Function scanDirectory

src/extraction/index.ts:1187–1211

(
  rootDir: string,
  onProgress?: (current: number, file: string) => void
)

 * projects, falls back to a filesystem walk that parses .gitignore itself.
 */
export function scanDirectory(
  rootDir: string,
  onProgress?: (current: number, file: string) => void
): string[] {
  // Custom extension → language overrides from the project's codegraph.json.
  const overrides = loadExtensionOverrides(rootDir);

  // Fast path: use git to get all visible files (respects .gitignore everywhere)
  const gitFiles = getGitVisibleFiles(rootDir);
  if (gitFiles) {
    const files: string[] = [];
    let count = 0;
    for (const filePath of gitFiles) {
      if (isSourceFile(filePath, overrides)) {
        files.push(filePath);
        count++;
        onProgress?.(count, filePath);
      }
    }
    return files;
  }

  // Fallback: walk filesystem for non-git projects
  return scanDirectoryWalk(rootDir, onProgress);
}

/**
 * Async variant of scanDirectory that yields to the event loop periodically,