rollup.config.js

import fs from 'fs'
import babel from '@rollup/plugin-babel'
import json from '@rollup/plugin-json'
import resolve from '@rollup/plugin-node-resolve'
import terser from '@rollup/plugin-terser'
import cleanup from 'rollup-plugin-cleanup'

const pkg = process.env.PACKAGE
const env = process.env.NODE_ENV ?? 'development'

// The config assumes rollup -c is invoked from a package/${pkg} directory
// The build commands assume they are executed from the root directory
process.chdir('../../')

const extensions = ['.js', '.jsx', '.es6', '.es', '.mjs', '.ts', '.tsx']
const babelConfig = {
    extensions,
    exclude: /node_modules/,
    babelHelpers: 'bundled',
    comments: false,
    plugins: [],
}

let input = './packages/' + pkg + '/src/index.tsx'
if (!fs.existsSync(input)) {
    input = input.replace('.tsx', '.ts')
}

const commonPlugins = [
    resolve({
        module: true,
        jsnext: true,
        main: true,
        browser: true,
        extensions,
        modulesOnly: true,
    }),
    json(),
    babel(babelConfig),
    terser({ mangle: { keep_fnames: env === 'development' } }),
    cleanup(),
]

// ignore warning about circular dependencies in d3-interpolate
const D3_WARNING = /Circular dependency.*d3-interpolate/

const commonConfig = {
    input,
    external: [
        'react',
        'react-dom',
        'react/jsx-runtime',
        'framer-motion',
        'd3-scale',
        'd3-shape',
        'd3-scale-chromatic',
        'd3-interpolate',
        'lodash',
    ],
    plugins: commonPlugins,
    onwarn: function (message) {
        if (D3_WARNING.test(message)) {
            return
        }
    },
}

const configs = [
    {
        ...commonConfig,
        output: {
            file: `./packages/${pkg}/dist/chsk-${pkg}.es.js`,
            format: 'es',
            name: `@chsk/${pkg}`,
            sourcemap: true,
        },
    },
    {
        ...commonConfig,
        output: {
            file: `./packages/${pkg}/dist/chsk-${pkg}.umd.js`,
            format: 'umd',
            name: `@chsk/${pkg}`,
            sourcemap: true,
        },
    },
]

export default configs