Workers: Error when an undefined value is exported in dev environment

[transbitch]

If you export a variable that is undefined from your entry script, Miniflare produces:

MiniflareCoreError [ERR_RUNTIME_FAILURE]: The Workers runtime failed to start. There is likely additional logging output above.

✘ [ERROR] service core:user:myproject: Uncaught TypeError: Cannot initialize a dictionary with required members from an undefined or null value.

Note that there is no error thrown when actually deploying and using in production, or when testing with --remote.

NB. In my case, the fact the script was exporting an undefined value was a byproduct of my build process (with vite)