fix: remove hard requirements on active_support and webmock

lib/pact.rb

@@ -5,6 +5,10 @@
 
 require 'pact/railtie' if defined?(Rails::Railtie)
 
+# Load blank?/present? polyfill before Zeitwerk eager-loads the rest of the gem.
+# Skipped if active_support (or anything else) has already defined these methods.
+require 'pact/support/blank'
+
 module Pact
   class Error < StandardError; end
 
@@ -41,6 +45,7 @@ def self.configuration
 loader.ignore("#{__dir__}/pact/version.rb")
 loader.ignore("#{__dir__}/pact/rspec.rb")
 loader.ignore("#{__dir__}/pact/rspec")
+loader.ignore("#{__dir__}/pact/support/blank.rb")
 loader.ignore("#{__dir__}/pact/railtie.rb") unless defined?(Rails::Railtie)
 
 loader.setup

lib/pact/rspec/support/webmock/webmock_helpers.rb

@@ -2,7 +2,7 @@
 
 module WebmockHelpers
   def self.turned_off
-    yield unless defined?(::WebMock)
+    return yield unless defined?(::WebMock)
 
     allow_net_connect = WebMock::Config.instance.allow_net_connect
     allow_localhost = WebMock::Config.instance.allow_localhost

lib/pact/support/blank.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# Minimal blank?/present? polyfill for when active_support is not loaded.
+# Skipped entirely if Object already responds to blank? (e.g. active_support is present).
+unless Object.method_defined?(:blank?)
+  class NilClass
+    def blank? = true
+    def present? = false
+  end
+
+  class FalseClass
+    def blank? = true
+    def present? = false
+  end
+
+  class TrueClass
+    def blank? = false
+    def present? = true
+  end
+
+  class String
+    def blank? = empty? || strip.empty?
+    def present? = !blank?
+  end
+
+  class Array
+    def blank? = empty?
+    def present? = !empty?
+  end
+
+  class Hash
+    def blank? = empty?
+    def present? = !empty?
+  end
+
+  class Object
+    def blank? = !self
+    def present? = !!self
+  end
+end

pact.gemspec

@@ -27,6 +27,12 @@ Gem::Specification.new do |gem|
     'documentation_uri' => 'https://github.com/pact-foundation/pact-ruby/blob/master/README.md'
   }
 
+  # Optional runtime dependencies (not required by pact itself):
+  #   active_support — if already loaded, its blank?/present? take precedence over
+  #                    pact's built-in polyfill (lib/pact/support/blank.rb).
+  #   webmock        — only needed for WebMock integration via WebmockHelpers.
+  #                    Require it yourself before using that helper.
+
   # Core dependencies (code loading)
   gem.add_dependency 'zeitwerk', '~> 2.3'
   # For Pact support via Pact Rust Core