diff --git a/tests/test_generate_popular_node_signatures.py b/tests/test_generate_popular_node_signatures.py
index b531ccd..23b9fd7 100644
--- a/tests/test_generate_popular_node_signatures.py
+++ b/tests/test_generate_popular_node_signatures.py
@@ -1224,6 +1224,42 @@ NODE_CLASS_MAPPINGS = {
         self.assertEqual({}, result["nodes"])
         self.assertEqual("no_static_nodes", result["pack"]["status"])
 
+    def test_node_mapping_uses_assignment_time_class_binding(self):
+        source = '''
+class Node:
+    RETURN_TYPES = ("IMAGE",)
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "image": ("IMAGE",),
+            },
+        }
+
+
+NODE_CLASS_MAPPINGS = {
+    "Node": Node,
+}
+
+
+class Node:
+    RETURN_TYPES = ("MASK",)
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "mask": ("MASK",),
+            },
+        }
+'''
+        result = self._extract_source(source, "assignment-time-class-binding-pack")
+
+        self.assertEqual(["IMAGE"], result["nodes"]["Node"]["outputs"])
+        self.assertEqual({"image": "IMAGE"}, result["nodes"]["Node"]["inputs"])
+        self.assertEqual("ok", result["pack"]["status"])
+
     def test_conditional_class_mapping_skips_node(self):
         source = '''
 if True:
@@ -1271,6 +1307,35 @@ NODE_CLASS_MAPPINGS = {
         self.assertIn("TopLevelMappedNode", result["nodes"])
         self.assertEqual("ok", result["pack"]["status"])
 
+    def test_node_mapping_key_uses_assignment_time_env(self):
+        source = '''
+KEY = "Original"
+
+
+class Node:
+    RETURN_TYPES = ("IMAGE",)
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "image": ("IMAGE",),
+            },
+        }
+
+
+NODE_CLASS_MAPPINGS = {
+    KEY: Node,
+}
+KEY = "Wrong"
+'''
+        result = self._extract_source(source, "assignment-time-key-pack")
+
+        self.assertIn("Original", result["nodes"])
+        self.assertNotIn("Wrong", result["nodes"])
+        self.assertEqual(["IMAGE"], result["nodes"]["Original"]["outputs"])
+        self.assertEqual("ok", result["pack"]["status"])
+
     def test_mutated_node_class_mapping_skips_node(self):
         source = '''
 class MutatedMappingNode:
diff --git a/tools/generate_popular_node_signatures.py b/tools/generate_popular_node_signatures.py
index 9a657ae..77cd19d 100644
--- a/tools/generate_popular_node_signatures.py
+++ b/tools/generate_popular_node_signatures.py
@@ -307,104 +307,104 @@ def _invalidate_class_bindings(class_bindings, names):
         class_bindings.pop(name, None)
 
