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<title>dedupe</title>
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<h1><a href="../doc/dedupe.html">dedupe</a></h1> <p>Reduce duplication</p>
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<h2 id="SYNOPSIS">SYNOPSIS</h2>
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<pre><code>npm dedupe [package names...]</code></pre>
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<h2 id="DESCRIPTION">DESCRIPTION</h2>
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<p>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.</p>
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<p>For example, consider this dependency graph:</p>
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<pre><code>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</code></pre>
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<p>In this case, <code><a href="../doc/dedupe.html">dedupe(1)</a></code> will transform the tree to:</p>
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<pre><code>a
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+-- b
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+-- d
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`-- c@1.0.10</code></pre>
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<p>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.</p>
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<p>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.</p>
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<p>If no suitable version can be found, then a warning is printed, and
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nothing is done.</p>
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<p>If any arguments are supplied, then they are filters, and only the
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named packages will be touched.</p>
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<p>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.</p>
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<p>This feature is experimental, and may change in future versions.</p>
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<h2 id="SEE-ALSO">SEE ALSO</h2>
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<ul><li><a href="../doc/ls.html">ls(1)</a></li><li><a href="../doc/update.html">update(1)</a></li><li><a href="../doc/install.html">install(1)</a></li></ul>
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</div>
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<p id="footer">dedupe — npm@1.2.11</p>
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<script>
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;(function () {
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