Adds optional callback method (logger) for Observable.log/spy() #315
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I have a use-case where I would like to log/spy using function other than
console.log
and I don't want to override thelog
method onconsole
. This PR should make this possible.(Ofc, it is possible to simply wrap the observer and build the desired functionality yourself, but it would be more convenient, if this option comes from library itself.)
PS. Looks like CI pipelines for Node 6/8 are broken.