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- .TH "NPM\-DEDUPE" "1" "August 2021" "" ""
- .SH "NAME"
- \fBnpm-dedupe\fR \- Reduce duplication
- .SS Synopsis
- .P
- .RS 2
- .nf
- npm dedupe
- npm ddp
- aliases: find\-dupes, ddp
- .fi
- .RE
- .SS Description
- .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
- For example, consider this dependency graph:
- .P
- .RS 2
- .nf
- a
- +\-\- b <\-\- depends on c@1\.0\.x
- | `\-\- c@1\.0\.3
- `\-\- d <\-\- depends on c@~1\.0\.9
- `\-\- c@1\.0\.10
- .fi
- .RE
- .P
- In this case, \fBnpm dedupe\fP will transform the tree to:
- .P
- .RS 2
- .nf
- a
- +\-\- b
- +\-\- d
- `\-\- c@1\.0\.10
- .fi
- .RE
- .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
- 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
- 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
- Arguments are ignored\. Dedupe always acts on the entire tree\.
- .P
- Modules
- .P
- Note that this operation transforms the dependency tree, but will never
- result in new modules being installed\.
- .SS See Also
- .RS 0
- .IP \(bu 2
- npm help ls
- .IP \(bu 2
- npm help update
- .IP \(bu 2
- npm help install
- .RE
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