End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Gem.post_install

post_install(&hook)

# File tmp/rubies/ruby-3.1.3/lib/rubygems.rb, line 680
def self.post_install(&hook)
  @post_install_hooks << hook
end

Adds a post-install hook that will be passed an Gem::Installer instance when Gem::Installer#install is called

See also .post_build .post_reset .plugin_suffix_regexp .post_uninstall also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0