fix devtools warnings

Author: dmitry.levkovskiy

_develop/webpack.config.js

@@ -78,6 +78,12 @@ const tsRules = {
   ],
 };
 
+const sourceMapRules = {
+  test: /\.js$/,
+  enforce: 'pre',
+  use: ['source-map-loader'],
+};
+
 const baseConfig = {
   mode: 'development',
   context: path.resolve(__dirname, '..'),
@@ -107,7 +113,7 @@ const baseConfig = {
     extensions: ['.js', '.styl', '.ts'],
   },
   module: {
-    rules: [jsRules, stylRules, tsRules],
+    rules: [jsRules, stylRules, tsRules, sourceMapRules],
     noParse: [
       /\/node_modules\/clone\/clone\.js$/,
       /\/node_modules\/eventemitter3\/index\.js$/,

package-lock.json

@@ -67,6 +67,7 @@
     "prettier": "^1.17.0",
     "puppeteer": "^2.1.1",
     "rimraf": "^3.0.2",
+    "source-map-loader": "^1.1.2",
     "style-loader": "~1.1.3",
     "stylus": "~0.54.7",
     "stylus-loader": "^3.0.2",