Function removeFileDependency

packages/babel-cli/src/babel/watcher.ts:121–134

(filename: string, dep: string)

}

function removeFileDependency(filename: string, dep: string) {
  const deps = depToFiles.get(dep)!;
  deps.delete(filename);

  if (deps.size === 0) {
    depToFiles.delete(dep);

    if (!hasStarted) {
      watchQueue.delete(dep);
    } else {
      watcher.unwatch(dep);
    }
  }
}

function unwatchFile(filename: string) {
  const deps = fileToDeps.get(filename);