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<h1 id="npm-dedupe">npm-dedupe</h1>
<span class="description">Reduce duplication in the package tree</span>
</header>
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<h2 id="table-of-contents">Table of contents</h2>
<div id="_table_of_contents"><ul><li><a href="#synopsis">Synopsis</a></li><li><a href="#description">Description</a></li><li><a href="#see-also">See Also</a></li></ul></div>
</section>
<div id="_content"><h3 id="synopsis">Synopsis</h3>
<pre lang="bash"><code>npm dedupe
npm ddp
aliases: ddp
</code></pre>
<h3 id="description">Description</h3>
<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>npm dedupe</code> will transform the tree to:</p>
<pre lang="bash"><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>In some cases, you may have a dependency graph like this:</p>
<pre><code>a
+-- b <-- depends on c@1.0.x
+-- c@1.0.3
`-- d <-- depends on c@1.x
`-- c@1.9.9
</code></pre>
<p>During the installation process, the <code>c@1.0.3</code> dependency for <code>b</code> was
placed in the root of the tree. Though <code>d</code>’s dependency on <code>c@1.x</code> could
have been satisfied by <code>c@1.0.3</code>, the newer <code>c@1.9.0</code> dependency was used,
because npm favors updates by default, even when doing so causes
duplication.</p>
<p>Running <code>npm dedupe</code> will cause npm to note the duplication and
re-evaluate, deleting the nested <code>c</code> module, because the one in the root is
sufficient.</p>
<p>To prefer deduplication over novelty during the installation process, run
<code>npm install --prefer-dedupe</code> or <code>npm config set prefer-dedupe true</code>.</p>
<p>Arguments are ignored. Dedupe always acts on the entire tree.</p>
<p>Note that this operation transforms the dependency tree, but will never
result in new modules being installed.</p>
<p>Using <code>npm find-dupes</code> will run the command in <code>--dry-run</code> mode.</p>
<h3 id="see-also">See Also</h3>
<ul>
<li><a href="../cli-commands/find-dupes.html">npm find-dupes</a></li>
<li><a href="../cli-commands/ls.html">npm ls</a></li>
<li><a href="../cli-commands/update.html">npm update</a></li>
<li><a href="../cli-commands/install.html">npm install</a></li>
</ul>
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