diff --git a/karma.conf.js b/karma.conf.js
index 965318a2..ef030702 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -86,6 +86,12 @@ module.exports = function init(config) {
         served: true,
         included: false,
       },
+      {
+        pattern: './dist/pipeline.worker.js',
+        watched: true,
+        served: true,
+        included: false,
+      },
       {
         pattern: './src/UI/reference-ui/dist/referenceUIMachineOptions.js',
         watched: true,
diff --git a/src/index.d.ts b/src/index.d.ts
index 18c11a34..d47ea87f 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -7,7 +7,7 @@ declare type ndarray = {
   _rtype: 'ndarray'
 }
 
-declare type LoadableImage = URL | Image | Store | ndarray
+declare type LoadableImage = URL | Store | ndarray | Image
 
 declare type ViewerOptions = {
   image?: LoadableImage
@@ -20,7 +20,7 @@ declare type ViewerOptions = {
 
 type Viewer = {
   setBackgroundColor(color: [number, number, number]): void
-  setImageColorMap(mapName: string, actor: number): void
+  setImageColorMap(mapName: string, actor?: number): void
 }
 
 declare namespace itkVtkViewer {
@@ -51,3 +51,6 @@ declare namespace itkVtkViewer {
 
   type version = string
 }
+
+export as namespace itkVtkViewer
+export = itkVtkViewer
diff --git a/src/itkConfig.js b/src/itkConfig.js
index fd4f0a09..5a711f96 100644
--- a/src/itkConfig.js
+++ b/src/itkConfig.js
@@ -1,8 +1,8 @@
 const itkConfig = {
-  pipelineWorkerUrl: __webpack_public_path__ + 'itk/web-workers/min-bundles/pipeline.worker.js', // eslint-disable-line no-undef
-  imageIOUrl: __webpack_public_path__ + 'itk/image-io', // eslint-disable-line no-undef
-  meshIOUrl: __webpack_public_path__ + 'itk/mesh-io', // eslint-disable-line no-undef
-  pipelinesUrl: __webpack_public_path__ + 'itk/pipeline', // eslint-disable-line no-undef
+  pipelineWorkerUrl: 'pipeline.worker.js',
+  imageIOUrl: 'itk/image-io',
+  meshIOUrl: 'itk/mesh-io',
+  pipelinesUrl: 'itk/pipeline',
 }
 
 export default itkConfig
diff --git a/webpack.config.js b/webpack.config.js
index 7089a0a4..a6fd0681 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -73,6 +73,7 @@ module.exports = (env, argv) => [
     devtool: argv.mode === 'development' ? 'eval-source-map' : 'source-map',
     output: {
       filename: 'itkVtkViewer.js',
+      publicPath: '',
     },
     resolve: {
       alias: {
@@ -94,6 +95,18 @@ module.exports = (env, argv) => [
             ),
             to: path.join(__dirname, 'dist', 'itk', 'web-workers'),
           },
+          {
+            from: path.join(
+              __dirname,
+              'node_modules',
+              'itk-wasm',
+              'dist',
+              'web-workers',
+              'min-bundles',
+              'pipeline.worker.js'
+            ),
+            to: path.join(__dirname, 'dist', 'pipeline.worker.js'),
+          },
           {
             from: path.join(__dirname, 'node_modules', 'itk-image-io'),
             to: path.join(__dirname, 'dist', 'itk', 'image-io'),