diff --git a/crosstl/backend/Vulkan/VulkanAst.py b/crosstl/backend/Vulkan/VulkanAst.py
index 67e9948..ef250b0 100644
--- a/crosstl/backend/Vulkan/VulkanAst.py
+++ b/crosstl/backend/Vulkan/VulkanAst.py
@@ -1,106 +1,129 @@
+from typing import Any
+
+
 class ASTNode:
-    pass
+    def __repr__(self) -> str:
+        return f"{self.__class__.__name__}()"
 
+    def __str__(self) -> str:
+        return self.__repr__()
 
-class TernaryOpNode:
-    def __init__(self, condition, true_expr, false_expr):
+
+class TernaryOpNode(ASTNode):
+    def __init__(self, condition: ASTNode, true_expr: ASTNode, false_expr: ASTNode):
         self.condition = condition
         self.true_expr = true_expr
         self.false_expr = false_expr
 
-    def __repr__(self):
-        return f"TernaryOpNode(condition={self.condition}, true_expr={self.true_expr}, false_expr={self.false_expr})"
+    def __repr__(self) -> str:
+        return (
+            f"TernaryOpNode(condition={self.condition}, "
+            f"true_expr={self.true_expr}, false_expr={self.false_expr})"
+        )
 
 
-class ShaderNode:
+class ShaderNode(ASTNode):
     def __init__(
         self,
-        spirv_version,
-        descriptor_sets,
-        shader_stages,
-        functions,
+        spirv_version: str,
+        descriptor_sets: list,
+        shader_stages: list,
+        functions: list,
     ):
         self.spirv_version = spirv_version
         self.descriptor_sets = descriptor_sets
         self.shader_stages = shader_stages
         self.functions = functions
 
-    def __repr__(self):
-        return f"ShaderNode(spirv_version={self.spirv_version}, descriptor_sets={self.descriptor_sets}, shader_stages={self.shader_stages}, functions={self.functions})"
+    def __repr__(self) -> str:
+        return (
+            f"ShaderNode(spirv_version={self.spirv_version}, "
+            f"descriptor_sets={self.descriptor_sets}, "
+            f"shader_stages={self.shader_stages}, functions={self.functions})"
+        )
 
 
 class IfNode(ASTNode):
     def __init__(
         self,
-        if_condition,
-        if_body,
-        else_if_conditions=[],
-        else_if_bodies=[],
-        else_body=None,
+        if_condition: ASTNode,
+        if_body: list,
+        else_if_conditions: list = None,
+        else_if_bodies: list = None,
+        else_body: list = None,
     ):
         self.if_condition = if_condition
         self.if_body = if_body
-        self.else_if_conditions = else_if_conditions
-        self.else_if_bodies = else_if_bodies
+        self.else_if_conditions = (
+            else_if_conditions if else_if_conditions is not None else []
+        )
+        self.else_if_bodies = else_if_bodies if else_if_bodies is not None else []
         self.else_body = else_body
 
-    def __repr__(self):
-        return f"IfNode(if_condition={self.if_condition}, if_body={self.if_body}, else_if_conditions={self.else_if_conditions}, else_if_bodies={self.else_if_bodies}, else_body={self.else_body})"
+    def __repr__(self) -> str:
+        return (
+            f"IfNode(if_condition={self.if_condition}, if_body={self.if_body}, "
+            f"else_if_conditions={self.else_if_conditions}, "
+            f"else_if_bodies={self.else_if_bodies}, else_body={self.else_body})"
+        )
 
 
 class ForNode(ASTNode):
-    def __init__(self, init, condition, update, body):
+    def __init__(self, init: ASTNode, condition: ASTNode, update: ASTNode, body: list):
         self.init = init
         self.condition = condition
         self.update = update
         self.body = body
 
-    def __repr__(self):
-        return f"ForNode(init={self.init}, condition={self.condition}, update={self.update}, body={self.body})"
+    def __repr__(self) -> str:
+        return (
+            f"ForNode(init={self.init}, condition={self.condition}, "
+            f"update={self.update}, body={self.body})"
+        )
 
 
 class ReturnNode(ASTNode):
-    def __init__(self, value):
+    def __init__(self, value: Any):
         self.value = value
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"ReturnNode(value={self.value})"
 
 
 class FunctionCallNode(ASTNode):
-    def __init__(self, name, args):
+    def __init__(self, name: str, args: list):
         self.name = name
         self.args = args
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"FunctionCallNode(name={self.name}, args={self.args})"
 
 
 class BinaryOpNode(ASTNode):
-    def __init__(self, left, op, right):
+    def __init__(self, left: ASTNode, op: str, right: ASTNode):
         self.left = left
         self.op = op
         self.right = right
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"BinaryOpNode(left={self.left}, op={self.op}, right={self.right})"
 
 
 class UnaryOpNode(ASTNode):
-    def __init__(self, op, operand):
+    def __init__(self, op: str, operand: ASTNode):
         self.op = op
         self.operand = operand
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"UnaryOpNode(operator={self.op}, operand={self.operand})"
 
