Note This is a fork of nextjs-progressbar by apal21. It adds an optional debounce to the progress bar to prevent it from flickering when the page loads quickly.

A simple Next.js progressbar component using NProgress.

After installing the package, import NextProgress in your pages/_app.tsx file and add <NextProgress /> to the render function in App:

import NextProgress from '@approximant/next-progress';

export default function App({ Component, pageProps }) {
  return (
    <>
      <NextProgress />
      <Component {...pageProps} />;
    </>
  );
}

If no props are passed to <NextProgress />, the default configuration is applied.

// Default config
<NextProgress 
  debounce={300}
  color="#29D"
  startPosition={0.3}
  stopDelayMs={200}
  height={3}
  showOnShallow={true}  
  />

• debounce: Debounce time in ms. The progress bar will not be shown if the page loads in less than this time.
• color: to change the default color of progressbar. You can also use rgb(,,) or rgba(,,,).
• startPosition: to set the default starting position : 0.3 = 30%.
• stopDelayMs: time for delay to stop progressbar in ms.
• height: height of progressbar in px.
• showOnShallow: You can choose whether you want the progressbar to be displayed if you're using shallow routing. It takes a boolean. Learn more about shallow routing in Next.js docs.

We use internal css in this package. If you are using csp, you can add nonce to the <style> tag by providing nonce prop to <NextProgress /> component.

<NextProgress nonce="my-nonce" />

You can use transformCSS prop to pass custom css. Note: You must return a JSX.Element from the function.

NextProgress<
  transformCSS={(css) => {
    // css is the default css string. You can modify it and return it or return your own css.
    return <style>{css}</style>;
  }}
/>

You can use other configurations which NProgress provides by adding a JSON in options props.

<NextProgress options={{ easing: 'ease', speed: 500 }} />