SPA in this context would likely mean Single Page App. A Javascript module, to be run in a browser.

I agree that posters need to be careful about undefined acronyms, but, pro-tip, you can always check Wikipedia for overloaded terms to narrow down to the right one. Here it will give you a section for the meanings in the context of computing:

https://en.wikipedia.org/wiki/SPA

Edit: also, I suspect you’re being cheeky there, because when I Google “SPA”, the top results are local spas (even in private mode), and thus not “places to go for a holiday/vacation”, as if you only guessed what a Google search would give and had decided to make a joke about the ambiguity and most common lay meaning of (case-insensitive) SPA, rather than express an actual frustration at an honest attempt to look up the meaning of that term.

There's more than one technical meaning. One is web-related and another is cryptography-related. All possibly relevant.

Yes, the other one is a small stub article about a proprietary Microsoft protocol for authenticating email logins.

https://en.wikipedia.org/wiki/Secure_Password_Authentication

I guess that’s what led you to “keep googling” the same term over and over?

If you include a context word like "web" it pops right up.

I tried a bunch of additional keywords before asking. I also did think of "Single Page App" but I doubted how it could be relevant.