Upgrade to babel 7

.babelrc

 {
-  "presets": [["latest", { "es2015": { "modules": false } }], "stage-2"],
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "modules": false,
+        "targets": {
+          "ie": "11"
+        }
+      }
+    ]
+  ],
+  "plugins": [
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-syntax-import-meta",
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-json-strings"
+  ],
   "env": {
     "karma": {
-      "plugins": ["rewire"]
+      "plugins": ["babel-plugin-rewire"]
     },
     "coverage": {
       "plugins": [
         [
-          "istanbul",
+          "babel-plugin-istanbul",
           {
             "exclude": ["spec/javascripts/**/*", "app/assets/javascripts/locale/**/app.js"]
           }
         ],
         [
-          "transform-define",
+          "babel-plugin-transform-define",
           {
             "process.env.BABEL_ENV": "coverage"
           }
         ],
-        "rewire"
+        "babel-plugin-rewire"
       ]
     }
   }

package.json

@@ -18,15 +18,18 @@
     "webpack-prod": "NODE_ENV=production webpack --config config/webpack.config.js"
   },
   "dependencies": {
+    "@babel/core": "^7.1.2",
+    "@babel/plugin-proposal-class-properties": "^7.1.0",
+    "@babel/plugin-proposal-json-strings": "^7.0.0",
+    "@babel/plugin-syntax-dynamic-import": "^7.0.0",
+    "@babel/plugin-syntax-import-meta": "^7.0.0",
+    "@babel/preset-env": "^7.1.0",
     "@gitlab-org/gitlab-svgs": "^1.29.0",
     "@gitlab-org/gitlab-ui": "^1.7.1",
     "autosize": "^4.0.0",
     "axios": "^0.17.1",
-    "babel-core": "^6.26.3",
-    "babel-loader": "^7.1.5",
+    "babel-loader": "^8.0.4",
     "babel-plugin-transform-define": "^1.3.0",
-    "babel-preset-latest": "^6.24.1",
-    "babel-preset-stage-2": "^6.24.1",
     "blackst0ne-mermaid": "^7.1.0-fixed",
     "bootstrap": "4.1.1",
     "brace-expansion": "^1.1.8",
@@ -111,7 +114,7 @@
   "devDependencies": {
     "axios-mock-adapter": "^1.15.0",
     "babel-eslint": "^9.0.0",
-    "babel-plugin-istanbul": "^5.0.1",
+    "babel-plugin-istanbul": "^5.1.0",
     "babel-plugin-rewire": "^1.2.0",
     "babel-template": "^6.26.0",
     "babel-types": "^6.26.0",
@@ -135,7 +138,7 @@
     "jasmine-jquery": "^2.1.1",
     "karma": "^3.0.0",
     "karma-chrome-launcher": "^2.2.0",
-    "karma-coverage-istanbul-reporter": "^1.4.2",
+    "karma-coverage-istanbul-reporter": "^2.0.4",
     "karma-jasmine": "^1.1.2",
     "karma-junit-reporter": "^1.2.0",
     "karma-mocha-reporter": "^2.2.5",