For anyone else who battled trying to hijack this type of function here is 
the solution:
config.formatterHelpers.enclosedTextHelper_old = 
config.formatterHelpers.enclosedTextHelper;
config.formatterHelpers.enclosedTextHelper = function(w) {
config.formatterHelpers.enclosedTextHelper_old.call(this, w);
prettyPrint();
}

Thie "magic" seems to be this .call(this, w) but I can't explain what 
exactly is going on here.

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