tsup.config.ts

import { defineConfig, type Options } from 'tsup';

interface BundleOptions {
  dev?: boolean;
  node?: boolean;
}

function options({ dev, node }: BundleOptions): Options {
  return {
    entry: {
      [node ? 'node' : dev ? 'dev' : 'prod']: 'src/index.ts',
    },
    outDir: 'dist',
    treeshake: true,
    bundle: true,
    format: node ? 'cjs' : 'esm',
    // minify: true,
    platform: node ? 'node' : 'browser',
    target: node ? 'node16' : 'esnext',
    define: {
      __DEV__: dev ? 'true' : 'false',
      __TEST__: 'false',
    },
    esbuildOptions(opts) {
      opts.mangleProps = !dev ? /^_/ : undefined;
    },
  };
}

export default defineConfig([
  options({ dev: true }), // dev
  options({ dev: false }), // prod
  options({ node: true }), // server
]);