upgrade babel 7.7.2 and upgrade react-hot-loader

package.json

@@ -7,17 +7,17 @@
     "url": "git://github.com/getsentry/sentry.git"
   },
   "dependencies": {
-    "@babel/core": "~7.4.4",
-    "@babel/plugin-proposal-class-properties": "~7.4.4",
-    "@babel/plugin-proposal-decorators": "~7.4.4",
-    "@babel/plugin-proposal-object-rest-spread": "~7.4.4",
+    "@babel/core": "~7.7.2",
+    "@babel/plugin-proposal-class-properties": "~7.7.0",
+    "@babel/plugin-proposal-decorators": "~7.7.0",
+    "@babel/plugin-proposal-object-rest-spread": "~7.6.2",
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
-    "@babel/plugin-transform-runtime": "~7.4.4",
-    "@babel/polyfill": "~7.4.4",
-    "@babel/preset-env": "~7.4.4",
-    "@babel/preset-react": "^7.0.0",
-    "@babel/preset-typescript": "^7.3.3",
-    "@babel/runtime": "~7.4.4",
+    "@babel/plugin-transform-runtime": "~7.6.2",
+    "@babel/polyfill": "~7.7.0",
+    "@babel/preset-env": "~7.7.1",
+    "@babel/preset-react": "^7.7.0",
+    "@babel/preset-typescript": "^7.7.2",
+    "@babel/runtime": "~7.7.2",
     "@sentry/browser": "5.7.0-beta.1",
     "@sentry/integrations": "5.6.0-beta.4",
     "@types/classnames": "^2.2.0",
@@ -98,7 +98,7 @@
     "react-document-title": "2.0.3",
     "react-dom": "16.7.0",
     "react-emotion": "9.2.12",
-    "react-hot-loader": "4.11.1",
+    "react-hot-loader": "4.12.16",
     "react-keydown": "^1.9.7",
     "react-lazyload": "^2.3.0",
     "react-lottie": "^1.2.3",
@@ -118,8 +118,8 @@
     "svg-sprite-loader": "^3.9.0",
     "svgo": "^1.0.3",
     "svgo-loader": "^2.1.0",
-    "ts-loader": "^6.0.4",
-    "typescript": "^3.5.2",
+    "ts-loader": "^6.2.1",
+    "typescript": "3.5.2",
     "u2f-api": "1.0.10",
     "webpack": "^4.28.1",
     "webpack-cli": "^3.1.2",

src/sentry/static/sentry/app/components/events/interfaces/spans/utils.tsx

@@ -285,7 +285,7 @@ export const setBodyUserSelect = (nextValues: UserSelectValues): UserSelectValue
     msUserSelect: document.body.style.msUserSelect,
   };
 
-  document.body.style.userSelect = nextValues.userSelect;
+  document.body.style.userSelect = nextValues.userSelect || '';
   // MozUserSelect is not typed in TS
   // @ts-ignore
   document.body.style.MozUserSelect = nextValues.MozUserSelect;