rollup-plugin not running on first preview build

[moonlitgrace]

so I've this config:

import { Config } from "@stencil/core";
import copy from 'rollup-plugin-copy';

export const config: Config = {
  namespace: "video-player",
  // other configs,
  rollupPlugins: {
    before: [
      copy({
        targets: [{
          src: '../../node_modules/webtorrent/dist/sw.min.js', dest: './www/'
        }],
        verbose: true,
      })
    ]
  }
};

and if I run: "start": "stencil build --dev --watch --serve"
It actually shows this:

> @coreproject-moe/[email protected] start
> stencil build --dev --watch --serve

[25:24.2]  @stencil/core
[25:25.2]  v4.23.0 🐣
[25:29.1]  build, video-player, dev mode, started ...
[25:29.2]  transpile started ...
[25:32.2]  transpile finished in 3.06 s
[25:32.2]  generate lazy + source maps started ...
copied:
  ../../node_modules/webtorrent/dist/sw.min.js → www/sw.min.js
[25:33.0]  generate lazy + source maps finished in 751 ms
[25:33.0]  copy started ...
[25:33.0]  copy finished (0 files) in 10 ms
[25:33.1]  build finished, watching for changes... in 3.91 s

But it doesn't get copied yet, not that the thing. If I make some change on code, it re-builds, that time it works (gets copied).
and I'm not sure if this is rollup-plugin-copy issue or stencil's.
any help is appreciated.

[christian-bromann]

But it doesn't get copied yet, not that the thing. If I make some change on code, it re-builds, that time it works (gets copied).

I am not quite sure if I understand this correctly, mind elaborate what you would expect and what is the actual behavior?

[moonlitgrace]

@christian-bromann, really sorry, I forgot to disable cleaning of www directory on preview build with (empty: false).
now that it makes sense :)