Need help with "Parse Error: Cannot infer the type of "direction" variable because the value doesn't have a set type"

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`Parse Error: Cannot infer the type of “direction” variable because the value doesn’t have a set type

here is my code

extends CharacterBody3D


const SPEED = 5.0
const JUMP_VELOCITY = 4.5
const SENSITIVITY = 0.02

@onready var head = $Head
@onready var camera =$Head/Camera3D

func _ready():
	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

func _unhandled_input(event: InputEvent):
	if event is InputEventMouseMotion:
		head.rotate_y(-event.relative.x * SENSITIVITY)
		camera.rotate_x(-event.relative.y * SENSITIVITY)
		camera.rotation.x = clamp(camera.rotation.x, deg_to_rad(-40), deg_to_rad(60))


func _physics_process(delta: float) -> void:
	# Add the gravity.
	if not is_on_floor():
		velocity += get_gravity() * delta

	# Handle jump.
	if Input.is_action_just_pressed("ui_accept") and is_on_floor():
		velocity.y = JUMP_VELOCITY

	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.
	var input_dir := Input.get_vector("left", "right", "up", "down")
	var direction := (head.transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
	if direction:
		velocity.x = direction.x * SPEED
		velocity.z = direction.z * SPEED
	else:
		velocity.x = 0.0
		velocity.z = 0.0

	move_and_slide()
2

Try change this:

var direction := (head.transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()

To:

var direction: Vector3 = (head.transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()

:= only works if Godot is able to detect the return type of the function or the value of the variable, but in this case Godot seems to not be able to guess which type this will result.

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