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node_modules/npm/doc/cli/npm-dedupe.md

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+npm-dedupe(1) -- Reduce duplication
+===================================
+
+## SYNOPSIS
+
+    npm dedupe [package names...]
+    npm ddp [package names...]
+
+    aliases: find-dupes, ddp
+
+## DESCRIPTION
+
+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.
+
+## SEE ALSO
+
+* npm-ls(1)
+* npm-update(1)
+* npm-install(1)