
A component doesn’t expose its DOM nodes by default. You can opt into exposing a DOM node by using forwardRef and passing the second ref argument down to a specific node.
Less (which stands for Leaner Style Sheets) is a backwards-compatible language extension for CSS.
Bootstrap is a free (MIT license) front-end development framework for the creation of websites and web apps. Bootstrap is a powerful, feature-packed front-end toolkit.
jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.
Tooltip is a floating element that displays information related to an anchor element when it receives keyboard focus or the mouse hovers over it.
How to fix Type 'readonly Book[] | null' is not assignable to type 'readonly Book[]'. Type 'null' is not assignable to type 'readonly Book[]' in NgRx Walkthrough tutorial