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Parse Error: Function "update()" not found in base self.

CanvasItem.update() was renamed to queue_redraw().

Cause

A call written as update() inside your script is resolved on self. Godot 4 does not have that method. Drawing still happens from _draw(); queue_redraw() asks the canvas item to call it again.

Fix

extends Node2D

func _draw() -> void:
	draw_line(Vector2.ZERO, Vector2(32, 0), Color.WHITE, 2.0)

func mark_dirty() -> void:
	queue_redraw()

Related

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Godot Dev Tools is a Pulse Works Studio project. All error explainers.