R: use magrittr pipe operator in self written package

It should have worked correctly if you had magrittr listed in Depends. However, this is not advised. Instead, you leave magrittr in Imports and add the following line to NAMESPACE:

importFrom(magrittr,"%>%")

I suggest reading Writing R extensions. Your question is covered in paragraphs 1.1.3 and 1.5.1.

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