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 { terser } from 'rollup-plugin-terser'
import { dependencies, exports, optionalDependencies, peerDependencies, unpkg } from './package.json'

export default process.env.NODE_ENV === 'cjs'
    ? {
        input: 'src/index.js',
        external: new RegExp(`^(${
            Object.keys({
                ...dependencies,
                ...optionalDependencies,
                ...peerDependencies,
            }).join('|')})`),
        output: {
            file: exports['.'].require,
            format: 'cjs',
        },
        plugins: [
            babel({ babelHelpers: 'runtime' }),
            commonjs(),
        ],
    }
    : {
        external: ['@cdoublev/animate', 'react', 'prop-types'],
        input: 'src/index.js',
        output: {
            file: unpkg,
            format: 'umd',
            globals: {
                '@cdoublev/animate': 'animate',
                'prop-types': 'PropTypes',
                'react': 'React',
            },
            name: 'ReactUtils',
        },
        plugins: [
            replace({ 'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV) }),
            nodeResolve(),
            babel({ babelHelpers: 'bundled' }),
            commonjs(),
            terser(),
        ],
    }