Excel is a powerful and extremely versatile application, but one thing that really SUCKS about it, is that formulas are language-specific! So if using Outlook in - for example - Swedish you can't write "IF(<expression>,<then>,<else>)" but instead "OM(<expression>;<then>;<else>)". Note the semi-colon instead of comma (because in Swedish comma is used as decimal). AAARGGH! This pisses me off!

a "configurable" confirmation system, where page conditions (e.g. customerId=someId, etc.) are stored in the DB as a comma separated string to be run through a stack expression evaluator, so that customers can add a "confirmation" (aka just a modal dialog) with custom reminder text when a user does a certain thing on a certain page....

What do you guys think about the comma expression in JavaScript? I'm aware that due to it's (to some) unknown nature that it can lead to subtle bugs, but I have at least one good use case for it and wanted to hear reasons why I shouldn't use it for similar use cases, but also what would be some other cool (not necessarily "good") use cases :D

What's the minimal feature set that can make a language as ornamented as JS into a comfortable REPL?
Should I write a full parser or should I try to patch my way around with regex?
It will have to interface a lot with JS so it has to be able to manage JS datastructures in some fashion, which means that I can't just make a whole new command line with its own programs.

My current plan:
Some delimiter (probably a semicolon) will take the output of a command and inject it in the next in case you decide halfway through a line to do some more processing, It also awaits promises and does some other nice stuff to make controlling such pipelines easy. I have an elaborate system in mind to decide where a value must be injected to make the line valid so in most cases you don't even have to indicate it. JS has beautifully simple syntax rules so I have a lot of technical balance to burn before I start building technical debt.

I have some ideas for automatic parentheses and commas in function calls. I realize while using a command line you do not want to tap shift often. My main idea here is that two names or values in js are always joined by an operator so the first missing operator is a call and following missing operators are commas until the end of line. This has lots of nasty edge cases though, like that no argument expression can begin with a unary operator or a bracket of any shape. You can always prepend a comma but it's cognitive load.

Anyway, do you have any suggestion or warning besides "js bad" which I know but it's the most popular sandboxable language and has a massive existing set of libraries which I kinda need.