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< h1 > < a href = "../cli/npm-dedupe.html" > npm-dedupe< / a > < / h1 > < p > Reduce duplication< / p >
< h2 id = "synopsis" > SYNOPSIS< / h2 >
< pre > < code > npm dedupe [package names...]
npm ddp [package names...]
< / code > < / pre > < h2 id = "description" > DESCRIPTION< / h2 >
< p > 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.< / p >
< p > For example, consider this dependency graph:< / p >
< pre > < code > a
+-- b < -- depends on c@1.0.x
| `-- c@1.0.3
`-- d < -- depends on c@~1.0.9
`-- c@1.0.10
< / code > < / pre > < p > In this case, < code > < a href = "../cli/npm-dedupe.html" > < a href = "../cli/npm-dedupe.html" > npm-dedupe(1)< / a > < / a > < / code > will transform the tree to:< / p >
< pre > < code > a
+-- b
+-- d
`-- c@1.0.10
< / code > < / pre > < p > 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.< / p >
< p > 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.< / p >
< p > If no suitable version can be found, then a warning is printed, and
nothing is done.< / p >
< p > If any arguments are supplied, then they are filters, and only the
named packages will be touched.< / p >
< p > Note that this operation transforms the dependency tree, and may
result in packages getting updated versions, perhaps from the npm
registry.< / p >
< p > This feature is experimental, and may change in future versions.< / p >
< p > The < code > --tag< / code > 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.< / p >
< h2 id = "see-also" > SEE ALSO< / h2 >
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< li > < a href = "../cli/npm-ls.html" > < a href = "../cli/npm-ls.html" > npm-ls(1)< / a > < / a > < / li >
< li > < a href = "../cli/npm-update.html" > < a href = "../cli/npm-update.html" > npm-update(1)< / a > < / a > < / li >
< li > < a href = "../cli/npm-install.html" > < a href = "../cli/npm-install.html" > npm-install(1)< / a > < / a > < / li >
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< p id = "footer" > npm-dedupe — npm@2.13.3< / p >
