dotenv-cli | A cli to load dotenv files | Command Line Interface library

The problem is that when you call from PowerShell (unlike from cmd.exe), the command name dotenv resolves to a PowerShell script, namely dotenv.ps1, as you report.

When PowerShell calls a PowerShell-native command - including .ps1 files - its own parameter binder interprets the (first) -- argument and removes it; that is, the target command never sees it. (The semantics of -- is analogous to that of Unix utilities: -- tells the parameter binder to treat subsequent arguments as positional ones, even if they look like parameter (option) names, such as -foo.)

Thus, unfortunately, you need to specify -- twice in order to pass a single -- instance through to the .ps1 script itself:

Uncaught TypeError: Cannot read properties of undefined (reading 'string')

I believe the issue is where you are declaring your proptypes for StarRating.

Solved it: my .zshrc did contain this entry:

OK, I figured out the issue. I thought the error was telling me that path was undefined. When it fact it was saying the variables passed into path.join() were undefined. And that was because I forgot to add in my .env file to the root so it could grab those variables. Whoops!

It seems that your issue is related to this. Currently there's an issue with Node.js version 12.19.0 that Heroku uses and there's a dependency named undici that's causing the issue. It should work if you try it with Node 14 in Heroku.