fix(response): serialize response data as JSON

lib/resend/response.rb

@@ -57,6 +57,19 @@ def to_h
 
     alias to_hash to_h
 
+    # Serialize response data without response headers
+    # @return [String] JSON representation of the response data
+    def to_json(*args)
+      @data.to_json(*args)
+    end
+
+    # Serialize response data for encoders that call as_json, such as ActiveSupport
+    # @param args [Array] Options forwarded to Hash#as_json when it is defined
+    # @return [Hash] The response data in as_json form
+    def as_json(*args)
+      @data.respond_to?(:as_json) ? @data.as_json(*args) : @data
+    end
+
     # Get all keys from the data
     # @return [Array] Array of keys
     def keys

spec/response_spec.rb

@@ -107,6 +107,32 @@
     end
   end
 
+  describe "#to_json" do
+    it "serializes the data without response headers" do
+      expect(response.to_json).to eq(data.to_json)
+    end
+
+    it "works with JSON.generate" do
+      expect(JSON.generate(response)).to eq(JSON.generate(data))
+    end
+
+    it "works when nested in another object" do
+      expect(JSON.generate(response: response)).to eq(JSON.generate(response: data))
+    end
+
+    it "preserves JSON formatting options" do
+      expect(JSON.pretty_generate(response)).to eq(JSON.pretty_generate(data))
+    end
+
+    it "works when nested in a hash serialized with Hash#to_json" do
+      expect({ response: response }.to_json).to eq({ response: data }.to_json)
+    end
+
+    it "works when nested in an array serialized with Array#to_json" do
+      expect([response].to_json).to eq([data].to_json)
+    end
+  end
+
   describe "enumeration" do
     describe "#each" do
       it "iterates over data" do