rollup.config.js

/* eslint-disable @typescript-eslint/no-var-requires */
/* eslint-disable no-undef */
import * as path from 'path';

import commonjs from '@rollup/plugin-commonjs';
import json from '@rollup/plugin-json';
import resolve from '@rollup/plugin-node-resolve';
import builtins from 'builtin-modules';
import { terser } from 'rollup-plugin-terser';
import typescript from 'rollup-plugin-typescript2';

const isProd = process.env.NODE_END === 'production';

const pkg = require(path.resolve('package.json'));

const input = pkg.entries || 'src/index.ts';

const plugins = [
    resolve(),
    commonjs(),
    json(),
    typescript({
        typescript: require('typescript'),
        clean: true,
        useTsconfigDeclarationDir: true,
    }),
];

export default {
    input,
    output: [
        output('cjs', 'main'),
        output('es', 'module'),
        output('umd', 'umd'),
    ],
    plugins,
    external: [...builtins],
};

function output(format, pkgKey) {
    if (pkg[pkgKey]) {
        return {
            dir: `dist/${format}`,
            name: 'ConcurrentTasks',
            globals: {
                '@concurrent-tasks/core': 'ConcurrentTasks',
            },
            format,
            sourcemap: !isProd,
            exports: 'auto',
            plugins: [
                isProd &&
                    terser({
                        mangle: false,
                        compress: isProd,
                        format: {
                            beautify: !isProd,
                        },
                    }),
            ],
        };
    }
}