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  12. <h1><a href="../cli/npm-dedupe.html">npm-dedupe</a></h1> <p>Reduce duplication</p>
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  13. <h2 id="synopsis">SYNOPSIS</h2>
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  14. <pre><code>npm dedupe [package names...]
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  15. npm ddp [package names...]
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  16. </code></pre><h2 id="description">DESCRIPTION</h2>
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  17. <p>Searches the local package tree and attempts to simplify the overall
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  18. structure by moving dependencies further up the tree, where they can
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  19. be more effectively shared by multiple dependent packages.</p>
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  20. <p>For example, consider this dependency graph:</p>
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  21. <pre><code>a
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  22. +-- b &lt;-- depends on c@1.0.x
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  23. |   `-- c@1.0.3
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  24. `-- d &lt;-- depends on c@~1.0.9
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  25.     `-- c@1.0.10
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  26. </code></pre><p>In this case, <code><a href="../cli/npm-dedupe.html">npm-dedupe(1)</a></code> will transform the tree to:</p>
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  27. <pre><code>a
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  28. +-- b
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  29. +-- d
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  30. `-- c@1.0.10
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  31. </code></pre><p>Because of the hierarchical nature of node&#39;s module lookup, b and d
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  32. will both get their dependency met by the single c package at the root
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  33. level of the tree.</p>
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  34. <p>If a suitable version exists at the target location in the tree
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  35. already, then it will be left untouched, but the other duplicates will
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  36. be deleted.</p>
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  37. <p>If no suitable version can be found, then a warning is printed, and
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  38. nothing is done.</p>
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  39. <p>If any arguments are supplied, then they are filters, and only the
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  40. named packages will be touched.</p>
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  41. <p>Note that this operation transforms the dependency tree, and may
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  42. result in packages getting updated versions, perhaps from the npm
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  43. registry.</p>
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  44. <p>This feature is experimental, and may change in future versions.</p>
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  45. <p>The <code>--tag</code> argument will apply to all of the affected dependencies. If a
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  46. tag with the given name exists, the tagged version is preferred over newer
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  47. versions.</p>
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  48. <h2 id="see-also">SEE ALSO</h2>
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  49. <ul>
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  50. <li><a href="../cli/npm-ls.html">npm-ls(1)</a></li>
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  51. <li><a href="../cli/npm-update.html">npm-update(1)</a></li>
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  52. <li><a href="../cli/npm-install.html">npm-install(1)</a></li>
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  53. </ul>
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  55. </div>
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  57. <table border=0 cellspacing=0 cellpadding=0 id=npmlogo>
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  58. <tr><td style="width:180px;height:10px;background:rgb(237,127,127)" colspan=18>&nbsp;</td></tr>
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  59. <tr><td rowspan=4 style="width:10px;height:10px;background:rgb(237,127,127)">&nbsp;</td><td style="width:40px;height:10px;background:#fff" colspan=4>&nbsp;</td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=4>&nbsp;</td><td style="width:40px;height:10px;background:#fff" colspan=4>&nbsp;</td><td rowspan=4 style="width:10px;height:10px;background:rgb(237,127,127)">&nbsp;</td><td colspan=6 style="width:60px;height:10px;background:#fff">&nbsp;</td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=4>&nbsp;</td></tr>
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  60. <tr><td colspan=2 style="width:20px;height:30px;background:#fff" rowspan=3>&nbsp;</td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=3>&nbsp;</td><td style="width:10px;height:10px;background:#fff" rowspan=3>&nbsp;</td><td style="width:20px;height:10px;background:#fff" rowspan=4 colspan=2>&nbsp;</td><td style="width:10px;height:20px;background:rgb(237,127,127)" rowspan=2>&nbsp;</td><td style="width:10px;height:10px;background:#fff" rowspan=3>&nbsp;</td><td style="width:20px;height:10px;background:#fff" rowspan=3 colspan=2>&nbsp;</td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=3>&nbsp;</td><td style="width:10px;height:10px;background:#fff" rowspan=3>&nbsp;</td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=3>&nbsp;</td></tr>
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  64. <tr><td colspan=5 style="width:50px;height:10px;background:#fff">&nbsp;</td><td style="width:40px;height:10px;background:rgb(237,127,127)" colspan=4>&nbsp;</td><td style="width:90px;height:10px;background:#fff" colspan=9>&nbsp;</td></tr>
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  65. </table>
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  66. <p id="footer">npm-dedupe &mdash; npm@1.4.14</p>
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