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PR-URL: https://github.com/nodejs/node/pull/30533 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
68 lines
1.4 KiB
Markdown
68 lines
1.4 KiB
Markdown
---
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section: cli-commands
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title: npm-dedupe
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description: Reduce duplication
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---
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# npm-dedupe(1)
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## Reduce duplication
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### Synopsis
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```bash
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npm dedupe
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npm ddp
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aliases: find-dupes, ddp
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```
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### Description
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Searches the local package tree and attempts to simplify the overall
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structure by moving dependencies further up the tree, where they can
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be more effectively shared by multiple dependent packages.
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For example, consider this dependency graph:
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```bash
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a
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+-- b <-- depends on c@1.0.x
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| `-- c@1.0.3
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`-- d <-- depends on c@~1.0.9
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`-- c@1.0.10
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```
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In this case, `npm dedupe` will transform the tree to:
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```bash
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a
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+-- b
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+-- d
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`-- c@1.0.10
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```
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Because of the hierarchical nature of node's module lookup, b and d
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will both get their dependency met by the single c package at the root
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level of the tree.
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The deduplication algorithm walks the tree, moving each dependency as far
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up in the tree as possible, even if duplicates are not found. This will
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result in both a flat and deduplicated tree.
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If a suitable version exists at the target location in the tree
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already, then it will be left untouched, but the other duplicates will
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be deleted.
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Arguments are ignored. Dedupe always acts on the entire tree.
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Modules
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Note that this operation transforms the dependency tree, but will never
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result in new modules being installed.
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### See Also
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* [npm ls](/cli-commands/npm-ls)
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* [npm update](/cli-commands/npm-update)
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* [npm install](/cli-commands/npm-install)
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