from the readme:

Default behaviour is to write all styles to the bundle destination where .js is replaced by .css

but style.js bails if there is no destination string:

https://github.com/znck/rollup-plugin-vue/blob/master/src/style.js#L33-L35

if (typeof dest !== 'string') {
    return
}

with defaults (no css option), i do not get a css file; i would like to get it