move a bunch of imports into TYPE_CHECKING blocks

These are only used for type checking, so don't bother importing them at
runtime.

Generally add future annotations at the same time, to make sure that
existing uses of these imports don't need to be quoted.

1 files changed, 5 insertions, 3 deletions

diff --git a/mesonbuild/interpreter/dependencyfallbacks.py b/mesonbuild/interpreter/dependencyfallbacks.py
index e029854..a252046 100644
--- a/mesonbuild/interpreter/dependencyfallbacks.py
+++ b/mesonbuild/interpreter/dependencyfallbacks.py
@@ -1,5 +1,6 @@
-from .interpreterobjects import SubprojectHolder, extract_required_kwarg
+from __future__ import annotations
 
+from .interpreterobjects import extract_required_kwarg
 from .. import mlog
 from .. import dependencies
 from .. import build
@@ -7,12 +8,13 @@ from ..wrap import WrapMode
 from ..mesonlib import OptionKey, extract_as_list, stringlistify, version_compare_many, listify
 from ..dependencies import Dependency, DependencyException, NotFoundDependency
 from ..interpreterbase import (MesonInterpreterObject, FeatureNew,
-                               InterpreterException, InvalidArguments,
-                               TYPE_nkwargs, TYPE_nvar)
+                               InterpreterException, InvalidArguments)
 
 import typing as T
 if T.TYPE_CHECKING:
     from .interpreter import Interpreter
+    from ..interpreterbase import TYPE_nkwargs, TYPE_nvar
+    from .interpreterobjects import SubprojectHolder
 
 
 class DependencyFallbacksHolder(MesonInterpreterObject):