311 lines
9.4 KiB
Markdown
311 lines
9.4 KiB
Markdown
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---
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title: npm-dedupe
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section: 1
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description: Reduce duplication in the package tree
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---
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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: 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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```
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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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In some cases, you may have a dependency graph like this:
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```
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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.x
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`-- c@1.9.9
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```
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During the installation process, the `c@1.0.3` dependency for `b` was
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placed in the root of the tree. Though `d`'s dependency on `c@1.x` could
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have been satisfied by `c@1.0.3`, the newer `c@1.9.0` dependency was used,
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because npm favors updates by default, even when doing so causes
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duplication.
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Running `npm dedupe` will cause npm to note the duplication and
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re-evaluate, deleting the nested `c` module, because the one in the root is
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sufficient.
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To prefer deduplication over novelty during the installation process, run
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`npm install --prefer-dedupe` or `npm config set prefer-dedupe true`.
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Arguments are ignored. Dedupe always acts on the entire tree.
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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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Using `npm find-dupes` will run the command in `--dry-run` mode.
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Note that by default `npm dedupe` will not update the semver values of direct
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dependencies in your project `package.json`, if you want to also update
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values in `package.json` you can run: `npm dedupe --save` (or add the
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`save=true` option to a [configuration file](/configuring-npm/npmrc)
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to make that the default behavior).
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### Configuration
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<!-- AUTOGENERATED CONFIG DESCRIPTIONS START -->
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `global-style`
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* Default: false
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* Type: Boolean
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Causes npm to install the package into your local `node_modules` folder with
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the same layout it uses with the global `node_modules` folder. Only your
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direct dependencies will show in `node_modules` and everything they depend
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on will be flattened in their `node_modules` folders. This obviously will
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eliminate some deduping. If used with `legacy-bundling`, `legacy-bundling`
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will be preferred.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `legacy-bundling`
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* Default: false
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* Type: Boolean
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Causes npm to install the package such that versions of npm prior to 1.4,
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such as the one included with node 0.8, can install the package. This
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eliminates all automatic deduping. If used with `global-style` this option
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will be preferred.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `strict-peer-deps`
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* Default: false
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* Type: Boolean
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If set to `true`, and `--legacy-peer-deps` is not set, then _any_
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conflicting `peerDependencies` will be treated as an install failure, even
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if npm could reasonably guess the appropriate resolution based on non-peer
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dependency relationships.
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By default, conflicting `peerDependencies` deep in the dependency graph will
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be resolved using the nearest non-peer dependency specification, even if
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doing so will result in some packages receiving a peer dependency outside
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the range set in their package's `peerDependencies` object.
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When such and override is performed, a warning is printed, explaining the
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conflict and the packages involved. If `--strict-peer-deps` is set, then
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this warning is treated as a failure.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `package-lock`
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* Default: true
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* Type: Boolean
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If set to false, then ignore `package-lock.json` files when installing. This
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will also prevent _writing_ `package-lock.json` if `save` is true.
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When package package-locks are disabled, automatic pruning of extraneous
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modules will also be disabled. To remove extraneous modules with
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package-locks disabled use `npm prune`.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `omit`
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* Default: 'dev' if the `NODE_ENV` environment variable is set to
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'production', otherwise empty.
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* Type: "dev", "optional", or "peer" (can be set multiple times)
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Dependency types to omit from the installation tree on disk.
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Note that these dependencies _are_ still resolved and added to the
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`package-lock.json` or `npm-shrinkwrap.json` file. They are just not
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physically installed on disk.
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If a package type appears in both the `--include` and `--omit` lists, then
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it will be included.
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If the resulting omit list includes `'dev'`, then the `NODE_ENV` environment
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variable will be set to `'production'` for all lifecycle scripts.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `ignore-scripts`
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* Default: false
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* Type: Boolean
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If true, npm does not run scripts specified in package.json files.
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Note that commands explicitly intended to run a particular script, such as
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`npm start`, `npm stop`, `npm restart`, `npm test`, and `npm run-script`
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will still run their intended script if `ignore-scripts` is set, but they
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will *not* run any pre- or post-scripts.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `audit`
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* Default: true
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* Type: Boolean
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When "true" submit audit reports alongside the current npm command to the
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default registry and all registries configured for scopes. See the
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documentation for [`npm audit`](/commands/npm-audit) for details on what is
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submitted.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `bin-links`
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* Default: true
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* Type: Boolean
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Tells npm to create symlinks (or `.cmd` shims on Windows) for package
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executables.
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Set to false to have it not do this. This can be used to work around the
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fact that some file systems don't support symlinks, even on ostensibly Unix
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systems.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `fund`
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* Default: true
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* Type: Boolean
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When "true" displays the message at the end of each `npm install`
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acknowledging the number of dependencies looking for funding. See [`npm
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fund`](/commands/npm-fund) for details.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `dry-run`
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* Default: false
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* Type: Boolean
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Indicates that you don't want npm to make any changes and that it should
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only report what it would have done. This can be passed into any of the
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commands that modify your local installation, eg, `install`, `update`,
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`dedupe`, `uninstall`, as well as `pack` and `publish`.
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Note: This is NOT honored by other network related commands, eg `dist-tags`,
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`owner`, etc.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `workspace`
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* Default:
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* Type: String (can be set multiple times)
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Enable running a command in the context of the configured workspaces of the
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current project while filtering by running only the workspaces defined by
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this configuration option.
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Valid values for the `workspace` config are either:
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* Workspace names
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* Path to a workspace directory
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* Path to a parent workspace directory (will result in selecting all
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workspaces within that folder)
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When set for the `npm init` command, this may be set to the folder of a
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workspace which does not yet exist, to create the folder and set it up as a
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brand new workspace within the project.
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This value is not exported to the environment for child processes.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `workspaces`
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* Default: null
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* Type: null or Boolean
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Set to true to run the command in the context of **all** configured
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workspaces.
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Explicitly setting this to false will cause commands like `install` to
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ignore workspaces altogether. When not set explicitly:
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- Commands that operate on the `node_modules` tree (install, update, etc.)
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will link workspaces into the `node_modules` folder. - Commands that do
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other things (test, exec, publish, etc.) will operate on the root project,
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_unless_ one or more workspaces are specified in the `workspace` config.
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This value is not exported to the environment for child processes.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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#### `include-workspace-root`
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* Default: false
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* Type: Boolean
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Include the workspace root when workspaces are enabled for a command.
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When false, specifying individual workspaces via the `workspace` config, or
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all workspaces via the `workspaces` flag, will cause npm to operate only on
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the specified workspaces, and not on the root project.
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<!-- automatically generated, do not edit manually -->
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<!-- see lib/utils/config/definitions.js -->
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<!-- AUTOGENERATED CONFIG DESCRIPTIONS END -->
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### See Also
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* [npm find-dupes](/commands/npm-find-dupes)
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* [npm ls](/commands/npm-ls)
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* [npm update](/commands/npm-update)
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* [npm install](/commands/npm-install)
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