have you tried postcss from jspm.dev? It works

[Ciantic]

Hello,

This is not a problem in your project, but I was experimenting with jspm, from which one can use e.g. react just fine like in Servest

I noticed that PostCSS with autoprefixer works also directly with Deno when ran through it:

postcsstest.js

import autoprefixer from "https://jspm.dev/autoprefixer";
import postcss from "https://jspm.dev/postcss";

postcss().use(autoprefixer).process(".something { appearance: none; }", {
    from: undefined
}).then(f => {
    console.log(f.css);
})

$ deno run .\postcsstest.js

.something { -webkit-appearance: none; -moz-appearance: none; appearance: none; }

So maybe no need to port the whole thing at least?