Doesn't compile CSS of all .vue files on repeated (in memory) invocation

[duzun]

I use browserSync and rollup in a gulp live command to watch for file changes and compile JS automatically. My JS imports a bunch of .vue files and rollup-plugin-vue is collectiong all CSS from all components in vue/vue.css file.
On first run everything is good.

Expected behavior

It should gather all CSS from all .vue components in one vue/vue.css file on each run inside a persistent process.

Actual behavior

On the second and consequent runs inside the same process, it collects CSS from only one .vue component.

Steps to reproduce the behavior

I run gulp-better-rollup with the following plugins:

   let plugins = [
        // require('rollup-plugin-strip')(),
        require('rollup-plugin-json')(),
        require('rollup-plugin-node-resolve')({
            jsnext: true,
            main: true
        }),
        require('rollup-plugin-commonjs')({
            extensions: [ '.js', '.json', '.vue' ],
            namedExports: {
                'perfect-scrollbar': ['initialize', 'update', 'destroy'],
            }
        }),
        require('rollup-plugin-vue')({
            css: './vue/vue.css'
        }),
        require('rollup-plugin-babel')(bo),
    ];

multiple time inside the same process for the same source files.

[znck]

I want to support incremental/subsequent builds. I would be doing this early next month. If anyone want to pick up, you're most welcome.

Related #67