Unless I'm mistaken, file transformers cannot be async, right?

If that's the case, it's quite unfortunate because it means that one has to chose between async or caching but can't have both?

For example: I want to have a gobble plugin for imagemin. Since optimizing is onerous and a 1-to-1 op, I'd rather use a file transform.

But imagemin processors are async so it's a no go 😞

So this is my request for making file transformers async just like directory transformers.
I think it would make gobble much more powerful.