Move babel config for instanbul to karma config (!9286)

1 files changed, 11 insertions, 0 deletions

diff --git a/config/karma.config.js b/config/karma.config.js
index a1fbeab1f46..a16e2d2077f 100644
--- a/config/karma.config.js
+++ b/config/karma.config.js
@@ -2,6 +2,17 @@ var path = require('path');
 var webpackConfig = require('./webpack.config.js');
 var ROOT_PATH = path.resolve(__dirname, '..');
 
+// add coverage instrumentation to babel config
+if (webpackConfig && webpackConfig.module && webpackConfig.module.rules) {
+  var babelConfig = webpackConfig.module.rules.find(function (rule) {
+    return rule.loader === 'babel-loader';
+  });
+
+  babelConfig.options = babelConfig.options || {};
+  babelConfig.options.plugins = babelConfig.options.plugins || [];
+  babelConfig.options.plugins.push('istanbul');
+}
+
 // Karma configuration
 module.exports = function(config) {
   config.set({