Get rid of huge Font Awesome icons on Gatsby

Posted at Jan 9, 2020 - Tagged as developmentgatsbyjsfontawesome

When building this site I noticed that on the first load before anything is cached on the browser, the Font Awesome icons used in the footer and contact section were huge for a second or two, it looks ugly so it needed to be fixed.

Why it happens?

The usage of a Font Awesome icon on React/Gatsby/etc is like this:

import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faGithub } from '@fortawesome/free-brands-svg-icons';

const MyComponent = () => <FontAwesomeIcon icon={faGithub} />;

On a normal app, it works fine because the CSS is loaded right before the icon is rendered, so there is no visible change of the size, but on an SSR app (like with Gatsby), the code for the icon already exists before the CSS is loaded, so it gets the needed style after a few milliseconds, resulting in the flickering of the icon size.


We need to disable the auto-loading of CSS by FontAwesome and add the styles ourselves, this way they are already embedded when Gatsby builds the site.

in my case it was accomplished by modifying the gatsby-browser.js file and adding:

import { config } from '@fortawesome/fontawesome-svg-core';
import '@fortawesome/fontawesome-svg-core/styles.css';

config.autoAddCss = false;

And that’s it!

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