 
-def _collect_module_env(tree, class_bindings=None):
-    env = {}
-    for stmt in tree.body:
-        names = _mutating_call_target_names(stmt)
+def _apply_module_stmt_to_env(stmt, env, class_bindings=None):
+    names = _mutating_call_target_names(stmt)
+    _invalidate_class_bindings(class_bindings, names)
+    for name in names:
+        env.pop(name, None)
+    if isinstance(stmt, ast.ClassDef):
+        if class_bindings is not None:
+            class_bindings[stmt.name] = (stmt, dict(env))
+        env.pop(stmt.name, None)
+        return
+    if isinstance(stmt, ast.Assign):
+        names = _assignment_target_names(stmt)
+        _invalidate_class_bindings(class_bindings, names)
+        if len(stmt.targets) == 1 and isinstance(stmt.targets[0], ast.Name):
+            name = stmt.targets[0].id
+            if (
+                isinstance(stmt.value, ast.Name)
+                and stmt.value.id in env
+                and _is_mutable_static_value(env[stmt.value.id])
+            ):
+                env.pop(stmt.value.id, None)
+                env.pop(name, None)
+                return
+            try:
+                env[name] = _literal(stmt.value, env)
+            except UnsupportedStaticExpression:
+                env.pop(name, None)
+        else:
+            for name in names:
+                env.pop(name, None)
+        return
+    if isinstance(stmt, ast.AnnAssign):
+        names = _assignment_target_names(stmt)
+        _invalidate_class_bindings(class_bindings, names)
+        if stmt.value is None:
+            return
+        if isinstance(stmt.target, ast.Name):
+            name = stmt.target.id
+            if (
+                isinstance(stmt.value, ast.Name)
+                and stmt.value.id in env
+                and _is_mutable_static_value(env[stmt.value.id])
+            ):
+                env.pop(stmt.value.id, None)
+                env.pop(name, None)
+                return
+            try:
+                env[name] = _literal(stmt.value, env)
+            except UnsupportedStaticExpression:
+                env.pop(name, None)
+        else:
+            for name in names:
+                env.pop(name, None)
+        return
+    if isinstance(stmt, ast.AugAssign):
+        names = _assignment_target_names(stmt)
         _invalidate_class_bindings(class_bindings, names)
         for name in names:
             env.pop(name, None)
-        if isinstance(stmt, ast.ClassDef):
-            if class_bindings is not None:
-                class_bindings[stmt.name] = (stmt, dict(env))
-            env.pop(stmt.name, None)
-            continue
-        if isinstance(stmt, ast.Assign):
-            names = _assignment_target_names(stmt)
-            _invalidate_class_bindings(class_bindings, names)
-            if len(stmt.targets) == 1 and isinstance(stmt.targets[0], ast.Name):
-                name = stmt.targets[0].id
-                if (
-                    isinstance(stmt.value, ast.Name)
-                    and stmt.value.id in env
-                    and _is_mutable_static_value(env[stmt.value.id])
-                ):
-                    env.pop(stmt.value.id, None)
-                    env.pop(name, None)
-                    continue
-                try:
-                    env[name] = _literal(stmt.value, env)
-                except UnsupportedStaticExpression:
-                    env.pop(name, None)
-            else:
-                for name in names:
-                    env.pop(name, None)
-            continue
-        if isinstance(stmt, ast.AnnAssign):
-            names = _assignment_target_names(stmt)
-            _invalidate_class_bindings(class_bindings, names)
-            if stmt.value is None:
-                continue
