catch pkg undefined error when using realImport and use realRequire i…

…nstead

lib/transport-stream.js

@@ -24,15 +24,16 @@ async function loadTransportStreamBuilder (target) {
       }
       // TODO: Support ES imports once tsc, tap & ts-node provide better compatibility guarantees.
       fn = realRequire(decodeURIComponent(target))
-    } else if (toLoad.endsWith('.js')) {
-      fn = realRequire(decodeURIComponent(target))
     } else {
       fn = (await realImport(toLoad))
     }
   } catch (error) {
     // See this PR for details: https://github.com/pinojs/thread-stream/pull/34
     if ((error.code === 'ENOTDIR' || error.code === 'ERR_MODULE_NOT_FOUND')) {
       fn = realRequire(target)
+    } else if (error.code === undefined) {
+      // When bundled with pkg, an undefined error is thrown when called with realImport
+      fn = realRequire(decodeURIComponent(target))
     } else {
       throw error
     }