diff --git a/lib/spack/spack/package.py b/lib/spack/spack/package.py
index e73bfb7090b..58abb891adc 100644
--- a/lib/spack/spack/package.py
+++ b/lib/spack/spack/package.py
@@ -2,7 +2,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-# flake8: noqa: F401, E402
 """spack.package defines the public API for Spack packages, by re-exporting useful symbols from
 other modules. Packages should import this module, instead of importing from spack.* directly
 to ensure forward compatibility with future versions of Spack."""
@@ -13,17 +12,6 @@
 # import most common types used in packages
 from typing import Dict, List, Optional
 
-
-class tty:
-    import llnl.util.tty as _tty
-
-    debug = _tty.debug
-    error = _tty.error
-    info = _tty.info
-    msg = _tty.msg
-    warn = _tty.warn
-
-
 from llnl.util.filesystem import (
     FileFilter,
     FileList,
@@ -61,51 +49,6 @@ class tty:
 from llnl.util.symlink import symlink
 
 from spack.build_environment import MakeExecutable
-from spack.build_systems.aspell_dict import AspellDictPackage
-from spack.build_systems.autotools import AutotoolsPackage
-from spack.build_systems.bundle import BundlePackage
-from spack.build_systems.cached_cmake import (
-    CachedCMakePackage,
-    cmake_cache_filepath,
-    cmake_cache_option,
-    cmake_cache_path,
-    cmake_cache_string,
-)
-from spack.build_systems.cargo import CargoPackage
-from spack.build_systems.cmake import CMakePackage, generator
-from spack.build_systems.compiler import CompilerPackage
-from spack.build_systems.cuda import CudaPackage
-from spack.build_systems.generic import Package
-from spack.build_systems.gnu import GNUMirrorPackage
-from spack.build_systems.go import GoPackage
-from spack.build_systems.intel import IntelPackage
-from spack.build_systems.lua import LuaPackage
-from spack.build_systems.makefile import MakefilePackage
-from spack.build_systems.maven import MavenPackage
-from spack.build_systems.meson import MesonPackage
-from spack.build_systems.msbuild import MSBuildPackage
-from spack.build_systems.nmake import NMakePackage
-from spack.build_systems.octave import OctavePackage
-from spack.build_systems.oneapi import (
-    INTEL_MATH_LIBRARIES,
-    IntelOneApiLibraryPackage,
-    IntelOneApiLibraryPackageWithSdk,
-    IntelOneApiPackage,
-    IntelOneApiStaticLibraryList,
-)
-from spack.build_systems.perl import PerlPackage
-from spack.build_systems.python import PythonExtension, PythonPackage
-from spack.build_systems.qmake import QMakePackage
-from spack.build_systems.r import RPackage
-from spack.build_systems.racket import RacketPackage
-from spack.build_systems.rocm import ROCmPackage
-from spack.build_systems.ruby import RubyPackage
-from spack.build_systems.scons import SConsPackage
-from spack.build_systems.sip import SIPPackage
-from spack.build_systems.sourceforge import SourceforgePackage
-from spack.build_systems.sourceware import SourcewarePackage
-from spack.build_systems.waf import WafPackage
-from spack.build_systems.xorg import XorgPackage
 from spack.builder import BaseBuilder
 from spack.config import determine_number_of_jobs
 from spack.deptypes import ALL_TYPES as all_deptypes
@@ -158,6 +101,123 @@ class tty:
 cd = chdir
 pwd = getcwd
 
+
+class tty:
+    import llnl.util.tty as _tty
+
+    debug = _tty.debug
+    error = _tty.error
+    info = _tty.info
+    msg = _tty.msg
+    warn = _tty.warn
+
+
+__all__ = [
+    "chdir",
+    "environ",
+    "getcwd",
+    "makedirs",
+    "mkdir",
+    "remove",
+    "removedirs",
+    "move",
+    "rmtree",
+    "Dict",
+    "List",
+    "Optional",
+    "FileFilter",
+    "FileList",
+    "HeaderList",
+    "LibraryList",
+    "ancestor",
+    "can_access",
+    "change_sed_delimiter",
+    "copy",
+    "copy_tree",
+    "filter_file",
+    "find",
+    "find_all_headers",
+    "find_first",
+    "find_headers",
+    "find_libraries",
+    "find_system_libraries",
+    "force_remove",
+    "force_symlink",
+    "install",
+    "install_tree",
+    "is_exe",
+    "join_path",
+    "keep_modification_time",
+    "library_extensions",
+    "mkdirp",
+    "remove_directory_contents",
+    "remove_linked_tree",
+    "rename",
+    "set_executable",
+    "set_install_permissions",
+    "touch",
+    "working_dir",
+    "symlink",
+    "MakeExecutable",
+    "BaseBuilder",
+    "determine_number_of_jobs",
+    "all_deptypes",
+    "build_system",
+    "can_splice",
+    "conditional",
+    "conflicts",
+    "depends_on",
+    "extends",
+    "license",
+    "maintainers",
+    "patch",
+    "provides",
+    "redistribute",
+    "requires",
+    "resource",
+    "variant",
+    "version",
+    "InstallError",
+    "NoHeadersError",
+    "NoLibrariesError",
+    "SkipTest",
+    "cache_extra_test_sources",
+    "check_outputs",
+    "find_required_file",
+    "get_escaped_text_output",
+    "install_test_root",
+    "test_part",
+    "filter_compiler_wrappers",
+    "default_args",
+    "when",
+    "build_system_flags",
+    "env_flags",
+    "inject_flags",
+    "on_package_attributes",
+    "bash_completion_path",
+    "fish_completion_path",
+    "zsh_completion_path",
+    "run_after",
+    "run_before",
+    "Spec",
+    "EnvironmentModifications",
+    "Executable",
+    "ProcessError",
+    "which",
+    "which_string",
+    "fix_darwin_install_name",
+    "Prefix",
+    "any_combination_of",
+    "auto_or_any_combination_of",
+    "disjoint_sets",
+    "Version",
+    "ver",
+    "env",
+    "cd",
+    "pwd",
+    "tty",
+]
+
 # These are just here for editor support; they may be set when the build env is set up.
 configure: Executable
 make_jobs: int