feat: support deleting properties from package.json

README.md

@@ -52,6 +52,9 @@ package_json.merge! do |pj|
   }
 end
 
+# deletes the "babel" property, if it exists
+package_json.delete!("babel")
+
 # runs the "lint" script with the "--fix" argument
 package_json.manager.run("lint", ["--fix"])
 ```

lib/package_json.rb

@@ -77,6 +77,16 @@ def merge!
     write_package_json(pj.merge(yield read_package_json))
   end
 
+  def delete!(key)
+    pj = read_package_json
+
+    value = pj.delete(key)
+
+    write_package_json(pj)
+
+    value
+  end
+
   private
 
   def package_json_path

spec/package_json_spec.rb

@@ -379,4 +379,38 @@
       end
     end
   end
+
+  describe "#delete!" do
+    it "deletes the key from the package.json" do
+      with_package_json_file({ "version" => "1.0.0", "babel" => { "presets" => ["path/to/my/preset"] } }) do
+        package_json = described_class.new
+
+        package_json.delete!("babel")
+
+        expect_package_json_with_content({ "version" => "1.0.0" })
+      end
+    end
+
+    it "returns the value" do
+      with_package_json_file({ "version" => "1.0.0", "babel" => { "presets" => ["path/to/my/preset"] } }) do
+        package_json = described_class.new
+
+        expect(package_json.delete!("babel")).to eq({ "presets" => ["path/to/my/preset"] })
+      end
+    end
+
+    context "when the property does not exist" do
+      it "does not error" do
+        package_json = described_class.new
+
+        expect { package_json.delete!("does not exist") }.not_to raise_error
+      end
+
+      it "returns nil" do
+        package_json = described_class.new
+
+        expect(package_json.delete!("does not exist")).to be_nil
+      end
+    end
+  end
 end