import { readFileSync } from 'node:fs';

/**
 * Bundler plugin that lets `.md` / `.yaml` files be imported as raw strings:
 *
 *   import description from './grep.md';
 *
 * The file content is inlined into the bundle at build time, so prompt
 * source files never ship separately in `dist`. Shared by tsdown (build)
 * and vitest (test) so both resolve these imports identically.
 */
export function rawTextPlugin() {
  return {
    name: 'raw-text',
    enforce: 'pre',
    load(id) {
      const path = id.split('?', 1)[0] ?? id;
      if (!path.endsWith('.md') && !path.endsWith('.yaml')) return null;
      const text = readFileSync(path, 'utf-8');
      return { code: `export default ${JSON.stringify(text)};`, map: null };
    },
  };
}