rollup.config.ts

import { RollupOptions } from "rollup";
import resolve from "rollup-plugin-node-resolve";
import commonjs from "rollup-plugin-commonjs";
import sourceMaps from "rollup-plugin-sourcemaps";
import camelCase from "lodash.camelcase";
import typescript from "rollup-plugin-typescript2";
import json from "@rollup/plugin-json";

import pkg from "./package.json" assert { type: "json" };

const libraryName = "underlords";

const bundle: RollupOptions = {
	input: `src/${libraryName}.ts`,
	output: [
		{
			file: pkg.main,
			name: camelCase(libraryName),
			format: "umd",
			sourcemap: true,
		},
		{ file: pkg.module, format: "es", sourcemap: true },
	],
	// Indicate here external modules you don't wanna include in your bundle (i.e.: 'lodash')
	external: [],
	watch: {
		include: "src/**",
	},
	plugins: [
		// Allow json resolution
		json(),
		// Compile TypeScript files
		typescript({ useTsconfigDeclarationDir: true }),
		// Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
		commonjs(),
		// Allow node_modules resolution, so you can use 'external' to control
		// which external modules to include in the bundle
		// https://github.com/rollup/rollup-plugin-node-resolve#usage
		resolve(),

		// Resolve source maps to the original source
		sourceMaps(),
	],
};

export default bundle;