rollup.config.js

import resolve from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import json from "@rollup/plugin-json";
import babel from "rollup-plugin-babel";
import { terser } from "rollup-plugin-terser";
import { eslint } from "rollup-plugin-eslint";
import typescript from "rollup-plugin-typescript2";
import sourceMaps from "rollup-plugin-sourcemaps";

import pkg from "./package.json";
const isDev = process.env.NODE_ENV !== "production";

export default {
	input: "src/index.ts",
	external: ["express", "get-port", "glob", "fs"],
	plugins: [
		resolve({
			browser: true,
			preferBuiltins: true
		}),
		commonjs(),
		sourceMaps(),
		json(),
		typescript({
			exclude: "node_modules/**",
			typescript: require("typescript")
		}),
		eslint({
			throwOnError: true,
			throwOnWarning: true,
			include: ["src/**"],
			exclude: ["node_modules/**"]
		}),
		babel({
			exclude: "node_modules/**",
			runtimeHelpers: true
		}),
		!isDev && terser()
	],
	output: [
		{
			file: pkg.main,
			format: "cjs",
			sourcemap: isDev ? true : false
		},
		{ file: pkg.module, format: "esm", sourcemap: isDev ? true : false }
	]
};