Downgraded Typescript

Downgraded typescript due to an issue with Typescript 4.1+ being present with CRA 4.0 . For more information, check this page facebook/create-react-app#10110

package.json

@@ -14,7 +14,7 @@
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
     "react-scripts": "4.0.0",
-    "typescript": "^4.2.4",
+    "typescript": "^3.9.7",
     "web-vitals": "^0.2.4"
   },
   "scripts": {

tsconfig.json

@@ -18,7 +18,7 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": true,
-    "jsx": "react-jsx"
+    "jsx": "react"
   },
   "include": [
     "src"

yarn.lock

@@ -11383,10 +11383,10 @@
   "resolved" "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz"
   "version" "0.0.6"
 
-"typescript@^3.2.1", "typescript@^4.2.4", "typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta":
-  "integrity" "sha512-V+evlYHZnQkaz8TRBuxTA92yZBPotr5H+WhQ7bD3hZUndx5tGOa1fuCgeSjxAzM1RiN5IzvadIXTVefuuwZCRg=="
-  "resolved" "https://registry.npmjs.org/typescript/-/typescript-4.2.4.tgz"
-  "version" "4.2.4"
+"typescript@^3.2.1", "typescript@^3.9.7", "typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta":
+  "integrity" "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw=="
+  "resolved" "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz"
+  "version" "3.9.7"
 
 "unicode-canonical-property-names-ecmascript@^1.0.4":
   "integrity" "sha512-jDrNnXWHd4oHiTZnx/ZG7gtUTVp+gCcTTKr8L0HjlwphROEW3+Him+IpvC+xcJEFegapiMZyZe02CyuOnRmbnQ=="