How to exclude a css file from a requireJS build?

I am using requireJS to minify js and css files for a wordpress theme, however I want the style.css to be ignored when requireJS builds the optimized theme as the optimized theme folder is supposed to have another style.css file.

My app.build.js file looks like this:

({
appDir: "../",
baseUrl: "js",
dir: "../../target/",
modules: [
    {
        name: "main"
    }
],
paths: {
    [...]
},
shim: {
    [...]
}
})

I have previously tried to add the following to no avail:

fileExclusionRegExp: /^style$/,