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fatal: pack has unresolved deltas

What

In Git, a pack (also called a packfile) is a compressed storage format that Git uses to efficiently store objects (commits, trees, blobs, and tags).

If you try and manually delete the file, you get the error

fatal: pack has unresolved deltas

How to resolve

mv .git .git-old
git init
git remote add origin <repo url>
git fetch
git reset origin/main --mixed
git branch --set-upstream-to=origin/main main

If you have pre-commit configured, re-install it

pre-commit install

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