rollup.config.js

import { builtinModules } from 'node:module';

import { tmpdir } from 'node:os';
import { join as pathJoin } from 'node:path';
import typescript from 'rollup-plugin-typescript2';

import pkg from './package.json';

const cacheRoot = pathJoin(tmpdir(), '.rpt2_cache');

const CORE_MODULE_RE = /(^_|\/)/;
const coreModules = builtinModules.filter(name => !CORE_MODULE_RE.test(name));

const src = pathJoin(__dirname, 'src');
const lib = pathJoin(__dirname, 'lib');

export default [
    {
        input: pathJoin(src, 'index.ts'),
        plugins: [
            typescript({
                cacheRoot,

                declarationDir: lib,

                tsconfigOverride: {
                    outDir: lib,
                    rootDir: src,
                    include: [src],
                },
            }),
        ],
        external: [...Object.keys(pkg.dependencies || {}), ...Object.keys(pkg.peerDependencies || {}), ...coreModules],
        output: [
            {
                file: pathJoin(lib, 'index.mjs'),
                format: 'esm',
            },
        ],
    },
];