Function getChangedCatalogEntries

packages/bumpy/src/commands/check.ts:413–443

* Compute which catalog entries changed between the base ref and HEAD. * Returns Map >. Empty if no catalog files changed.

(
  rootDir: string,
  baseBranch: string,
  changedFiles: string[],
)

 * Returns Map<catalogName, Set<depName>>. Empty if no catalog files changed.
 */
async function getChangedCatalogEntries(
  rootDir: string,
  baseBranch: string,
  changedFiles: string[],
): Promise<Map<string, Set<string>>> {
  const catalogFileChanged = changedFiles.some((f) => (CATALOG_FILES as readonly string[]).includes(f));
  if (!catalogFileChanged) return new Map();

  const baseRef = getBaseCompareRef(rootDir, baseBranch);

  const pm = await detectPackageManager(rootDir);

  // The workspace YAML that may hold catalogs: pnpm-workspace.yaml for pnpm,
  // .yarnrc.yml for Yarn, and none for npm/bun (which use package.json).
  const yamlFile = catalogYamlFile(pm);

  // Load "after" (current working tree state)
  const afterYaml =
    yamlFile && (await exists(resolve(rootDir, yamlFile))) ? await readText(resolve(rootDir, yamlFile)) : null;
  const afterPkgJson = (await exists(resolve(rootDir, 'package.json')))
    ? await readText(resolve(rootDir, 'package.json'))
    : null;
  const afterCatalogs = parseCatalogs(afterYaml, afterPkgJson);

  // Load "before" (state at base ref).
  const beforeYaml = yamlFile ? readFileAtRef(rootDir, baseRef, yamlFile) : null;
  const beforePkgJson = readFileAtRef(rootDir, baseRef, 'package.json');
  const beforeCatalogs = parseCatalogs(beforeYaml, beforePkgJson);

  return diffCatalogMaps(beforeCatalogs, afterCatalogs);
}