rollup.config.js

import path from "path";
import resolve from "@rollup/plugin-node-resolve";
import replace from "@rollup/plugin-replace";
import commonjs from "@rollup/plugin-commonjs";
import url from "@rollup/plugin-url";
import svelte from "rollup-plugin-svelte";
import babel from "@rollup/plugin-babel";
import { terser } from "rollup-plugin-terser";
import config from "sapper/config/rollup.js";
import pkg from "./package.json";
import json from "@rollup/plugin-json";

const mode = process.env.NODE_ENV;
const dev = mode === "development";
const legacy = !!process.env.SAPPER_LEGACY_BUILD;

const onwarn = (warning, onwarn) =>
  (warning.code === "MISSING_EXPORT" && /'preload'/.test(warning.message)) ||
  (warning.code === "CIRCULAR_DEPENDENCY" &&
    /[/\\]@sapper[/\\]/.test(warning.message)) ||
  onwarn(warning);

export default {
  client: {
    input: config.client.input(),
    output: config.client.output(),
    plugins: [
      json(),
      replace({
        "process.browser": true,
        "process.env.NODE_ENV": JSON.stringify(mode),
      }),
      svelte({
        dev,
        hydratable: true,
        emitCss: true,
      }),
      url({
        sourceDir: path.resolve(__dirname, "src/node_modules/images"),
        publicPath: "/client/",
      }),
      resolve({
        browser: true,
        dedupe: ["svelte"],
      }),
      commonjs(),

      legacy &&
        babel({
          extensions: [".js", ".mjs", ".html", ".svelte"],
          babelHelpers: "runtime",
          exclude: ["node_modules/@babel/**"],
          presets: [
            [
              "@babel/preset-env",
              {
                targets: "> 0.25%, not dead",
              },
            ],
          ],
          plugins: [
            "@babel/plugin-syntax-dynamic-import",
            [
              "@babel/plugin-transform-runtime",
              {
                useESModules: true,
              },
            ],
          ],
        }),

      !dev &&
        terser({
          module: true,
        }),
    ],

    preserveEntrySignatures: false,
    onwarn,
  },

  server: {
    input: config.server.input(),
    output: config.server.output(),
    plugins: [
      json(),
      replace({
        "process.browser": false,
        "process.env.NODE_ENV": JSON.stringify(mode),
      }),
      svelte({
        generate: "ssr",
        hydratable: true,
        dev,
      }),
      url({
        sourceDir: path.resolve(__dirname, "src/node_modules/images"),
        publicPath: "/client/",
        emitFiles: false, // already emitted by client build
      }),
      resolve({
        dedupe: ["svelte"],
      }),
      commonjs(),
    ],
    external: Object.keys(pkg.dependencies).concat(
      require("module").builtinModules
    ),

    preserveEntrySignatures: "strict",
    onwarn,
  },

  // serviceworker: {
  // 	input: config.serviceworker.input(),
  // 	output: config.serviceworker.output(),
  // 	plugins: [
  // 		resolve(),
  // 		replace({
  // 			'process.browser': true,
  // 			'process.env.NODE_ENV': JSON.stringify(mode)
  // 		}),
  // 		commonjs(),
  // 		!dev && terser()
  // 	],

  // 	preserveEntrySignatures: false,
  // 	onwarn,
  // }
};