chore(): karma does not fail when global thresholds not met

coverage/index.html

@@ -93,7 +93,7 @@ <h1>
 </div><!-- /wrapper -->
 <div class='footer quiet pad2 space-top1 center small'>
   Code coverage
-  generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Thu Nov 14 2019 10:54:56 GMT-0800 (Pacific Standard Time)
+  generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Thu Nov 14 2019 11:13:41 GMT-0800 (Pacific Standard Time)
 </div>
 </div>
 <script src="prettify.js"></script>

karma.conf.js

@@ -16,7 +16,7 @@ module.exports = config => {
       plugins: [
         // load plugin
         require.resolve('@open-wc/karma-esm'),
-    
+
         // fallback: resolve any karma- plugins
         'karma-*',
       ],
@@ -28,6 +28,12 @@ module.exports = config => {
         // if you are using 'bare module imports' you will need this option
         nodeResolve: true,
       },
+
+      coverageIstanbulReporter: {
+        thresholds: {
+          emitWarning: true
+        }
+      }
     }),
   );
   return config;

package.json

@@ -29,6 +29,7 @@
     "deepmerge": "^4.2.2",
     "es-dev-server": "^1.18.4",
     "karma": "^4.4.1",
+    "karma-threshold-reporter": "^0.1.15",
     "rollup": "^1.26.0",
     "rollup-plugin-babel-minify": "^9.1.1",
     "rollup-plugin-minify-html-literals": "^1.2.2",