How does it actually work ?

[MarcWeber]

I love macros, too.
I hacked my own solution like this:

/* MACRO HERE blah */  /* MACRO END */

And writing a regex based preprocessor which fills in the code
So locations are correct, but I have all the verbose output in my files.
Some editors like Vim allow to collapse regions so ..

But would you mind explaining how your implementation works ?

If you want to use vite whatever .. who and when is responsible for doing the macro expansion ?
Environments ?
node, deno, esbuild, rollup, webpack, ....

But you made me think whether abusing providing own
implementation for 'import' would work, too.
But imports must be async or must be found at top of file.
So again no perfect solution.