rollup.config.js

import { spawn } from "child_process";
import svelte from "rollup-plugin-svelte";
import commonjs from "@rollup/plugin-commonjs";
import terser from "@rollup/plugin-terser";
import resolve from "@rollup/plugin-node-resolve";
import livereload from "rollup-plugin-livereload";
import css from "rollup-plugin-css-only";
import sveltePreprocess from "svelte-preprocess";
import typescript from "rollup-plugin-typescript2";
import postcss from "rollup-plugin-postcss";
import fs from "fs-extra";

const copyFilePlugin = (sourceDir, targetDir) => {
  return {
    name: "copy-file",
    buildStart() {
      fs.copy(sourceDir, targetDir, { overwrite: true }, (err) => {
        if (err) return console.error(err);
        console.log(`${sourceDir} copied successfully!`);
      });
    },
  };
};

const production = !process.env.ROLLUP_WATCH;

function serve() {
  let server;

  function toExit() {
    if (server) server.kill(0);
  }

  return {
    writeBundle() {
      if (server) return;
      server = spawn("npm", ["run", "start", "--", "--dev"], {
        stdio: ["ignore", "inherit", "inherit"],
        shell: true,
      });

      process.on("SIGTERM", toExit);
      process.on("exit", toExit);
    },
  };
}

export default [
  {
    input: "src/background/background.ts",
    output: {
      sourcemap: false,
      format: "iife",
      name: "app",
      file: "public/build/background.js",
    },
    plugins: [
      typescript({ sourceMap: false }),
      resolve(),
      commonjs(),
      production && terser(),
    ],
    watch: {
      clearScreen: false,
    },
  },
  {
    input: "src/content/content.ts",
    output: {
      sourcemap: false,
      format: "iife",
      name: "app",
      file: "public/build/content.js",
    },
    plugins: [
      typescript({ sourceMap: false }),
      resolve(),
      commonjs(),
      production && terser(),
    ],
    watch: {
      clearScreen: false,
    },
  },
  {
    input: "src/content/content.css",
    output: {
      sourcemap: false,
      file: "public/build/content.css",
    },
    plugins: [
      postcss({
        extract: true,
        minimize: production,
      }),
    ],
  },
  {
    input: "src/main.ts",
    output: {
      sourcemap: false,
      format: "iife",
      name: "app",
      file: "public/build/bundle.js",
    },
    plugins: [
      svelte({
        preprocess: sveltePreprocess({ sourceMap: false }),
        compilerOptions: {
          // enable run-time checks when not in production
          dev: !production,
        },
      }),
      postcss({
        extract: true,
        minimize: true,
        use: [
          [
            "sass",
            {
              includePaths: ["./src/theme", "./node_modules"],
            },
          ],
        ],
      }),
      // we'll extract any component CSS out into
      // a separate file - better for performance
      css({ output: "bundle.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"],
        exportConditions: ["svelte"],
      }),
      typescript({
        sourceMap: false,
        inlineSources: !production,
      }),
      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(),
      copyFilePlugin("src/manifest.json", "public/manifest.json"),
      copyFilePlugin("src/icons", "public/icons"),
      copyFilePlugin("src/_locales", "public/_locales"),
      copyFilePlugin("src/index.html", "public/index.html"),
    ],
    watch: {
      clearScreen: false,
    },
  },
];