NAME

       npm-dedupe - 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 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 help ls

       • npm help update

       • npm help install

                                            April 2020                              NPM-DEDUPE(1)