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.\" Generated with Ronnjs 0.3.8
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.\" http://github.com/kapouer/ronnjs/
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.
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.TH "NPM\-DEDUPE" "1" "November 2013" "" ""
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.
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.SH "NAME"
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\fBnpm-dedupe\fR \-\- Reduce duplication
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.
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.SH "SYNOPSIS"
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.
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.nf
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npm dedupe [package names\.\.\.]
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npm ddp [package names\.\.\.]
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.
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.fi
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.
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.SH "DESCRIPTION"
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Searches the local package tree and attempts to simplify the overall
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structure by moving dependencies further up the tree, where they can
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be more effectively shared by multiple dependent packages\.
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.
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.P
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For example, consider this dependency graph:
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.
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.IP "" 4
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.
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.nf
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a
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+\-\- b <\-\- depends on c@1\.0\.x
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| `\-\- c@1\.0\.3
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`\-\- d <\-\- depends on c@~1\.0\.9
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`\-\- c@1\.0\.10
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.
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.fi
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.
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.IP "" 0
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.
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.P
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npm help In this case, \fBnpm\-dedupe\fR will transform the tree to:
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.
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.IP "" 4
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.
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.nf
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a
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+\-\- b
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+\-\- d
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`\-\- c@1\.0\.10
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.
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.fi
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.
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.IP "" 0
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.
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.P
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Because of the hierarchical nature of node\'s module lookup, b and d
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will both get their dependency met by the single c package at the root
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level of the tree\.
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.
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.P
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If a suitable version exists at the target location in the tree
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already, then it will be left untouched, but the other duplicates will
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be deleted\.
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.
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.P
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If no suitable version can be found, then a warning is printed, and
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nothing is done\.
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.
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.P
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If any arguments are supplied, then they are filters, and only the
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named packages will be touched\.
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.
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.P
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Note that this operation transforms the dependency tree, and may
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result in packages getting updated versions, perhaps from the npm
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registry\.
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.
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.P
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This feature is experimental, and may change in future versions\.
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.
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.P
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The \fB\-\-tag\fR argument will apply to all of the affected dependencies\. If a
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tag with the given name exists, the tagged version is preferred over newer
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versions\.
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.
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.SH "SEE ALSO"
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.
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.IP "\(bu" 4
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npm help ls
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.
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.IP "\(bu" 4
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npm help update
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.
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.IP "\(bu" 4
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npm help install
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.
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.IP "" 0
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