diff --git a/js/.npmignore b/js/.npmignore
new file mode 100644
index 00000000..7cc8b59f
--- /dev/null
+++ b/js/.npmignore
@@ -0,0 +1,4 @@
+scripts
+webpack.config.js
+lab-dist
+.eslintrc.js
diff --git a/js/scripts/generate-wrappers.js b/js/scripts/generate-wrappers.js
index 37ec50c6..01d03ef0 100644
--- a/js/scripts/generate-wrappers.js
+++ b/js/scripts/generate-wrappers.js
@@ -590,12 +590,15 @@ function writeJavascriptIndexFiles() {
 
     console.log('Writing javascript indices...');
 
+    const dotSlash = '.' + path.sep;
+
     const excludes = [
         /\.swp$/,
         /\.DS_Store$/,
         /index\.js$/,
-        './embed.js',
-        './extension.js',
+        dotSlash + 'embed.js',
+        dotSlash + 'extension.js',
+        dotSlash + path.join('examples', '.eslintrc.js'),
     ];
 
     // Regexp's
@@ -610,7 +613,7 @@ function writeJavascriptIndexFiles() {
 
         // get proper relative path for file
         dirFiles = dirFiles.map(filename => {
-            return './' + path.join(dirPath, filename);
+            return dotSlash + path.join(dirPath, filename);
         });
 
         // filter excluded files
diff --git a/js/webpack.config.js b/js/webpack.config.js
index aa465539..fd56695a 100644
--- a/js/webpack.config.js
+++ b/js/webpack.config.js
@@ -39,7 +39,6 @@ module.exports = [
             library: "jupyter-threejs",
             libraryTarget: 'amd'
         },
-        devtool: 'source-map',
         externals: ['@jupyter-widgets/base'],
         resolve: {
             extensions: [ ".autogen.js", ".js" ]