nomyo-js/rollup.config.mjs

import typescript from '@rollup/plugin-typescript';
import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';

const target = process.env.TARGET || 'node';

const config = {
    input: target === 'browser' ? 'src/browser.ts' : 'src/node.ts',
    plugins: [
        resolve(),
        commonjs(),
        typescript({
            tsconfig: './tsconfig.json',
            declaration: false,
            declarationDir: undefined
        })
    ]
};

// Extensions are explicit rather than bare `.js`: the package is not
// "type": "module", so Node treats a .js file as CommonJS. An ES-format bundle
// named .js therefore fails to import on Node < 22, and only works above that
// because Node re-parses it after guessing — at a cost on every import.
if (target === 'node') {
    config.output = [
        {
            file: 'dist/node/index.js',
            format: 'cjs',
            exports: 'named'
        },
        {
            file: 'dist/esm/index.mjs',
            format: 'es',
            // The source loads several modules lazily via require(): the crypto
            // fallback, fs/path for key persistence, the optional native addon,
            // and jose. `require` does not exist in ES module scope, so without
            // this shim an ESM consumer crashes with "require is not defined"
            // the moment one of those paths runs. Node-only output, so
            // node:module is safe here.
            banner: "import { createRequire as __nomyoCreateRequire } from 'node:module';\n"
                + 'const require = __nomyoCreateRequire(import.meta.url);'
        }
    ];
    config.external = ['crypto', 'https', 'fs', 'path'];
} else if (target === 'browser') {
    config.output = [
        {
            file: 'dist/browser/index.mjs',
            format: 'es',
            name: 'Nomyo'
        },
        {
            file: 'dist/browser/index.cjs',
            format: 'cjs',
            exports: 'named',
            name: 'Nomyo'
        }
    ];
}

export default config;