Error in Bootstrap V5 Sass: Mixin not defined - when transitioning from @import to @use module system

Transitioning to the new SASS module system with @use from @import has presented some challenges, especially when working with bootstrap v5:

https://i.sstatic.net/8Hy7W.png

Old way:

@import "~bootstrap/scss/bootstrap";
@import "~bootstrap/scss/functions";
@import "~bootstrap/scss/variables";
@import "~bootstrap/scss/mixins";

New way:

@use "~bootstrap/scss/bootstrap";
@use "~bootstrap/scss/functions";
@use "~bootstrap/scss/variables";
@use "~bootstrap/scss/mixins";

Answer №1

The latest sass directive @use operates in a completely distinctive manner compared to the previous directive @import. When using @use, you must import your variables into each file where they are required. Therefore, swapping out the old rule for the new one is not a straightforward task. If you intend to utilize @use, you will need to rethink your entire project structure.

For further insights, refer to the following question:
When importing a file with @use then: Error Undefined Mixin

Given that Bootstrap functions as a closed module that internally uses @import, a unique approach is required to incorporate the entire framework in one go. Here's a potential solution, although I have not personally verified its efficacy:
How to import and customize bootstrap with @use in SASS/SCSS

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