Revert ":alembic: this works well without sourcemap"

This reverts commit 5f5ddf3.

Author: byron

dash-renderer/MANIFEST.in

@@ -1,4 +1,4 @@
 include package.json
 include digest.json
 include dash_renderer/*.js
-exclude dash_renderer/*.map
+include dash_renderer/*.map

dash-renderer/init.template

@@ -42,4 +42,12 @@ _js_dist = [
         "/dash_renderer/dash_renderer.min.js",
         "namespace": "dash_renderer",
     },
+    {
+        "relative_package_path": "{}.min.js.map".format(__name__),
+        "dev_package_path": "{}.dev.js.map".format(__name__),
+        "external_url": "https://unpkg.com/dash-renderer@$version"
+        "/dash_renderer/dash_renderer.min.js.map",
+        "namespace": "dash_renderer",
+        "dynamic": True,
+    },
 ]

dash-renderer/webpack.config.js

@@ -32,13 +32,12 @@ module.exports = (env, argv) => {
             library: dashLibraryName,
             libraryTarget: 'window',
         },
-        // devtool: mode === 'development' ? 'source-map' : 'none',
-        devtool: 'none',
+        devtool: 'source-map',
         externals: {
             react: 'React',
             'react-dom': 'ReactDOM',
             'plotly.js': 'Plotly',
-            'prop-types': 'PropTypes',
+            'prop-types': 'PropTypes'
         },
         module: {
             rules: [
@@ -62,11 +61,12 @@ module.exports = (env, argv) => {
                 },
                 {
                     test: /\.svg$/,
-                    use: ['@svgr/webpack'],
+                    use: ['@svgr/webpack']
                 },
                 {
                     test: /\.txt$/i,
                     use: 'raw-loader',
+
                 },
             ],
         },