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/rigidbody_character/level.gd

@@ -1,8 +1,8 @@
 extends Node3D
 
 # Random spawn of Rigidbody cubes.
-func _on_SpawnTimer_timeout():
-	var new_rb = preload("res://cube_rigidbody.tscn").instantiate()
+func _on_SpawnTimer_timeout() -> void:
+	var new_rb: RigidBody3D = preload("res://cube_rigidbody.tscn").instantiate()
 	new_rb.position.y = 15
 	new_rb.position.x = randf_range(-5, 5)
 	new_rb.position.z = randf_range(-5, 5)

3d/rigidbody_character/level.tscn

@@ -107,7 +107,7 @@ data = {
 environment = SubResource("Environment_jpjfl")
 
 [node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
-transform = Transform3D(-0.766044, 0.45452, -0.454519, 0, 0.707107, 0.707107, 0.642788, 0.541675, -0.541675, 0, 5, 1)
+transform = Transform3D(-0.436154, 0.776648, -0.45452, 0.353553, 0.612372, 0.707107, 0.827508, 0.14771, -0.541675, 0, 5, 1)
 light_energy = 1.3
 shadow_enabled = true
 shadow_bias = 0.032

3d/rigidbody_character/player/cubio.gd

@@ -1,10 +1,10 @@
 extends RigidBody3D
 
-@onready var shape_cast = $ShapeCast3D
-@onready var camera = $Target/Camera3D
-@onready var start_position = position
+@onready var shape_cast: ShapeCast3D = $ShapeCast3D
+@onready var camera: Camera3D = $Target/Camera3D
+@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:
@@ -12,13 +12,13 @@ func _physics_process(_delta):
 		position = start_position
 		linear_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
 
@@ -38,11 +38,10 @@ func _physics_process(_delta):
 
 
 # Test if there is a body below the player.
-func on_ground():
-	if shape_cast.is_colliding():
-		return true
+func on_ground() -> bool:
+	return shape_cast.is_colliding()
 
 
-func _on_tcube_body_entered(body):
+func _on_tcube_body_entered(body: Node) -> void:
 	if body == self:
-		get_node(^"WinText").show()
+		$WinText.visible = true

3d/rigidbody_character/player/follow_camera.gd

@@ -1,41 +1,41 @@
 extends Camera3D
 
-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
+var collision_exception := []
+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
 @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)
+	# Detach 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.
 	delta_pos.y = clamp(delta_pos.y, min_height, max_height)
 	camera_pos = target_pos + delta_pos
 
 	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/rigidbody_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"