shareon/rollup.config.js

import { join, resolve } from "path";

import buble from "@rollup/plugin-buble";
import strip from "@rollup/plugin-strip";
import postcss from "rollup-plugin-postcss";
import { terser } from "rollup-plugin-terser";

const autoprefixer = require("autoprefixer");
const banner = require("postcss-banner");
const calc = require("postcss-calc");
const cssnano = require("cssnano");
const cssVariables = require("postcss-css-variables");

const pkg = require("./package.json");

const isDev =
  process.env.ROLLUP_WATCH || process.env.NODE_ENV === "development";
const outputDir = resolve(".", "dist");
const bannerText = `${pkg.name} v${pkg.version}`;

const postcssPlugins = [cssVariables, calc];

if (!isDev) {
  postcssPlugins.push(
    cssnano({
      preset: "default",
    }),
    autoprefixer(),
    banner({
      banner: bannerText,
      important: true,
      inline: true,
    })
  );
}

const getPlugins = (css) => [
  css &&
    postcss({
      extract: resolve(join(outputDir, "shareon.min.css")),
      plugins: postcssPlugins,
    }),
  !isDev &&
    strip({
      debugger: true,
      include: ["**/*.js"],
      functions: ["console.log", "console.debug", "assert.*"],
      sourceMap: false,
    }),
  !isDev &&
    buble({
      transforms: {
        modules: false,
      },
    }),
];

const getOutput = (baseDir) => {
  const defaultParameters = {
    name: pkg.name,
    exports: "default",
  };

  return [
    {
      ...defaultParameters,
      format: "iife",
      file: join(baseDir, `${pkg.name}${isDev ? "" : ".min"}.js`),
      plugins: isDev ? [] : [terser({ output: { comments: /^!/ } })],
      banner: `/*! ${bannerText} */`,
    },
    !isDev && {
      ...defaultParameters,
      format: "cjs",
      file: join(baseDir, `${pkg.name}.cjs`),
      banner: `/*! ${bannerText} */`,
    },
    !isDev && {
      ...defaultParameters,
      format: "esm",
      file: join(baseDir, `${pkg.name}.mjs`),
      banner: `/*! ${bannerText} */`,
    },
  ];
};

export default {
  input: join(__dirname, "src", "index.js"),
  output: getOutput(outputDir),
  plugins: getPlugins(true),
};