Instruction: Describe how to use and customize the Next.js top-level progress bar for indicating page loading.
Context: This question investigates the candidate's familiarity with UI feedback elements in Next.js, specifically the implementation and customization of a loading progress bar.
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To start, Next.js does not include a built-in progress bar for page transitions out of the box. However, a popular library that seamlessly integrates with Next.js for this purpose is nprogress. It's lightweight and offers customizable options to suit different UI requirements.
First, to implement nprogress in a Next.js application, you need to install the library. This can be done by running npm install nprogress or yarn add nprogress in the terminal. Once installed, you should import nprogress and the corresponding CSS file in your _app.js or _app.tsx file, which is the main entry point for global styles and libraries in a Next.js application....