rollup.config.js

import package_ from './package.json' with { type: 'json' };
import typescript from 'rollup-plugin-typescript2';
import dts from 'rollup-plugin-dts';
import cleanup from 'rollup-plugin-cleanup';
import del from 'rollup-plugin-delete';
import { externals } from 'rollup-plugin-node-externals';

/** @type {import('rollup').RollupOptions} */
export default [
    {
        input: './src/index.ts',
        output: [
            {
                file: package_.exports.import,
                format: 'module',
            },
            {
                file: package_.exports.require,
                format: 'commonjs',
            },
        ],
        plugins: [
            // Delete contents of target folder
            del({
                targets: package_.files,
            }),

            // Compile source (typescript) to javascript
            typescript({
                tsconfig: './tsconfig.json',
            }),

            // Remove things like comments and whitespace
            cleanup({
                extensions: ['.ts', '.js'],
            }),

            /**
             * Mark all dependencies as external to prevent Rollup from
             * including them in the bundle. We'll let the package manager
             * take care of dependency resolution so we don't have to
             * download the exact same code multiple times. Once in this
             * bundle and as a dependency of another package.
             */
            externals(),
        ],
    },

    {
        input: './src/index.ts',
        output: [
            {
                file: package_.types,
            },
        ],
        plugins: [
            // Generate types (.d.ts)
            dts(),
        ],
    },
];