Whenever I attempt to style a html/jsx tag in css, I receive an error message stating that 'h1 "selector" is not pure'

Issue: The CSS selector "h1" is not considered pure (pure selectors must include at least one local class or id)

  5 | }
  6 | 
> 7 | h1 {
    |              ^
  8 |   font-size: 48px;
  9 |   text-align: center

Encountered this error while attempting to style elements that are not identified by an id or class. This problem is new to me and I have been working with Next.js for a while now. Seeking a solution but unable to find one at the moment.

Answer №1

When utilizing Next.js, the built-in css-loader is set up to require all selectors to be pure, meaning you cannot target elements by their tag. This change seems to have been implemented in a release following v9.0.

You can find a detailed discussion on this topic here, along with other related issues on their GitHub repository. As far as I know, this behavior is intentional and the options to work around it are:

  1. Embrace the limitation and avoid using implicit HTML selectors
  2. Adjust next.config.js to alter the functionality of css-loader

In the end, while the enforced limitation encourages better CSS practices, it can pose a significant challenge for larger projects with many legacy stylesheets migrating to Next.js.

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