rollup.config.js

import babel from 'rollup-plugin-babel';
import { nodeResolve } from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import webWorkerLoader from 'rollup-plugin-web-worker-loader';

const pkg = require('./package.json');

export default {
    input: pkg.module,
    output: {
        name: pkg.name
            .split('-')
            .map((str,i) =>
                i === 0 ?
                    str :
                    (str.substring(0,1).toUpperCase() + str.substring(1))
            )
            .join(''),
        file: pkg.main,
        format: 'umd',
        globals: {
            d3: 'd3',
        },
    },
    external: ['d3'],
    plugins: [
        babel({
            exclude: 'node_modules/**',
            presets: [
                [ '@babel/preset-env' ]
            ],
            babelrc: false
        }),
        nodeResolve(),
        commonjs(),
        webWorkerLoader({
            targetPlatform: 'browser',
        }),
    ]
};