End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Gem.deflate

deflate(data)

# File tmp/rubies/ruby-3.0.5/lib/rubygems.rb, line 368
def self.deflate(data)
  require 'zlib'
  Zlib::Deflate.deflate data
end

See also .default_specifications_dir .dir .default_spec_cache_dir .done_installing also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1