Use static typing in all demos (#1063)

This leads to code that is easier to understand and runs
faster thanks to GDScript's typed instructions.

The untyped declaration warning is now enabled on all projects
where type hints were added. All projects currently run without
any untyped declration warnings.

Dodge the Creeps and Squash the Creeps demos intentionally don't
use type hints to match the documentation, where type hints haven't
been adopted yet (given its beginner focus).

3d/kinematic_character/level.tscn

@@ -104,7 +104,7 @@ data = {
 environment = SubResource("Environment_qep2e")
 
 [node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
-transform = Transform3D(-0.766045, 0.45452, -0.45452, 0, 0.707107, 0.707107, 0.642788, 0.541676, -0.541675, 0, 5, 0)
+transform = Transform3D(-0.436154, 0.776648, -0.454519, 0.353553, 0.612372, 0.707107, 0.827508, 0.147711, -0.541675, 0, 5, 0)
 light_energy = 1.3
 shadow_enabled = true
 shadow_bias = 0.032

3d/kinematic_character/player/cubio.gd

@@ -5,11 +5,11 @@ const JUMP_SPEED = 6.5
 const ACCELERATION = 4
 const DECELERATION = 4
 
-@onready var camera = $Target/Camera3D
-@onready var gravity = -ProjectSettings.get_setting("physics/3d/default_gravity")
-@onready var start_position = position
+@onready var camera: Camera3D = $Target/Camera3D
+@onready var gravity := float(-ProjectSettings.get_setting("physics/3d/default_gravity"))
+@onready var start_position := position
 
-func _physics_process(delta):
+func _physics_process(delta: float) -> void:
 	if Input.is_action_just_pressed(&"exit"):
 		get_tree().quit()
 	if Input.is_action_just_pressed(&"reset_position") or global_position.y < - 6:
@@ -17,17 +17,18 @@ func _physics_process(delta):
 		position = start_position
 		velocity = Vector3.ZERO
 
-	var dir = Vector3()
+	var dir := Vector3()
 	dir.x = Input.get_axis(&"move_left", &"move_right")
 	dir.z = Input.get_axis(&"move_forward", &"move_back")
 
 	# Get the camera's transform basis, but remove the X rotation such
 	# that the Y axis is up and Z is horizontal.
-	var cam_basis = camera.global_transform.basis
+	var cam_basis := camera.global_transform.basis
 	cam_basis = cam_basis.rotated(cam_basis.x, -cam_basis.get_euler().x)
 	dir = cam_basis * dir
 
-	# Limit the input to a length of 1. length_squared is faster to check.
+	# Limit the input to a length of 1. `length_squared()` is faster to check
+	# than `length()`.
 	if dir.length_squared() > 1:
 		dir /= dir.length()
 
@@ -35,11 +36,11 @@ func _physics_process(delta):
 	velocity.y += delta * gravity
 
 	# Using only the horizontal velocity, interpolate towards the input.
-	var hvel = velocity
+	var hvel := velocity
 	hvel.y = 0
 
-	var target = dir * MAX_SPEED
-	var acceleration
+	var target := dir * MAX_SPEED
+	var acceleration := 0.0
 	if dir.dot(hvel) > 0:
 		acceleration = ACCELERATION
 	else:
@@ -60,6 +61,6 @@ func _physics_process(delta):
 		velocity.y = JUMP_SPEED
 
 
-func _on_tcube_body_entered(body):
+func _on_tcube_body_entered(body: PhysicsBody3D) -> void:
 	if body == self:
-		get_node(^"WinText").show()
+		$WinText.show()

3d/kinematic_character/player/follow_camera.gd

@@ -1,37 +1,36 @@
-
 extends Camera3D
 
-# Member variables
-var collision_exception = []
-@export var min_distance = 0.5
-@export var max_distance = 3.0
-@export var angle_v_adjust = 0.0
-var max_height = 2.0
-var min_height = 0
+@export var min_distance := 0.5
+@export var max_distance := 3.0
+@export var angle_v_adjust := 0.0
+
+var collision_exception := []
+var max_height := 2.0
+var min_height := 0
+
 @onready var target_node: Node3D = get_parent()
 
-
-func _ready():
+func _ready() -> void:
 	collision_exception.append(target_node.get_parent().get_rid())
-	# Detaches the camera transform from the parent spatial node
-	set_as_top_level(true)
+	# Detaches the camera transform from the parent spatial node.
+	top_level = true
 
 
-func _physics_process(_delta):
-	var target_pos: Vector3 = target_node.global_transform.origin
-	var camera_pos: Vector3 = global_transform.origin
+func _physics_process(_delta: float) -> void:
+	var target_pos := target_node.global_transform.origin
+	var camera_pos := global_transform.origin
 
-	var delta_pos: Vector3 = camera_pos - target_pos
+	var delta_pos := camera_pos - target_pos
 
-	# Regular delta follow
+	# Regular delta follow.
 
-	# Check ranges
+	# Check ranges.
 	if delta_pos.length() < min_distance:
 		delta_pos = delta_pos.normalized() * min_distance
 	elif delta_pos.length() > max_distance:
 		delta_pos = delta_pos.normalized() * max_distance
 
-	# Check upper and lower height
+	# Check upper and lower height.
 	if delta_pos.y > max_height:
 		delta_pos.y = max_height
 	if delta_pos.y < min_height:
@@ -41,7 +40,7 @@ func _physics_process(_delta):
 
 	look_at_from_position(camera_pos, target_pos, Vector3.UP)
 
-	# Turn a little up or down
-	var t = transform
+	# Turn a little up or down.
+	var t := transform
 	t.basis = Basis(t.basis[0], deg_to_rad(angle_v_adjust)) * t.basis
 	transform = t

3d/kinematic_character/project.godot

@@ -18,6 +18,10 @@ run/main_scene="res://level.tscn"
 config/features=PackedStringArray("4.2")
 config/icon="res://icon.webp"
 
+[debug]
+
+gdscript/warnings/untyped_declaration=1
+
 [display]
 
 window/stretch/mode="canvas_items"