The recently added on-the-fly transpiling support is very inefficient (hence it being whitelisted on a per-domain basis), and quite honestly overkill for what's needed here: transpiling only nullish coalescing and optional chaining. Babel doesn't seem to support this in the proper way.
As noted on the MSFN forums, there is probably a more efficient way to approach this:
The recently added on-the-fly transpiling support is very inefficient (hence it being whitelisted on a per-domain basis), and quite honestly overkill for what's needed here: transpiling only nullish coalescing and optional chaining. Babel doesn't seem to support this in the proper way.
As noted on the MSFN forums, there is probably a more efficient way to approach this:
Ideally, the transpiling should only analyze for these operators and nothing else.