Anatomy of a scrollspy component with React and TypeScript (1/2)

How to create a basic scrollspy component and integrate it with existing content.A scrollspy is a common type of in-page navigation that tracks certain page elements and shows which element the user's screen is currently centred on. In this tutorial, we will create one with React and TypeScript. Later we will look at how to make the component more reusable, and eventually publish it on npm.https://medium.com/media/ff6696688fbe574234f025735e7732b5/hrefhttps://medium.com/media/18214d8333adbb5668f31791a3202b60/hrefWhat does a Scrollspy need to do?Before creating the component itself, let's think about the behaviour we are trying to achieve. A basic scrollspy component needs to do two things, and it's right in the name: scroll and spy.First, it needs to display a clickable menu of page elements that a user can navigate to. That is the 'scroll' part.Second, it needs to update itself to highlight the currently centred item. It does this by 'spying' on the user's position in the page.Now we have an idea of what we need the component to be able to do, we can think about what we need to build.

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