can someone help me with Invalid call Nonexistent function is_action_just_presed in base inputDefaul

You have to add those actions in the project settings. Or you could create them in code.

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I think it could also be the if statement in the return that could be causing the issue. I don't remember right off how ternary if statements work in Godot, but I remember they are kinda strange. If adding the actions in the project settings or through code do not fix the issue, I would see something like the code below works instead.

func get_direction() -> Vector2:
	var y_pos = 1.0
	if Input.is_action_just_pressed("jump") and is_on_floor():
		y_pos = -1.0
	
	return Vector2(
		Input.get_action_strength("move_right") - Input.get_action_strength("move_left"),
		y_pos
	)