Reduce duplication
+npm dedupe [package names...]
+npm ddp [package names...]
+
+aliases: find-dupes, ddp
+Searches the local package tree and attempts to simplify the overall +structure by moving dependencies further up the tree, where they can +be more effectively shared by multiple dependent packages.
+For example, consider this dependency graph:
+a
++-- b <-- depends on c@1.0.x
+| `-- c@1.0.3
+`-- d <-- depends on c@~1.0.9
+ `-- c@1.0.10
+In this case, npm-dedupe(1) will transform the tree to:
a
++-- b
++-- d
+`-- c@1.0.10
+Because of the hierarchical nature of node's module lookup, b and d +will both get their dependency met by the single c package at the root +level of the tree.
+If a suitable version exists at the target location in the tree +already, then it will be left untouched, but the other duplicates will +be deleted.
+If no suitable version can be found, then a warning is printed, and +nothing is done.
+If any arguments are supplied, then they are filters, and only the +named packages will be touched.
+Note that this operation transforms the dependency tree, and may +result in packages getting updated versions, perhaps from the npm +registry.
+This feature is experimental, and may change in future versions.
+The --tag argument will apply to all of the affected dependencies. If a
+tag with the given name exists, the tagged version is preferred over newer
+versions.