Implement Kangaru.eager_load

lib/kangaru.rb

@@ -13,5 +13,9 @@ module Kangaru
 
   class << self
     attr_accessor :application
+
+    def eager_load(namespace)
+      @loader.eager_load_namespace(namespace)
+    end
   end
 end

sig/kangaru.rbs

@@ -7,6 +7,8 @@ module Kangaru
     @loader: Zeitwerk::Loader
 
     attr_accessor application: Application
+
+    def eager_load: (Module) -> void
   end
 
   # Included in target applications that extend Kangaru::Initialiser.

sig/zeitwerk/loader.rbs

@@ -0,0 +1,5 @@
+module Zeitwerk
+  class Loader
+    def eager_load_namespace: (Module) -> void
+  end
+end

spec/kangaru_spec.rb

@@ -16,4 +16,23 @@
       expect(loader.dirs).to include(lib_directory)
     end
   end
+
+  describe ".eager_load" do
+    subject(:eager_load) { described_class.eager_load(namespace) }
+
+    let(:namespace) { Module.new }
+
+    let(:loader) { described_class.instance_variable_get(:@loader) }
+
+    before { allow(loader).to receive(:eager_load_namespace) }
+
+    it "delegates to the zeitwerk loader" do
+      eager_load
+
+      expect(loader)
+        .to have_received(:eager_load_namespace)
+        .with(namespace)
+        .once
+    end
+  end
 end