How to add a favicon to a Next.js static site?

I'm trying to add a favicon to a Next.js static site without much luck.

I've tried customising the document with components from 'next/document' https://nextjs.org/docs/#custom-document

A straight link to the favicon.ico file doesn't work because the file isn't included in the build and the href doesn't update to /_next/static/...

Importing the image and adding to the link's href doesn't work either (see commented out lines).

import React from 'react';
import Document, { Html, Head, Main, NextScript } from 'next/document';

// import favicon from '../data/imageExports';

export default class MyDocument extends Document {
  static async getInitialProps(ctx) {
    const initialProps = await Document.getInitialProps(ctx);
    return { ...initialProps };
  }

  render() {
    return (
      <Html>
        <Head>
          {/* <link rel="shortcut icon" href={favicon} /> */}
          <link rel="shortcut icon" href="../images/icons/favicon.ico" />
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    );
  }
}

The favicon links get added however it doesn't display. I'd expect it to work when I import the file, but it just adds a <link rel="shortcut icon" href="[object Object]"> link.

Has anyone done this yet?

Solution

Create a /static folder in project root. This will be added to the static export folder.
Add favicon file in /static folder.
Add _document.js to /pages/ folder according to documentation (nextjs.org) or documentation (github.com).
Add <link rel="shortcut icon" href="/static/favicon.ico" /> to head.
npm run build && npm run export

P.S. Thanks to the previous answer that was deleted. It works!

Edit: Another way is to do this is to import Head into your root layout and add the link there. Anything added to Head gets inserted into the document head tag.

import Head from 'next/head';

const Page = (props) => (
  <div>
    <Head>
      <link rel="shortcut icon" href="/static/favicon.ico" />
    </Head>
    // Other layout/components
  </div>
);

export default Page;

Update :

The static directory has been deprecated in favor of the public directory. Doc

So, the code would now look like

import Head from 'next/head';

const Page = (props) => (
  <div>
    <Head>
      <link rel="shortcut icon" href="/favicon.ico" />
    </Head>
    // Other layout/components
  </div>
);