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"Upgrading from bs3 to bs4 is as close to a complete rewrite of your front end as you can get."

That's slightly hyperbolic. I don't think they intend for the primary use case to be for people to upgrade in place, like updating a nightly Firefox, but rather to start new projects with the new version. But previous big upgrades have been largely a bunch of search and replaces. There's various tools that people have written to automate this. Again, I wouldn't blindly run it and expect everything to work, but it's far, far less than a complete rewrite.

Completely agree, wasn't intending to be hyperbolic. My intention was to indicate to the GP that upgrading an existing project from bs3 to 4 would be hard and mostly unnessasery. And clearly not the main intention of the bs team.

We all do tend to do a redesign of our sites and apps eventually and that the correct time to make the transition.

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