godot create signal connections through script code example

Example 1: hwo to fire custom signal in godot

signal is_a_signal
if isasignal:
	emit_signal(is_a_signal)

Example 2: godot connect signal code

extends Node2D


func _ready():
    $Timer.connect("timeout", self, "_on_Timer_timeout")


func _on_Timer_timeout():
    $Sprite.visible = !$Sprite.visible