It seems that the functions of interest are not exported from the package.
If you use ls(package:randomForest) , you will get a list of exported functions.
If you want to see all the available functions, use: ls(getNamespace("randomForest"), all.names=TRUE) . Thanks @Joshua. You will see the features you want there.
To access one of them explicitly, use: randomForest:::predict.randomForest() or just create an object that inherits the class "randomForest" and calls predict() on it directly.
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