rollup.config.js

import resolve from "rollup-plugin-node-resolve";
import replace from "rollup-plugin-replace";
import commonjs from "rollup-plugin-commonjs";
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 dotenv from "dotenv";
import sveltePreprocess from "svelte-preprocess";

dotenv.config();

// fix trailing whitespace added by prettier
// https://github.com/sveltejs/svelte/issues/189
const tagsRegex1 = /(>)[\s]*([<{])/g;
const tagsRegex2 = /({[/:][a-z]+})[\s]*([<{])/g;
const tagsRegex3 = /({[#:][a-z]+ .+?})[\s]*([<{])/g;
const tagsRegex4 = /([>}])[\s]+(<|{[/#:][a-z][^}]*})/g;
const tagsReplace = "$1$2";

const markup = ({ content }) => ({
  code: content
    .replace(tagsRegex1, tagsReplace)
    .replace(tagsRegex2, tagsReplace)
    .replace(tagsRegex3, tagsReplace)
    .replace(tagsRegex4, tagsReplace),
});

const preprocess = {
  ...sveltePreprocess({
    scss: {
      includePaths: ["src", "node_modules"],
    },
  }),
  markup,
};

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

const environment = {
  "process.env.ADMIN_PATH": JSON.stringify(process.env.ADMIN_PATH || "/admin"),
  "process.env.APP_NAME": JSON.stringify(process.env.APP_NAME),
  "process.env.NODE_ENV": JSON.stringify(mode),
};

const onwarn = (warning, onwarn) =>
  (warning.code === "CIRCULAR_DEPENDENCY" &&
    /[/\\]@sapper[/\\]/.test(warning.message)) ||
  onwarn(warning);
const dedupe = (importee) =>
  importee === "svelte" || importee.startsWith("svelte/");

export default {
  client: {
    input: config.client.input(),
    output: config.client.output(),
    plugins: [
      replace({ ...environment, "process.browser": true }),
      svelte({
        preprocess,
        dev,
        hydratable: true,
        emitCss: true,
      }),
      resolve({
        browser: true,
        dedupe,
      }),
      commonjs(),

      legacy &&
        babel({
          extensions: [".js", ".mjs", ".html", ".svelte"],
          runtimeHelpers: true,
          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,
        }),
    ],

    onwarn,
  },

  server: {
    input: config.server.input(),
    output: config.server.output(),
    plugins: [
      replace({ ...environment, "process.browser": false }),
      svelte({
        preprocess,
        generate: "ssr",
        dev,
      }),
      resolve({
        dedupe,
      }),
      commonjs(),
    ],
    external: Object.keys(pkg.dependencies).concat(
      require("module").builtinModules ||
        Object.keys(process.binding("natives"))
    ),

    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()
    ],
    onwarn
  } */
};