import svelte from 'rollup-plugin-svelte';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
// import autoPreprocess from 'svelte-preprocess';
import postcss from 'rollup-plugin-postcss';
// import livereload from 'rollup-plugin-livereload';
import { terser } from 'rollup-plugin-terser';

const production = !process.env.ROLLUP_WATCH;

export default {
  input: 'js/main.js',
  output: {
    sourcemap: true,
    format: 'iife',
    name: 'app',
    file: '../priv/static/js/app.js'
  },
  plugins: [
    postcss(),

    svelte({
      // preprocess: autoPreprocess(),
      // enable run-time checks when not in production
      dev: !production,
      // we'll extract any component CSS out into
      // a separate file - better for performance
      css: css => {
        css.write('../priv/static/css/app.css');
      }
    }),

    // If you have external dependencies installed from
    // npm, you'll most likely need these plugins. In
    // some cases you'll need additional configuration -
    // consult the documentation for details:
    // https://github.com/rollup/plugins/tree/master/packages/commonjs
    resolve({
      browser: true,
      dedupe: ['svelte']
    }),
    commonjs(),

    // In dev mode, call `npm run start` once
    // the bundle has been generated
    // !production && serve(),

    // Watch the `public` directory and refresh the
    // browser on changes when not in production
    // !production && livereload('public'),

    // If we're building for production (npm run build
    // instead of npm run dev), minify
    production && terser()
  ],
  watch: {
    clearScreen: false
  }
};