-            if isinstance(stmt.target, ast.Name):
-                name = stmt.target.id
-                if (
-                    isinstance(stmt.value, ast.Name)
-                    and stmt.value.id in env
-                    and _is_mutable_static_value(env[stmt.value.id])
-                ):
-                    env.pop(stmt.value.id, None)
-                    env.pop(name, None)
-                    continue
-                try:
-                    env[name] = _literal(stmt.value, env)
-                except UnsupportedStaticExpression:
-                    env.pop(name, None)
-            else:
-                for name in names:
-                    env.pop(name, None)
-            continue
-        if isinstance(stmt, ast.AugAssign):
-            names = _assignment_target_names(stmt)
-            _invalidate_class_bindings(class_bindings, names)
-            for name in names:
-                env.pop(name, None)
-            continue
-        if isinstance(stmt, ast.Delete):
-            names = _delete_target_names(stmt)
-            _invalidate_class_bindings(class_bindings, names)
-            for name in names:
-                env.pop(name, None)
-            continue
-        if isinstance(stmt, ast.Expr):
-            names = _mutating_call_target_names(stmt)
-            _invalidate_class_bindings(class_bindings, names)
-            for name in names:
-                env.pop(name, None)
-            names = _bound_names(stmt)
-            _invalidate_class_bindings(class_bindings, names)
-            for name in names:
-                env.pop(name, None)
-            continue
-        if isinstance(stmt, (ast.If, ast.For, ast.AsyncFor, ast.While, ast.Try, ast.With, ast.AsyncWith, ast.Match)):
-            if _has_wildcard_import_in_control_flow(stmt):
-                env.clear()
-                if class_bindings is not None:
-                    class_bindings.clear()
-                continue
-            names = _assigned_names_in_control_flow(stmt)
-            _invalidate_class_bindings(class_bindings, names)
-            for name in names:
-                env.pop(name, None)
-            continue
-        if _has_wildcard_import(stmt):
-            env.clear()
-            if class_bindings is not None:
-                class_bindings.clear()
-            continue
+        return
+    if isinstance(stmt, ast.Delete):
+        names = _delete_target_names(stmt)
+        _invalidate_class_bindings(class_bindings, names)
+        for name in names:
+            env.pop(name, None)
+        return
+    if isinstance(stmt, ast.Expr):
         names = _bound_names(stmt)
         _invalidate_class_bindings(class_bindings, names)
         for name in names:
             env.pop(name, None)
+        return
+    if isinstance(stmt, (ast.If, ast.For, ast.AsyncFor, ast.While, ast.Try, ast.With, ast.AsyncWith, ast.Match)):
+        if _has_wildcard_import_in_control_flow(stmt):
+            env.clear()
+            if class_bindings is not None:
+                class_bindings.clear()
+            return
+        names = _assigned_names_in_control_flow(stmt)
+        _invalidate_class_bindings(class_bindings, names)
+        for name in names:
+            env.pop(name, None)
+        return
+    if _has_wildcard_import(stmt):
+        env.clear()
+        if class_bindings is not None:
+            class_bindings.clear()
+        return
+    names = _bound_names(stmt)
+    _invalidate_class_bindings(class_bindings, names)
+    for name in names:
+        env.pop(name, None)
+
+
+def _collect_module_env(tree, class_bindings=None):
+    env = {}
+    for stmt in tree.body:
+        _apply_module_stmt_to_env(stmt, env, class_bindings)
     return env
 