 
 class DescriptorSetNode(ASTNode):
-    def __init__(self, set_number, bindings):
+    def __init__(self, set_number: int, bindings: list):
         self.set_number = set_number
         self.bindings = bindings
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return (
             f"DescriptorSetNode(set_number={self.set_number}, bindings={self.bindings})"
         )
@@ -109,12 +132,12 @@ def __repr__(self):
 class LayoutNode(ASTNode):
     def __init__(
         self,
-        bindings,
-        push_constant,
-        layout_type,
-        data_type,
-        variable_name,
-        struct_fields,
+        bindings: list,
+        push_constant: bool,
+        layout_type: str,
+        data_type: str,
+        variable_name: str,
+        struct_fields: list,
     ):
         self.bindings = bindings
         self.push_constant = push_constant
@@ -123,7 +146,7 @@ def __init__(
         self.variable_name = variable_name
         self.struct_fields = struct_fields
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return (
             f"LayoutNode(bindings={self.bindings}, push_constant={self.push_constant}, "
             f"layout_type={self.layout_type}, data_type={self.data_type}, "
@@ -132,121 +155,124 @@ def __repr__(self):
 
 
 class UniformNode(ASTNode):
-    def __init__(self, name, var_type, value=None):
+    def __init__(self, name: str, var_type: str, value: Any = None):
         self.name = name
         self.var_type = var_type
         self.value = value
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"UniformNode(name={self.name}, var_type={self.var_type}, value={self.value})"
 
 
 class ShaderStageNode(ASTNode):
-    def __init__(self, stage, entry_point):
+    def __init__(self, stage: str, entry_point: str):
         self.stage = stage
         self.entry_point = entry_point
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"ShaderStageNode(stage={self.stage}, entry_point={self.entry_point})"
 
 
 class PushConstantNode(ASTNode):
-    def __init__(self, size, values):
+    def __init__(self, size: int, values: list):
         self.size = size
         self.values = values
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"PushConstantNode(size={self.size}, values={self.values})"
 
 
 class StructNode(ASTNode):
-    def __init__(self, name, members):
+    def __init__(self, name: str, members: list):
         self.name = name
         self.members = members
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"StructNode(name={self.name}, members={self.members})"
 
 
 class FunctionNode(ASTNode):
-    def __init__(self, name, return_type, parameters, body):
+    def __init__(self, name: str, return_type: str, parameters: list, body: list):
         self.name = name
         self.return_type = return_type
         self.parameters = parameters
         self.body = body
 
-    def __repr__(self):
-        return f"FunctionNode(name={self.name}, return_type={self.return_type}, parameters={self.parameters}, body={self.body})"
+    def __repr__(self) -> str:
+        return (
+            f"FunctionNode(name={self.name}, return_type={self.return_type}, "
+            f"parameters={self.parameters}, body={self.body})"
+        )
 
 
 class MemberAccessNode(ASTNode):
-    def __init__(self, object, member):
+    def __init__(self, object: ASTNode, member: str):
         self.object = object
         self.member = member
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"MemberAccessNode(object={self.object}, member={self.member})"
 
 
 class VariableNode(ASTNode):
-    def __init__(self, name, var_type):
+    def __init__(self, name: str, var_type: str):
         self.name = name
         self.var_type = var_type
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"VariableNode(name={self.name}, var_type={self.var_type})"
 
 
 class SwitchNode(ASTNode):
-    def __init__(self, expression, cases):
+    def __init__(self, expression: ASTNode, cases: list):
         self.expression = expression
         self.cases = cases
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"SwitchNode(expression={self.expression}, cases={self.cases})"
 
 
 class CaseNode(ASTNode):
-    def __init__(self, value, body):
+    def __init__(self, value: Any, body: list):
         self.value = value
         self.body = body
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"CaseNode(value={self.value}, body={self.body})"
 
 
 class DefaultNode(ASTNode):
-    def __init__(self, statements):
+    def __init__(self, statements: list):
         self.statements = statements
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"DefaultNode(statements={self.statements})"
 
 
 class WhileNode(ASTNode):
-    def __init__(self, condition, body):
+    def __init__(self, condition: ASTNode, body: list):
         self.condition = condition
         self.body = body
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"WhileNode(condition={self.condition}, body={self.body})"
 
 
 class DoWhileNode(ASTNode):
-    def __init__(self, body, condition):
+    def __init__(self, body: list, condition: ASTNode):
         self.body = body
         self.condition = condition
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"DoWhileNode(body={self.body}, condition={self.condition})"
 
 
 class AssignmentNode(ASTNode):
-    def __init__(self, name, value):
+    def __init__(self, name: str, value: Any):
         self.name = name
         self.value = value
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"AssignmentNode(name={self.name}, value={self.value})"
 
 
@@ -254,5 +280,5 @@ class BreakNode(ASTNode):
     def __init__(self):
         pass
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return f"BreakNode()"