diff --git a/js/demo/testing/view/AmplitudeModulatorDemoNode.js b/js/demo/testing/view/AmplitudeModulatorDemoNode.ts
similarity index 100%
rename from js/demo/testing/view/AmplitudeModulatorDemoNode.js
rename to js/demo/testing/view/AmplitudeModulatorDemoNode.ts
diff --git a/js/demo/testing/view/CompositeSoundClipTestNode.js b/js/demo/testing/view/CompositeSoundClipTestNode.ts
similarity index 100%
rename from js/demo/testing/view/CompositeSoundClipTestNode.js
rename to js/demo/testing/view/CompositeSoundClipTestNode.ts
diff --git a/js/demo/testing/view/ContinuousPropertySoundGeneratorTestNode.js b/js/demo/testing/view/ContinuousPropertySoundGeneratorTestNode.ts
similarity index 100%
rename from js/demo/testing/view/ContinuousPropertySoundGeneratorTestNode.js
rename to js/demo/testing/view/ContinuousPropertySoundGeneratorTestNode.ts
diff --git a/js/demo/testing/view/RemoveAndDisposeSoundGeneratorsTestPanel.js b/js/demo/testing/view/RemoveAndDisposeSoundGeneratorsTestPanel.ts
similarity index 100%
rename from js/demo/testing/view/RemoveAndDisposeSoundGeneratorsTestPanel.js
rename to js/demo/testing/view/RemoveAndDisposeSoundGeneratorsTestPanel.ts
diff --git a/js/demo/testing/view/SoundClipChordTestNode.js b/js/demo/testing/view/SoundClipChordTestNode.ts
similarity index 100%
rename from js/demo/testing/view/SoundClipChordTestNode.js
rename to js/demo/testing/view/SoundClipChordTestNode.ts
diff --git a/js/demo/testing/view/TestingScreenView.js b/js/demo/testing/view/TestingScreenView.ts
similarity index 100%
rename from js/demo/testing/view/TestingScreenView.js
rename to js/demo/testing/view/TestingScreenView.ts