Removing FOUC in a Gatsby App

As I've been working more with Gatsby and styled-components, I've run across an issue with flashes of unstyled content showing on page load and refresh in an application deployed to Netlify. Squashing this issue required a bit of exploration.

Here are the two steps that eventually fixed my problem:

1. Install the gatsby-plugin-styled-components styled-components babel-plugin-styled-components plugins and update the gatsby-config.js file (example below). I had only imported styled-components library, not knowing the other packages were needed.

   This corrected the majority of issues I was having on page refresh. However, the unstyled font flicker was a little tricker to fix. After some experimentation I finally discovered that the gatsby-plugin-typograpy package did the trick.

2. Install the gatsby-plugin-typography, react-typography and typography packages and update the gatsby-config.js (also below) in order to fix font issues.

   This involves creating a src/utils folder, with a typography.js file. In order to use Google fonts, the typography file required some configurations.

   Here's mine:
   

// typography.js

import Typography from "typography"

const typography = new Typography({
  baseFontSize: "18px",
  baseLineHeight: 1.666,
  googleFonts: [
    { name: "Bai Jamjuree", styles: [700] },
    { name: "Muli", styles: [400, 700, 800] },
  ],
  headerFontFamily: ["Muli", "sans-serif"],
  bodyFontFamily: ["Muli", "serif"],
})

export default typography

Despite not setting the Bai Jamjuree font to either headerFontFamily or bodyFontFamily, I was able to use it elsewhere in my application.

Here's my gatsby-config.js file:

// gatsby-config.js

  plugins: [
    {
      resolve: `gatsby-plugin-styled-components`,
      options: {
        // Add any options here
      },
    },
    {
      resolve: `gatsby-plugin-typography`,
      options: {
        pathToConfigModule: `src/utils/typography`,
      },
    }
  ]

Hope this helps!