rollup.config.js

const fs = require('fs');
const path = require('path');
const babel = require('rollup-plugin-babel');
const cleaner = require('rollup-plugin-cleaner');
const external = require('rollup-plugin-peer-deps-external');
const postcss = require('rollup-plugin-postcss');
const commonjs = require('@rollup/plugin-commonjs');
const resolve = require('@rollup/plugin-node-resolve');
const { ifProd } = require('./utils/env');

const srcPath = (...p) => path.resolve.apply(undefined, [__dirname, 'src', ...p].filter(Boolean));
const libPath = (...p) => path.resolve.apply(undefined, [__dirname, 'lib', ...p].filter(Boolean));

module.exports = (name) => {
    const indexFile = fs.readdirSync(srcPath(name)).find(f => f.startsWith('index.'));
    return {
        input: srcPath(name, indexFile),
        output: [{
            dir: libPath(name),
            format: 'cjs',
            sourceMap: true
        }],
        plugins: [
            external(),
            postcss({
                modules: {
                    camelCase: true,
                    generateScopedName: '[hash:base64]',
                },
                minimize: false,
                extensions: ['.css', '.scss']
            }),
            resolve({
                extensions: ['.js', '.jsx', '.ts', '.tsx'],
            }),
            babel({
                exclude: '**/node_modules/**',
                extensions: ['.js', '.jsx', '.ts', '.tsx'],
                runtimeHelpers: true,
            }),
            commonjs(),
            ifProd(cleaner({
                targets: [
                    libPath(name)
                ],
            }))
        ].filter(Boolean),
        external: [
            'part:@sanity/base/client',
            'part:@sanity/base/document-badges',
            'part:@sanity/base/schema',
            'part:@sanity/base/datastore/document',
            'part:@sanity/base/document-actions',
            '@sanity/desk-tool/lib/pane/PaneItem',
            '@sanity/desk-tool/structure-builder',
            '@sanity/state-router/lib/components/IntentLink'
        ]
    };
};