update check-ts-errors

Author: xyzqm

package.json

@@ -164,7 +164,7 @@
     "format": "prettier --write .",
     "lint": "npm run eslint",
     "eslint": "eslint --fix --ext .jsx --ext .js --ext .ts --ext .tsx --cache src",
-    "check-ts-errors": "tsc --noEmit --strict false",
+    "check-ts-errors": "tsc --noEmit --strictNullChecks false",
     "start": "npm run develop",
     "serve": "gatsby serve",
     "clean": "gatsby clean",

tsconfig.json

@@ -11,6 +11,7 @@
     "module": "esnext",
     "moduleResolution": "node",
     "skipLibCheck": true,
-    "strict": false // match check-ts-errors
+    "strict": false, // match check-ts-errors
+    "strictNullChecks": true
   }
 }