Properly use babel to fix IE11 support

Signed-off-by: Julius Härtl <jus@bitgrid.net>

js/package-lock.json

@@ -717,6 +717,133 @@
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@@ -747,6 +874,383 @@
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+        "babel-plugin-check-es2015-constants": "^6.22.0",
+        "babel-plugin-syntax-trailing-function-commas": "^6.22.0",
+        "babel-plugin-transform-async-to-generator": "^6.22.0",
+        "babel-plugin-transform-es2015-arrow-functions": "^6.22.0",
+        "babel-plugin-transform-es2015-block-scoped-functions": "^6.22.0",
+        "babel-plugin-transform-es2015-block-scoping": "^6.23.0",
+        "babel-plugin-transform-es2015-classes": "^6.23.0",
+        "babel-plugin-transform-es2015-computed-properties": "^6.22.0",
+        "babel-plugin-transform-es2015-destructuring": "^6.23.0",
+        "babel-plugin-transform-es2015-duplicate-keys": "^6.22.0",
+        "babel-plugin-transform-es2015-for-of": "^6.23.0",
+        "babel-plugin-transform-es2015-function-name": "^6.22.0",
+        "babel-plugin-transform-es2015-literals": "^6.22.0",
+        "babel-plugin-transform-es2015-modules-amd": "^6.22.0",
+        "babel-plugin-transform-es2015-modules-commonjs": "^6.23.0",
+        "babel-plugin-transform-es2015-modules-systemjs": "^6.23.0",
+        "babel-plugin-transform-es2015-modules-umd": "^6.23.0",
+        "babel-plugin-transform-es2015-object-super": "^6.22.0",
+        "babel-plugin-transform-es2015-parameters": "^6.23.0",
+        "babel-plugin-transform-es2015-shorthand-properties": "^6.22.0",
+        "babel-plugin-transform-es2015-spread": "^6.22.0",
+        "babel-plugin-transform-es2015-sticky-regex": "^6.22.0",
+        "babel-plugin-transform-es2015-template-literals": "^6.22.0",
+        "babel-plugin-transform-es2015-typeof-symbol": "^6.23.0",
+        "babel-plugin-transform-es2015-unicode-regex": "^6.22.0",
+        "babel-plugin-transform-exponentiation-operator": "^6.22.0",
+        "babel-plugin-transform-regenerator": "^6.22.0",
+        "browserslist": "^3.2.6",
+        "invariant": "^2.2.2",
+        "semver": "^5.3.0"
+      },
+      "dependencies": {
+        "browserslist": {
+          "version": "3.2.8",
+          "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-3.2.8.tgz",
+          "integrity": "sha512-WHVocJYavUwVgVViC0ORikPHQquXwVh939TaelZ4WDqpWgTX/FsGhl/+P4qBUAGcRvtOgDgC+xftNWWp2RUTAQ==",
+          "dev": true,
+          "requires": {
+            "caniuse-lite": "^1.0.30000844",
+            "electron-to-chromium": "^1.3.47"
+          }
+        },
+        "electron-to-chromium": {
+          "version": "1.3.49",
+          "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.49.tgz",
+          "integrity": "sha1-ZROEsNgfB4qWY5srNpdRQbeRUAQ=",
+          "dev": true
+        },
+        "semver": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
+          "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA==",
+          "dev": true
+        }
+      }
+    },
     "babel-register": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-register/-/babel-register-6.26.0.tgz",
@@ -1347,6 +1851,12 @@
       "integrity": "sha1-VahuQCx0rhcUlwe+o+o5lSIjNJc=",
       "dev": true
     },
+    "caniuse-lite": {
+      "version": "1.0.30000856",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000856.tgz",
+      "integrity": "sha512-x3mYcApHMQemyaHuH/RyqtKCGIYTgEA63fdi+VBvDz8xUSmRiVWTLeyKcoGQCGG6UPR9/+4qG4OKrTa6aSQRKg==",
+      "dev": true
+    },
     "caseless": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.11.0.tgz",
@@ -6960,6 +7470,17 @@
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       "dev": true
     },
+    "regenerator-transform": {
+      "version": "0.10.1",
+      "resolved": "https://registry.npmjs.org/regenerator-transform/-/regenerator-transform-0.10.1.tgz",
+      "integrity": "sha512-PJepbvDbuK1xgIgnau7Y90cwaAmO/LCLMI2mPvaXq2heGMR3aWW5/BQvYrhJ8jgmQjXewXvBjzfqKcVOmhjZ6Q==",
+      "dev": true,
+      "requires": {
+        "babel-runtime": "^6.18.0",
+        "babel-types": "^6.19.0",
+        "private": "^0.1.6"
+      }
+    },
     "regex-not": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/regex-not/-/regex-not-1.0.2.tgz",

js/package.json

@@ -22,13 +22,14 @@
   "devDependencies": {
     "babel-core": "^6.26.0",
     "babel-loader": "^7.1.2",
+    "babel-preset-env": "^1.7.0",
     "css-loader": "^0.28.9",
+    "karma": "^2.0.3",
     "mini-css-extract-plugin": "^0.4.0",
     "node-sass": "^4.5.3",
     "webpack": "^4.12.0",
     "webpack-cli": "^3.0.8",
-    "webpack-merge": "^4.1.3",
+    "webpack-merge": "^4.1.3"
-    "karma": "^2.0.3"
   },
   "scripts": {
     "build": "./node_modules/webpack-cli/bin/cli.js --mode production --config webpack.prod.config.js",

js/webpack.config.js

@@ -22,6 +22,9 @@ module.exports = {
         test: /\.js$/,
         exclude: /node_modules/,
         loader: 'babel-loader',
+        query: {
+          presets: ['env'],
+        }
       },
       {
         test: /\.css$/,