Revert "fix: disable import/export for typescript"

This reverts commit 1d9abb1.

Author: aminya

src/plugin-import-rules.js

@@ -19,10 +19,7 @@ exports.pluginImportTypeScriptRulesExtra = {
   // Buggy on TypeScript:
   "import/no-unresolved": "off",
   "import/named": "off",
-  // doesn't understand type namespaces
   "import/namespace": "off",
-  // thinks types are mutable!
-  "import/export": "off"
 }
 
 exports.pluginImportSettings = {