create abstract state class

scenes/classes/state.gd

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+## Virtual base class for all states.
+## Extend this class and override its methods to implement a state.
+@abstract class_name State extends Node
+
+## Emitted when the state finishes and wants to transition to another state.
+@warning_ignore("unused_signal")
+signal finished(next_state_path: String, data: Dictionary)
+
+## Called by the state machine when receiving unhandled input events.
+@abstract func _handle_input(_event: InputEvent) -> void
+
+## Called by the state machine on the engine's main loop tick.
+@abstract func _state_update(_delta: float) -> void
+
+## Called by the state machine on the engine's physics update tick.
+@abstract func _state_physics_update(_delta: float) -> void
+
+## Called by the state machine upon changing the active state. The `data` parameter
+## is a dictionary with arbitrary data the state can use to initialize itself.
+@abstract func _enter(previous_state_path: String, data: Dictionary) -> void
+
+## Called by the state machine before changing the active state. Use this function
+## to clean up the state.
+@abstract func _exit() -> void

scenes/classes/state.gd.uid

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+uid://bpjerj832q2gf

scenes/classes/state.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://kyeowhvglgj2"]
+
+[ext_resource type="Script" uid="uid://bpjerj832q2gf" path="res://scenes/classes/state.gd" id="1_m4c3p"]
+
+[node name="State" type="Node"]
+script = ExtResource("1_m4c3p")