What is npm?
A React application is primarily JavaScript. If you have experience working with JavaScript, you know that the browser is perfectly capable of parsing and executing JavaScript on its own.
In most basic websites, we link to the JavaScript needed for the page in a <script> tag, and the browser downloads and runs it.
We'll be doing something similar with our React application (with considerable complications; more on that in Chapter 2, Getting Started with Webpack).
However, JavaScript is no longer confined to the browser. More and more applications are using JavaScript on the backend as well, with JavaScript running in its own environment.
Long story short, JavaScript is now everywhere, and the driving force behind this proliferation ...
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