Re-enable the useDefineForClassFields flag

Author: sindresorhus

tsconfig.json

@@ -19,8 +19,7 @@
 		"noFallthroughCasesInSwitch": true,
 		"noUncheckedIndexedAccess": true,
 		"noEmitOnError": true,
-		// Disabled because of TS bugs: https://github.com/sindresorhus/tsconfig/issues/7
-		// "useDefineForClassFields": true,
+		"useDefineForClassFields": true,
 		"forceConsistentCasingInFileNames": true,
 		"skipLibCheck": true
 	}