> For example, if I have a module for emailing with a send() method on it,
I don't have it export a constructor; I have it export an object.  That
object might maintain some state or it might not.  When the module is
subsequently require()'d, it will have any state that it has accumulated
since.

For.most of the time, that's unnecessary - multiple require() calls for the
same module return same, cached module, so you can store state just by
using local variables in that module.

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