !== 'undefined') {
        return document.visibilityState !== 'hidden';
    }
    return true;
}
export function isOnline() {
    if (typeof navigator !== 'undefined' && typeof navigator.onLine !== 'undefined') {
        return navigator.onLine;
    }
    return true;
}