1NPM-DEDUPE(1)                                                    NPM-DEDUPE(1)
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NAME

6       npm-dedupe - Reduce duplication
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8   Synopsis
9         npm dedupe
10         npm ddp
11
12         aliases: find-dupes, ddp
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14   Description
15       Searches  the  local  package tree and attempts to simplify the overall
16       structure by moving dependencies further up the tree, where they can be
17       more effectively shared by multiple dependent packages.
18
19       For example, consider this dependency graph:
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21         a
22         +-- b <-- depends on c@1.0.x
23         |   `-- c@1.0.3
24         `-- d <-- depends on c@~1.0.9
25             `-- c@1.0.10
26
27       In this case, npm dedupe will transform the tree to:
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29         a
30         +-- b
31         +-- d
32         `-- c@1.0.10
33
34       Because  of  the  hierarchical  nature of node's module lookup, b and d
35       will both get their dependency met by the single c package at the  root
36       level of the tree.
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38       The  deduplication  algorithm walks the tree, moving each dependency as
39       far up in the tree as possible, even if duplicates are not found.  This
40       will result in both a flat and deduplicated tree.
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42       If  a  suitable  version  exists  at  the  target  location in the tree
43       already, then it will be left untouched, but the other duplicates  will
44       be deleted.
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46       Arguments are ignored. Dedupe always acts on the entire tree.
47
48       Modules
49
50       Note that this operation transforms the dependency tree, but will never
51       result in new modules being installed.
52
53   See Also
54       · npm help ls
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56       · npm help update
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58       · npm help install
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63                                 February 2021                   NPM-DEDUPE(1)