old_contents: """This module provides persistent global storage for other modules."""
  
  from collections import defaultdict
  import threading
  
  from .util import printf
  from .settings import Settings
  
  
  api_ready = False
  kill_switch = True
  
  settings = Settings()
  
  # A mapping between buffer ids and errors,
  # Dict[buffer_id, [error]]
  errors = defaultdict(list)
  
  # A mapping between linter class names and linter classes
  linter_classes = {}
  
  # A mapping between buffer ids and a list of linter instances
  view_linters = {}
  
  # Dict[buffer_id, [Popen]]
  active_procs = defaultdict(list)
  active_procs_lock = threading.Lock()
  
  
  def debug_mode():
      """Return whether the "debug" setting is True."""
      return settings.get('debug', False)
  
  
  def debug(*args):
      """Print args to the console if the "debug" setting is True."""
      if debug_mode():
          printf(*args)
  
new_contents: """This module provides persistent global storage for other modules."""
  
  from collections import defaultdict
  import threading
  
  from .util import printf
  from .settings import Settings
  
  
  if False:
      from typing import DefaultDict, Dict, List, Type, Optional
      from mypy_extensions import TypedDict
      import sublime
      import subprocess
      from .linter import Linter
  
      LintError = TypedDict('LintError', {
          'line': int,
          'start': int,
          'end': int,
          'region': sublime.Region,
          'linter': str,
          'error_type': str,
          'code': Optional[str],
          'msg': str,
          'panel_line': int
      })
  
  
  api_ready = False
  kill_switch = True
  
  settings = Settings()
  
  # A mapping between buffer ids and errors,
  # Dict[buffer_id, [error]]
  errors = defaultdict(list)  # type: DefaultDict[sublime.BufferId, List[LintError]]
  
  # A mapping between linter class names and linter classes
  linter_classes = {}  # type: Dict[str, Type[Linter]]
  
  # A mapping between buffer ids and a list of linter instances
  view_linters = {}  # type: Dict[sublime.BufferId, List[Linter]]
  
  # Dict[buffer_id, [Popen]]
  active_procs = defaultdict(list)  # type: DefaultDict[sublime.BufferId, List[subprocess.Popen]]
  active_procs_lock = threading.Lock()
  
  
  def debug_mode():
      # type: () -> bool
      """Return whether the "debug" setting is True."""
      return settings.get('debug', False)
  
  
  def debug(*args):
      # type: (...) -> None
      """Print args to the console if the "debug" setting is True."""
      if debug_mode():
          printf(*args)
  
subject: Add typing to 'persist.py'