Yarn build:production fails on Bootstrap compilation

[strarsis]

See this guide for updating an existing Sage 9 theme:

Sage "9.1": Please test

Note: Changed Sage 9.2 to 9.1 (as 9.0.10 is the current release in master). Updated Sage 9.x You can now try out the Sage PR branch for webpack 5 and updated dependencies. The sage-installer which is used by Sage 9.x for adding framework support was also updated to add the right configuration and styles. Bootstrap 5 (Beta2) has been added for selection. Tailwind 2 is used now. Trying it out now! To prevent siloing of existing working forks of Sage 9 + (insert framework), please try this set…

Well, the latest Sage 9.x updates update a lot of dependency, hence fixing lots of issues.
You don’t have to update… but sometimes it can fix the root causes.