diff --git a/.gitignore b/.gitignore
index b1d505a2b..d069eef06 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,9 +58,6 @@ rat-results.txt
 *.js.map
 node_modules
 npm-debug.log*
-superset-frontend/coverage/*
-superset-frontend/cypress/screenshots
-superset-frontend/cypress/videos
 superset/static/assets
 superset/static/version_info.json
 yarn-error.log
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1d8571acd..cef83d11c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -528,7 +528,7 @@ best practices.
 
 Superset supports a server-wide feature flag system, which eases the incremental development of features. To add a new feature flag, simply modify `superset_config.py` with something like the following:
 
-```
+```python
 FEATURE_FLAGS = {
     'SCOPED_FILTER': True,
 }
@@ -536,7 +536,7 @@ FEATURE_FLAGS = {
 
 If you want to use the same flag in the client code, also add it to the FeatureFlag TypeScript enum in `superset-frontend/src/featureFlags.ts`. For example,
 
-```
+```typescript
 export enum FeatureFlag {
   SCOPED_FILTER = 'SCOPED_FILTER',
 }
diff --git a/superset-frontend/.eslintignore b/superset-frontend/.eslintignore
index 25b08e052..e21e918be 100644
--- a/superset-frontend/.eslintignore
+++ b/superset-frontend/.eslintignore
@@ -25,5 +25,6 @@ stylesheets/*
 vendor/*
 docs/*
 src/dashboard/deprecated/*
+src/temp/*
 **/node_modules
 *.d.ts
diff --git a/superset-frontend/.gitignore b/superset-frontend/.gitignore
new file mode 100644
index 000000000..0598bbb0b
--- /dev/null
+++ b/superset-frontend/.gitignore
@@ -0,0 +1,4 @@
+coverage/*
+cypress/screenshots
+cypress/videos
+src/temp
diff --git a/superset-frontend/package-lock.json b/superset-frontend/package-lock.json
index 5421f93fb..291151c82 100644
--- a/superset-frontend/package-lock.json
+++ b/superset-frontend/package-lock.json
@@ -24728,9 +24728,9 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
     "typescript": {
-      "version": "3.5.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.5.3.tgz",
-      "integrity": "sha512-ACzBtm/PhXBDId6a6sDJfroT2pOWt/oOnk4/dElG5G33ZL776N3Y6/6bKZJBFpd+b05F3Ct9qDjMeJmRWtE2/g==",
+      "version": "3.8.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.2.tgz",
+      "integrity": "sha512-EgOVgL/4xfVrCMbhYKUQTdF37SQn4Iw73H5BgCrF1Abdun7Kwy/QZsE/ssAy0y4LxBbvua3PIbFsbRczWWnDdQ==",
       "dev": true
     },
     "typpy": {
diff --git a/superset-frontend/package.json b/superset-frontend/package.json
index f51844979..01c8cd337 100644
--- a/superset-frontend/package.json
+++ b/superset-frontend/package.json
@@ -220,7 +220,7 @@
     "ts-jest": "^24.0.2",
     "ts-loader": "^5.4.5",
     "tslib": "^1.10.0",
-    "typescript": "^3.5.3",
+    "typescript": "^3.8.2",
     "url-loader": "^1.0.1",
     "webpack": "^4.19.0",
     "webpack-assets-manifest": "^3.0.1",
diff --git a/superset-frontend/spec/javascripts/utils/safeStringify_spec.ts b/superset-frontend/spec/javascripts/utils/safeStringify_spec.ts
index acf7748f1..21ea64765 100644
--- a/superset-frontend/spec/javascripts/utils/safeStringify_spec.ts
+++ b/superset-frontend/spec/javascripts/utils/safeStringify_spec.ts
@@ -19,7 +19,7 @@
 import { safeStringify } from '../../../src/utils/safeStringify';
 
 class Noise {
-  public next: Noise;
+  public next?: Noise;
 }
 
 describe('Stringify utility testing', () => {
diff --git a/superset-frontend/webpack.config.js b/superset-frontend/webpack.config.js
index b45a958a5..c7a957a9f 100644
--- a/superset-frontend/webpack.config.js
+++ b/superset-frontend/webpack.config.js
@@ -281,7 +281,7 @@ const config = {
     hot: true,
     index: '', // This line is needed to enable root proxying
     inline: true,
-    stats: { colors: true },
+    stats: 'minimal',
     overlay: true,
     port: devserverPort,
     // Only serves bundled files from webpack-dev-server