// rollup.config.ts
import type { Plugin, RollupOptions } from 'rollup';
import { nodeResolve } from '@rollup/plugin-node-resolve';

const cdnRewritePlugin: Plugin = {
  name: 'rewrite-lodash-to-cdn',
  resolveId(id) {
    if (id === 'lodash-es') {
      return 'https://esm.sh/lodash-es@5';
    }
    if (id.startsWith('lodash-es/')) {
      const [, sub] = id.split('/', 2);
      return `https://esm.sh/lodash-es@5/${sub}`;
    }
    return null;
  },
};

const config: RollupOptions = {
  input: 'src/index.ts',
  output: {
    dir: 'dist',
    format: 'esm',
  },
  plugins: [cdnRewritePlugin, nodeResolve({ browser: true })],
  external(id) {
    return id.startsWith('https://');
  },
};

export default config;