 
@@ -588,22 +588,24 @@ def _name_is_assigned(stmt, name):
     return name in _assignment_target_names(stmt)
 
 
-def _module_dict_entries(node, env, value_converter):
+def _module_dict_entries(node, env, class_bindings, value_converter):
     if not isinstance(node, ast.Dict):
         raise UnsupportedStaticExpression(type(node).__name__)
     result = {}
     for key, value in zip(node.keys, node.values):
         if key is None:
             raise UnsupportedStaticExpression("dict unpacking is not supported")
-        converted_value = value_converter(value)
+        converted_value = value_converter(value, env, class_bindings)
         if converted_value is None:
             continue
         result[_literal(key, env)] = converted_value
     return result
 
 
-def _final_module_dict(tree, env, name, value_converter):
+def _final_module_dict(tree, name, value_converter):
     value = _MISSING
+    env = {}
+    class_bindings = {}
     for stmt in tree.body:
         if name in _mutating_call_target_names(stmt):
             value = _INVALID
@@ -611,67 +613,88 @@ def _final_module_dict(tree, env, name, value_converter):
             if not _name_is_assigned(stmt, name):
                 if isinstance(stmt.value, ast.Name) and stmt.value.id == name:
                     value = _INVALID
+                _apply_module_stmt_to_env(stmt, env, class_bindings)
                 continue
             if len(stmt.targets) == 1 and isinstance(stmt.targets[0], ast.Name):
                 try:
-                    value = _module_dict_entries(stmt.value, env, value_converter)
+                    value = _module_dict_entries(stmt.value, env, class_bindings, value_converter)
                 except UnsupportedStaticExpression:
                     value = _INVALID
             else:
                 value = _INVALID
+            _apply_module_stmt_to_env(stmt, env, class_bindings)
             continue
         if isinstance(stmt, ast.AnnAssign):
             if not _name_is_assigned(stmt, name):
                 if isinstance(stmt.value, ast.Name) and stmt.value.id == name:
                     value = _INVALID
+                _apply_module_stmt_to_env(stmt, env, class_bindings)
                 continue
             if isinstance(stmt.target, ast.Name) and stmt.value is not None:
                 try:
-                    value = _module_dict_entries(stmt.value, env, value_converter)
+                    value = _module_dict_entries(stmt.value, env, class_bindings, value_converter)
                 except UnsupportedStaticExpression:
                     value = _INVALID
             else:
                 value = _INVALID
+            _apply_module_stmt_to_env(stmt, env, class_bindings)
             continue
         if isinstance(stmt, ast.AugAssign):
             if _name_is_assigned(stmt, name):
                 value = _INVALID
+            _apply_module_stmt_to_env(stmt, env, class_bindings)
             continue
         if isinstance(stmt, ast.Delete):
             if name in _delete_target_names(stmt):
                 value = _INVALID
+            _apply_module_stmt_to_env(stmt, env, class_bindings)
             continue
         if isinstance(stmt, ast.Expr):
             if name in _mutating_call_target_names(stmt):
                 value = _INVALID
             if name in _bound_names(stmt):
                 value = _INVALID
+            _apply_module_stmt_to_env(stmt, env, class_bindings)
             continue
         if isinstance(stmt, (ast.If, ast.For, ast.AsyncFor, ast.While, ast.Try, ast.With, ast.AsyncWith, ast.Match)):
             if name in _assigned_names_in_control_flow(stmt):
                 value = _INVALID
             if _has_wildcard_import_in_control_flow(stmt):
                 value = _INVALID
+            _apply_module_stmt_to_env(stmt, env, class_bindings)
             continue
         if _has_wildcard_import(stmt):
             value = _INVALID
+            _apply_module_stmt_to_env(stmt, env, class_bindings)
             continue
         if name in _bound_names(stmt):
             value = _INVALID
+        _apply_module_stmt_to_env(stmt, env, class_bindings)
     if value in (_MISSING, _INVALID):
         return {}
     return value
 
 
-def _node_class_mappings(tree, env):
+def _mapping_value_binding(value, env, class_bindings):
+    class_name = _mapping_value_name(value)
+    if class_name is None:
+        return None
+    return class_bindings.get(class_name)
+
+
+def _node_class_mappings(tree):
     if _has_module_wildcard_import(tree):
         return {}
-    mappings = _final_module_dict(tree, env, "NODE_CLASS_MAPPINGS", _mapping_value_name)
-    return {str(node_type): class_name for node_type, class_name in mappings.items() if node_type and class_name}
+    mappings = _final_module_dict(tree, "NODE_CLASS_MAPPINGS", _mapping_value_binding)
+    return {str(node_type): binding for node_type, binding in mappings.items() if node_type and binding is not None}
 
 
-def _display_mappings(tree, env):
-    displays = _final_module_dict(tree, env, "NODE_DISPLAY_NAME_MAPPINGS", lambda value: _literal(value, env))
+def _display_mappings(tree):
+    displays = _final_module_dict(
+        tree,
+        "NODE_DISPLAY_NAME_MAPPINGS",
+        lambda value, env, _class_bindings: _literal(value, env),
+    )
     return {str(k): str(v) for k, v in displays.items()}
 
 
@@ -740,14 +763,10 @@ def extract_repo_signatures(repo_dir, pack_meta):
         tree = _parse_python_file(path)
         if tree is None:
             continue
-        class_bindings = {}
-        env = _collect_module_env(tree, class_bindings)
-        mappings = _node_class_mappings(tree, env)
-        displays = _display_mappings(tree, env)
-        for node_type, class_name in sorted(mappings.items()):
-            binding = class_bindings.get(class_name)
-            if binding is None:
-                continue
+        env = _collect_module_env(tree)
+        mappings = _node_class_mappings(tree)
+        displays = _display_mappings(tree)
+        for node_type, binding in sorted(mappings.items()):
             cls, class_env = binding
             sig = _signature_from_class(node_type, cls, displays.get(node_type), pack_meta, class_env, env)
             if sig is not None: