rollup.config.mjs

import resolve from '@rollup/plugin-node-resolve';
import commonjs from '@rollup/plugin-commonjs';
import { readdirSync } from 'node:fs';
import { join } from 'node:path';

// collect all language files from src/lang
const langDir = 'src/lang';
const langInputs = readdirSync(langDir)
  .filter((f) => f.endsWith('.js'))
  .map((f) => join(langDir, f));

// Rollup configuration for building core + language bundles
export default [
  // Core library bundles
  {
    input: 'src/validator.js',
    output: [
      { file: 'dist/index.cjs', format: 'cjs', exports: 'default' },
      { file: 'dist/index.esm.js', format: 'esm' },
      { name: 'Validator', file: 'dist/validator.umd.js', format: 'umd' }
    ],
    plugins: [
      resolve(),
      commonjs({
        dynamicRequireTargets: [
          // include using a glob pattern (either a string or an array of strings)
          'src/lang/*.js',
        ],
      }),
    ],
  },
  // Language bundles (one file per language)
  {
    input: langInputs,
    output: [
      {
        dir: 'dist/lang',
        format: 'cjs',
        preserveModules: true,
        entryFileNames: '[name].js',
      },
      {
        dir: 'dist/lang',
        format: 'esm',
        preserveModules: true,
        entryFileNames: '[name].mjs',
      },
    ],
    plugins: [resolve(), commonjs()],
  }
];