[app-vite - SSR] Quasar doesn't transpile ||= for Safari 13.1

[gustavotoyota]

I'm trying to support Safari 13.1 that comes with macOS Catalina, but the browser is throwing some Syntax errors for ||= and public class fields.
The default Vite build target is ['es2019', 'edge88', 'firefox78', 'chrome87', 'safari13.1'], so I think Quasar should be transpiling correctly for Safari 13.1.
It looks like transpilation is occurring in some files (like index.19b930b6.js) but not others.

I tried changing the build target. I also tried using @vitejs/plugin-legacy without success.

Any help is appreciated, thanks.