NG0600: Writing to signals is not allowed in a `computed`

WHy am I getting the error: NG0600: Writing to signals is not allowed in a `computed`. yet I am using a writable signal?

Below is the code

dialog = signal(false)


openDialog(action: 'edit' | 'create') {
this.dialog.update(action => action = !action)
return action
}

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