Fix the type linting command to actually check the relevant types

Disabling the checks for lib files will hide typescript errors in the
stylelint type definitions, as those are loaded as a lib type when
type-checking type-test.ts

tsconfig.json

@@ -15,7 +15,7 @@
 		"noUncheckedIndexedAccess": true,
 		"esModuleInterop": true,
 		"resolveJsonModule": true,
-		"skipLibCheck": true,
+		"skipLibCheck": false,
 		"typeRoots": ["./types", "./node_modules/@types"]
 	},
 	"include": ["lib", "types", "package.json"],