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Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →

class method

Gem.pre_install

pre_install(&hook)

Adds a pre-install hook that will be passed an Gem::Installer instance when Gem::Installer#install is called. If the hook returns false then the install will be aborted.

See also .prefix .pre_reset .post_uninstall .pre_uninstall also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0