Add global definitions of class variants.

lib/class_variants.rb

@@ -20,5 +20,17 @@ def configure(&block)
     def build(...)
       Instance.new(...)
     end
+
+    def definitions
+      @definitions ||= {}
+    end
+
+    def define(name, ...)
+      definitions[name.to_sym] = Instance.new(...)
+    end
+
+    def for(name)
+      definitions[name.to_sym]
+    end
   end
 end

test/definitions_test.rb

@@ -0,0 +1,22 @@
+require "test_helper"
+
+class DefinitionsTest < Minitest::Test
+  def setup
+    ClassVariants.define :button do
+      variant color: :primary, class: "bg-orange-500"
+    end
+
+    ClassVariants.define :link do
+      variant color: :primary, class: "bg-blue-500"
+    end
+  end
+
+  def teardown
+    ClassVariants.instance_variable_set(:@definitions, nil)
+  end
+
+  def test_definitions
+    assert_equal "bg-orange-500", ClassVariants.for(:button).render(color: :primary)
+    assert_equal "bg-blue-500", ClassVariants.for(:link).render(color: :primary)
+  end
+end