Can you explain the significance of using `!important` in CSS without specifying a value?

Scenario:

Currently, I am facing an issue with using the bootstrap 4 stylesheet in conjunction with NextJS. The bootstrap 4 stylesheet, compiled from SASS, contains code like:

.checkbox.checkbox-accent > span {
  border-width: !important;
}

This specific code snippet is causing problems during the production build of NextJS. Upon running yarn build, I encounter the following error:

yarn run v1.22.4
$ next build
info  - Creating an optimized production build
Failed to compile.

TypeError: Cannot read property 'toLowerCase' of undefined


> Build error occurred
Error: > Build failed because of webpack errors
    at /home/musa/codes/paisaha/finance-nextjs/node_modules/next/dist/build/index.js:441:19
    at async /home/musa/codes/paisaha/finance-nextjs/node_modules/next/dist/build/tracer.js:1:1441
error Command failed with exit code 1.

However, by adding a value before the !important in the CSS, such as:

.checkbox.checkbox-accent > span {
  border-width: unset !important;
}

Query:

I am curious to know what exactly does !important without a value signify? Is this a valid piece of CSS code, or could it be an issue related to SASS compilation, or perhaps something linked to the webpack compiler utilized by NextJS?

Additional Information:

  • yarn dev functions correctly
  • "dependencies": { "next": "10.0.6", "react": "17.0.1", "react-dom": "17.0.1" }
  • NodeJS version: v12.18.2
  • Platform: WSL2 on Windows 10
csswebpacknext.js

Answer №1

While experimenting with the !important declaration in a SASS file within VS Code, I encountered an error message:

"property value expectedscss(css-propertyvalueexpected)"

It seems that the placement of this line may indicate an issue in the code prior to compilation.

Answer №2

It appears that you have neglected to include certain variables in your code.

Take a look at the original SASS file. It likely contains something similar to this:

border-width: $border-width !important;

However, it seems that the value for the $border-width variable is currently set as an empty string (if it was completely undefined, the code wouldn't compile)

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