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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
- npm ddp
-
- aliases: find-dupes, ddp</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">npm-dedupe(1)</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>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.</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>Arguments are ignored. Dedupe always acts on the entire tree.</p>
- <p>Modules</p>
- <p>Note that this operation transforms the dependency tree, but will never
- result in new modules being installed.</p>
- <h2 id="see-also">SEE ALSO</h2>
- <ul>
- <li><a href="../cli/npm-ls.html">npm-ls(1)</a></li>
- <li><a href="../cli/npm-update.html">npm-update(1)</a></li>
- <li><a href="../cli/npm-install.html">npm-install(1)</a></li>
- </ul>
-
- </div>
-
- <table border=0 cellspacing=0 cellpadding=0 id=npmlogo>
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- <tr><td style="width:60px;height:10px;background:rgb(237,127,127)" colspan=6> </td><td colspan=10 style="width:10px;height:10px;background:rgb(237,127,127)"> </td></tr>
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- </table>
- <p id="footer">npm-dedupe — npm@6.4.1</p>
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