🤖 config(fixpack): Update or create .fixpackrc.

These changes were automatically generated by a transform whose code can be found at:
  - https://github.com/make-github-pseudonymous-again/rejuvenate/blob/a44c42967442d65fd14272682fb84a6f32feb841/src/transforms/fixpack:configure.js
Please contact the author of the transform if you believe there was an error.

.fixpackrc

@@ -23,6 +23,7 @@
     "source",
     "main",
     "module",
+    "esmodule",
     "umd:main",
     "unpkg",
     "exports",