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

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+npm-dedupe(1) -- Reduce duplication
+===================================
+
+## SYNOPSIS
+
+    npm dedupe
+    npm ddp
+
+    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.
+
+The deduplication algorithm walks the tree, moving each dependency as far
+up in the tree as possible, even if duplicates are not found. This will
+result in both a flat and deduplicated 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.
+
+Arguments are ignored. Dedupe always acts on the entire tree.
+
+Modules
+
+Note that this operation transforms the dependency tree, but will never
+result in new modules being installed.
+
+## SEE ALSO
+
+* npm-ls(1)
+* npm-update(1)
+* npm-install(1)