Angular @ouput a values when a signal change

What is the best way to @output the value of a variable with angular signal ?

Let say we have the following

$foo = signal<string>('')

@Output() fooChanged: EventEmitter<string> = new EventEmitter<string(this.$foo())

1. 
   effect: My first though would have been to use effect but as I read it, it should kind of being avoided if possible.
   
   
2. 
   computed: I would love to use it, but I don't know how to implement it properly
   

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