1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
---
title: npm-dedupe
section: 1
description: Reduce duplication in the package tree
---
### Synopsis
```bash
npm dedupe
npm ddp
aliases: ddp
```
### Description
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.
For example, consider this dependency graph:
```
a
+-- b <-- depends on c@1.0.x
| `-- c@1.0.3
`-- d <-- depends on c@~1.0.9
`-- c@1.0.10
```
In this case, `npm dedupe` will transform the tree to:
```bash
a
+-- b
+-- d
`-- c@1.0.10
```
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.
In some cases, you may have a dependency graph like this:
```
a
+-- b <-- depends on c@1.0.x
+-- c@1.0.3
`-- d <-- depends on c@1.x
`-- c@1.9.9
```
During the installation process, the `c@1.0.3` dependency for `b` was
placed in the root of the tree. Though `d`'s dependency on `c@1.x` could
have been satisfied by `c@1.0.3`, the newer `c@1.9.0` dependency was used,
because npm favors updates by default, even when doing so causes
duplication.
Running `npm dedupe` will cause npm to note the duplication and
re-evaluate, deleting the nested `c` module, because the one in the root is
sufficient.
To prefer deduplication over novelty during the installation process, run
`npm install --prefer-dedupe` or `npm config set prefer-dedupe true`.
Arguments are ignored. Dedupe always acts on the entire tree.
Note that this operation transforms the dependency tree, but will never
result in new modules being installed.
Using `npm find-dupes` will run the command in `--dry-run` mode.
### Configuration
<!-- AUTOGENERATED CONFIG DESCRIPTIONS START -->
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `global-style`
* Default: false
* Type: Boolean
Causes npm to install the package into your local `node_modules` folder with
the same layout it uses with the global `node_modules` folder. Only your
direct dependencies will show in `node_modules` and everything they depend
on will be flattened in their `node_modules` folders. This obviously will
eliminate some deduping. If used with `legacy-bundling`, `legacy-bundling`
will be preferred.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `legacy-bundling`
* Default: false
* Type: Boolean
Causes npm to install the package such that versions of npm prior to 1.4,
such as the one included with node 0.8, can install the package. This
eliminates all automatic deduping. If used with `global-style` this option
will be preferred.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `strict-peer-deps`
* Default: false
* Type: Boolean
If set to `true`, and `--legacy-peer-deps` is not set, then _any_
conflicting `peerDependencies` will be treated as an install failure, even
if npm could reasonably guess the appropriate resolution based on non-peer
dependency relationships.
By default, conflicting `peerDependencies` deep in the dependency graph will
be resolved using the nearest non-peer dependency specification, even if
doing so will result in some packages receiving a peer dependency outside
the range set in their package's `peerDependencies` object.
When such and override is performed, a warning is printed, explaining the
conflict and the packages involved. If `--strict-peer-deps` is set, then
this warning is treated as a failure.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `package-lock`
* Default: true
* Type: Boolean
If set to false, then ignore `package-lock.json` files when installing. This
will also prevent _writing_ `package-lock.json` if `save` is true.
When package package-locks are disabled, automatic pruning of extraneous
modules will also be disabled. To remove extraneous modules with
package-locks disabled use `npm prune`.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `omit`
* Default: 'dev' if the `NODE_ENV` environment variable is set to
'production', otherwise empty.
* Type: "dev", "optional", or "peer" (can be set multiple times)
Dependency types to omit from the installation tree on disk.
Note that these dependencies _are_ still resolved and added to the
`package-lock.json` or `npm-shrinkwrap.json` file. They are just not
physically installed on disk.
If a package type appears in both the `--include` and `--omit` lists, then
it will be included.
If the resulting omit list includes `'dev'`, then the `NODE_ENV` environment
variable will be set to `'production'` for all lifecycle scripts.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `ignore-scripts`
* Default: false
* Type: Boolean
If true, npm does not run scripts specified in package.json files.
Note that commands explicitly intended to run a particular script, such as
`npm start`, `npm stop`, `npm restart`, `npm test`, and `npm run-script`
will still run their intended script if `ignore-scripts` is set, but they
will *not* run any pre- or post-scripts.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `audit`
* Default: true
* Type: Boolean
When "true" submit audit reports alongside the current npm command to the
default registry and all registries configured for scopes. See the
documentation for [`npm audit`](/commands/npm-audit) for details on what is
submitted.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `bin-links`
* Default: true
* Type: Boolean
Tells npm to create symlinks (or `.cmd` shims on Windows) for package
executables.
Set to false to have it not do this. This can be used to work around the
fact that some file systems don't support symlinks, even on ostensibly Unix
systems.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `fund`
* Default: true
* Type: Boolean
When "true" displays the message at the end of each `npm install`
acknowledging the number of dependencies looking for funding. See [`npm
fund`](/commands/npm-fund) for details.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `dry-run`
* Default: false
* Type: Boolean
Indicates that you don't want npm to make any changes and that it should
only report what it would have done. This can be passed into any of the
commands that modify your local installation, eg, `install`, `update`,
`dedupe`, `uninstall`, as well as `pack` and `publish`.
Note: This is NOT honored by other network related commands, eg `dist-tags`,
`owner`, etc.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `workspace`
* Default:
* Type: String (can be set multiple times)
Enable running a command in the context of the configured workspaces of the
current project while filtering by running only the workspaces defined by
this configuration option.
Valid values for the `workspace` config are either:
* Workspace names
* Path to a workspace directory
* Path to a parent workspace directory (will result in selecting all
workspaces within that folder)
When set for the `npm init` command, this may be set to the folder of a
workspace which does not yet exist, to create the folder and set it up as a
brand new workspace within the project.
This value is not exported to the environment for child processes.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `workspaces`
* Default: null
* Type: null or Boolean
Set to true to run the command in the context of **all** configured
workspaces.
Explicitly setting this to false will cause commands like `install` to
ignore workspaces altogether. When not set explicitly:
- Commands that operate on the `node_modules` tree (install, update, etc.)
will link workspaces into the `node_modules` folder. - Commands that do
other things (test, exec, publish, etc.) will operate on the root project,
_unless_ one or more workspaces are specified in the `workspace` config.
This value is not exported to the environment for child processes.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
#### `include-workspace-root`
* Default: false
* Type: Boolean
Include the workspace root when workspaces are enabled for a command.
When false, specifying individual workspaces via the `workspace` config, or
all workspaces via the `workspaces` flag, will cause npm to operate only on
the specified workspaces, and not on the root project.
<!-- automatically generated, do not edit manually -->
<!-- see lib/utils/config/definitions.js -->
<!-- AUTOGENERATED CONFIG DESCRIPTIONS END -->
### See Also
* [npm find-dupes](/commands/npm-find-dupes)
* [npm ls](/commands/npm-ls)
* [npm update](/commands/npm-update)
* [npm install](/commands/npm-install)
|