dev-cmd/typecheck: Use Sorbet's --dir to set the tap path

- This means we don't have to copy config files around,
  and users get instant results rather than having
  to run `srb init`.

Library/Homebrew/dev-cmd/typecheck.rb

@@ -44,15 +44,16 @@ class Typecheck < AbstractCommand
 
  sig { override.void }
  def run
+ raise UsageError, "Cannot use --dir when specifying a tap." if args.named.present? && args.dir.present?
+
  update = args.update? || args.update_all?
- directory = args.no_named? ? HOMEBREW_LIBRARY_PATH : args.named.to_paths(only: :tap).first
  groups = update ? Homebrew.valid_gem_groups : ["typecheck"]
  Homebrew.install_bundler_gems!(groups:)
 
  # Sorbet doesn't use bash privileged mode so we align EUID and UID here.
  Process::UID.change_privilege(Process.euid) if Process.euid != Process.uid
 
- directory.cd do
+ HOMEBREW_LIBRARY_PATH.cd do
  if update
  workers = args.debug? ? ["--workers=1"] : []
  safe_system "bundle", "exec", "tapioca", "dsl", *workers
@@ -96,10 +97,11 @@ def run
  end
 
  srb_exec += ["--ignore", args.ignore] if args.ignore.present?
- if args.file.present? || args.dir.present?
+ if args.file.present? || args.dir.present? || (tap_dir = args.named.to_paths(only: :tap).first).present?
  cd("sorbet") do
  srb_exec += ["--file", "../#{args.file}"] if args.file
  srb_exec += ["--dir", "../#{args.dir}"] if args.dir
+ srb_exec += ["--dir", tap_dir.to_s] if tap_dir
  end
  end
  success = system(*srb_exec)