rollup.config.js

import babel from "rollup-plugin-babel";
import commonjs from "rollup-plugin-commonjs";
import resolve from "rollup-plugin-node-resolve";
import replace from "rollup-plugin-replace";
import { terser } from "rollup-plugin-terser";
import sourcemaps from "rollup-plugin-sourcemaps";
import builtins from "rollup-plugin-node-builtins";
import globals from "rollup-plugin-node-globals";
import json from "rollup-plugin-json";
import gzipPlugin from "rollup-plugin-gzip";
import brotli from "rollup-plugin-brotli";
import visualizer from "rollup-plugin-visualizer";
import * as webPackage from "./package.json";
import * as npmPackage from "./dist/rudder-sdk-js/package.json";

let distFileName = "";
let { version } = webPackage;
let moduleType = "web";
switch (process.env.ENV) {
  case "prod":
    switch (process.env.ENC) {
      case "gzip":
        if (process.env.PROD_DEBUG_INLINE == "true") {
          distFileName = "dist/rudder-analytics-map.min.gzip.js";
        } else {
          distFileName = "dist/rudder-analytics.min.gzip.js";
        }
        break;
      case "br":
        if (process.env.PROD_DEBUG_INLINE == "true") {
          distFileName = "dist/rudder-analytics-map.min.br.js";
        } else {
          distFileName = "dist/rudder-analytics.min.br.js";
        }
        break;
      default:
        if (process.env.PROD_DEBUG_INLINE == "true") {
          distFileName = "dist/rudder-analytics-map.min.js";
        } else {
          distFileName = "dist/rudder-analytics.min.js";
        }
        break;
    }
    break;
  default:
    distFileName = "dist/browser.js";
    break;
}

const outputFiles = [];
if (process.env.NPM == "true") {
  outputFiles.push({
    file: "dist/rudder-sdk-js/index.js",
    format: "umd",
    name: "rudderanalytics",
  });
  version = npmPackage.version;
  moduleType = "npm";
} else {
  outputFiles.push({
    file: distFileName,
    format: "iife",
    name: "rudderanalytics",
    sourcemap:
      process.env.PROD_DEBUG_INLINE == "true"
        ? "inline"
        : !!process.env.PROD_DEBUG,
  });
}

export default {
  input: "analytics.js",
  external: ["Xmlhttprequest", "universal-analytics"],
  output: outputFiles,
  plugins: [
    sourcemaps(),
    replace({
      "process.browser": process.env.NODE_ENV != "true",
      "process.prod": process.env.ENV == "prod",
      "process.package_version": version,
      "process.module_type": moduleType,
    }),
    resolve({
      jsnext: true,
      browser: true,
      preferBuiltins: false,
    }),

    commonjs({
      include: "node_modules/**",
      /* namedExports: {
        // left-hand side can be an absolute path, a path
        // relative to the current directory, or the name
        // of a module in node_modules
        Xmlhttprequest: ["Xmlhttprequest"]
      } */
    }),

    json(),
    globals(),
    builtins(),

    babel({
      exclude: ["node_modules/@babel/**", "node_modules/core-js/**"],
      presets: [
        [
          "@babel/env",
          {
            corejs: "3.6",
            useBuiltIns: "entry",
            targets: {
              edge: "15",
              firefox: "40",
              ie: "10",
              chrome: "37",
              safari: "7",
              opera: "23",
            },
          },
        ],
      ],
      plugins: [
        [
          "@babel/plugin-proposal-class-properties",
          {
            loose: true,
          },
        ],
        ["@babel/plugin-transform-arrow-functions"],
        ["@babel/plugin-transform-object-assign"],
      ],
    }),
    process.env.uglify === "true" && terser(),
    process.env.ENC === "gzip" && gzipPlugin(),
    process.env.ENC === "br" && brotli(),
    process.env.visualizer === "true" &&
      process.env.uglify === "true" &&
      visualizer({ sourcemap: true }),
  ],
};