Enable code coverage statistics

Author: ali-ince

.babelrc

@@ -5,6 +5,13 @@
     ]
   ],
   "plugins": [
-    "@babel/plugin-transform-runtime"
-  ]
+    "@babel/plugin-transform-runtime",
+  ],
+  "env": {
+    "test": {
+      "plugins": [
+        "istanbul"
+      ]
+    }
+  }
 }

.gitignore

@@ -11,4 +11,8 @@ node_modules
 docs/build
 .npmrc
 *.iml
-/lib
+/lib
+.nyc_output
+coverage
+.vscode
+*.code-workspace

.nycrc

@@ -0,0 +1,4 @@
+{
+    "extends": "@istanbuljs/nyc-config-babel",
+    "reporter": ["text", "lcov"]
+}