fix issues

frontend/config/polyfills.js

@@ -0,0 +1,4 @@
+'use strict';
+
+require('react-app-polyfill/ie9');
+require('react-app-polyfill/stable');

frontend/config/webpack.config.js

@@ -190,7 +190,7 @@ module.exports = function (webpackEnv) {
       // webpack uses `publicPath` to determine where the app is being served from.
       // It requires a trailing slash, or the file assets will get an incorrect path.
       // We inferred the "public path" (such as / or /my-project) from homepage.
-      output = Object.assign({}, output, {publicPath: "http://127.0.0.1:3000/assets/bundles/"});
+      output = Object.assign({}, output, {publicPath: "http://192.168.1.199:3000/assets/bundles/"});
     }
     return output;
   };

frontend/config/webpack.entry.js

@@ -40,6 +40,7 @@ const getEntries = (isEnvDevelopment) => {
   let entries = {};
   Object.keys(entryFiles).forEach(key => {
     let entry = [];
+    entry.push(require.resolve('./polyfills'));
     if (isEnvDevelopment) {
       entry.push(require.resolve('react-dev-utils/webpackHotDevClient'));
     }

frontend/package.json

@@ -23,6 +23,7 @@
     "prop-types": "^15.6.2",
     "raf": "3.4.0",
     "react": "^16.8.6",
+    "react-app-polyfill": "^2.0.0",
     "react-chartjs-2": "^2.8.0",
     "react-codemirror": "^1.0.0",
     "react-cookies": "^0.1.0",
@@ -53,12 +54,14 @@
     "production": [
       ">0.2%",
       "not dead",
-      "not op_mini all"
+      "not op_mini all",
+      "ie 11"
     ],
     "development": [
       "last 1 chrome version",
       "last 1 firefox version",
-      "last 1 safari version"
+      "last 1 safari version",
+      "ie 11"
     ]
   },
   "jest": {
@@ -143,7 +146,6 @@
     "postcss-preset-env": "6.7.0",
     "postcss-safe-parser": "5.0.2",
     "prompts": "2.4.0",
-    "react-app-polyfill": "^2.0.0",
     "react-dev-utils": "11.0.4",
     "react-refresh": "^0.8.3",
     "resolve": "1.18.1",