Update to TypeScript 4

.eslintrc.yml

@@ -76,6 +76,13 @@ rules:
     - 1
     - "line-aligned"
   "react/jsx-closing-tag-location": 1
+  # This setup is required to avoid a spam of errors when running eslint about React being
+  # used before it is defined.
+  #
+  # see https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-use-before-define.md#how-to-use
+  no-use-before-define: 0
+  "@typescript-eslint/no-use-before-define":
+    - warn
 overrides:
   - files:
       - "**/*.tsx"