import from core.ts instead of pure.ts whenever possible.

tsconfig.json

@@ -9,10 +9,10 @@
     "skipLibCheck": true,
     "esModuleInterop": true,
     "emitDeclarationOnly": true,
+    "allowImportingTsExtensions": true,
     "outDir": "lib/types",
     "resolveJsonModule": true,
     "rootDir": ".",
-    "allowImportingTsExtensions": true,
     "types": ["bun-types"]
   }
 }