Function collectDtsFiles

apps/site/scripts/twoslash-fsmap/generate.mjs:20–37

* Recursively collects all `.d.ts` files from a directory into the fsMap. * * @param {Map } fsMap The map to populate * @param {string} dir The directory to walk * @param {string} virtualPrefix The virtual path prefix (e.g., "/node_modules/@types/node") * @param {string} baseDir

(fsMap, dir, virtualPrefix, baseDir)

 * @param {string} baseDir The base directory for computing relative paths
 */
function collectDtsFiles(fsMap, dir, virtualPrefix, baseDir) {
  const entries = readdirSync(dir, { withFileTypes: true }).sort((a, b) =>
    a.name.localeCompare(b.name)
  );

  for (const entry of entries) {
    const fullPath = join(dir, entry.name);

    if (entry.isDirectory()) {
      collectDtsFiles(fsMap, fullPath, virtualPrefix, baseDir);
    } else if (entry.isFile() && /\.d\.([^.]+\.)?[cm]?ts$/i.test(entry.name)) {
      const relativePath = fullPath.slice(baseDir.length).replace(/\\/g, '/');
      const virtualPath = `${virtualPrefix}${relativePath}`;

      fsMap.set(virtualPath, readFileSync(fullPath, 'utf8'));
    }
  }
}

/**
 * Generates a virtual filesystem map containing all TypeScript library