rollup.config.js

import babel from 'rollup-plugin-babel';
import commonjs from 'rollup-plugin-commonjs';
import nodeResolve from 'rollup-plugin-node-resolve';
import replace from 'rollup-plugin-replace';
import sourceMaps from 'rollup-plugin-sourcemaps';
import {terser} from 'rollup-plugin-terser';

import pkg from './package.json';

export default ['development', 'production'].map((environment) => ({
    input: `./src/index.js`,
    output: {
        format: 'cjs',
        sourcemap: true,
        globals: {
            'react': 'React',
            'react-dom': 'ReactDOM',
            'react-dom/server': 'ReactDOMServer',
        },
        file: [
            'dist/isoreact-bacon.cjs',
            environment === 'production' && 'min',
            'js',
        ]
            .filter(Boolean)
            .join('.'),
    },
    plugins: [
        sourceMaps(),
        nodeResolve(),
        babel({runtimeHelpers: true}),
        commonjs(),
        replace({
            'process.env.NODE_ENV': `"${environment}"`,
        }),
        environment === 'production' && terser(),
    ]
        .filter(Boolean),
    external: [
        // Top-level peerDependencies modules
        ...Object.keys(pkg.peerDependencies),

        // Submodules of peerDependencies
        'react-dom/server',
        'rxjs/operators',

        // Node modules
        'crypto',
        'os',
        'util',
    ],
}));