This command is similar to npm help install, except it's meant to be used in automated environments such as test platforms, continuous integration, and deployment -- or any situation where you want to make sure you're doing a clean install of your dependencies.
The project \fBmust\fR have an existing \fBpackage-lock.json\fR or \fBnpm-shrinkwrap.json\fR.
.IP\(bu4
If dependencies in the package lock do not match those in \fBpackage.json\fR, \fBnpm ci\fR will exit with an error, instead of updating the package lock.
.IP\(bu4
\fBnpm ci\fR can only install entire projects at a time: individual dependencies cannot be added with this command.
.IP\(bu4
If a \fBnode_modules\fR is already present, it will be automatically removed before \fBnpm ci\fR begins its install.
.IP\(bu4
It will never write to \fBpackage.json\fR or any of the package-locks: installs are essentially frozen.
NOTE: If you create your \fBpackage-lock.json\fR file by running \fBnpm install\fR with flags that can affect the shape of your dependency tree, such as \fB--legacy-peer-deps\fR or \fB--install-links\fR, you \fImust\fR provide the same flags to \fBnpm ci\fR or you are likely to encounter errors. An easy way to do this is to run, for example, \fBnpm config set legacy-peer-deps=true --location=project\fR and commit the \fB.npmrc\fR file to your repo.
Sets the strategy for installing packages in node_modules. hoisted (default): Install non-duplicated in top-level, and duplicated as necessary within directory structure. nested: (formerly --legacy-bundling) install in place, no hoisting. shallow (formerly --global-style) only install direct deps at top-level. linked: (experimental) install in node_modules/.store, link in place, unhoisted.
Instead of hoisting package installs in \fBnode_modules\fR, install packages in the same manner that they are depended on. This may cause very deep directory structures and duplicate package installs as there is no de-duplicating. Sets \fB--install-strategy=nested\fR.
Note that these dependencies \fIare\fR still resolved and added to the \fBpackage-lock.json\fR or \fBnpm-shrinkwrap.json\fR file. They are just not physically installed on disk.
If the resulting omit list includes \fB'dev'\fR, then the \fBNODE_ENV\fR environment variable will be set to \fB'production'\fR for all lifecycle scripts.
If set to \fBtrue\fR, and \fB--legacy-peer-deps\fR is not set, then \fIany\fR conflicting \fBpeerDependencies\fR 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 \fBpeerDependencies\fR 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 \fBpeerDependencies\fR object.
When such an override is performed, a warning is printed, explaining the conflict and the packages involved. If \fB--strict-peer-deps\fR is set, then this warning is treated as a failure.
Run all build scripts (ie, \fBpreinstall\fR, \fBinstall\fR, and \fBpostinstall\fR) scripts for installed packages in the foreground process, sharing standard input, output, and error with the main npm process.
Note that commands explicitly intended to run a particular script, such as \fBnpm start\fR, \fBnpm stop\fR, \fBnpm restart\fR, \fBnpm test\fR, and \fBnpm run-script\fR will still run their intended script if \fBignore-scripts\fR is set, but they will \fInot\fR run any pre- or post-scripts.
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 help audit for details on what is submitted.
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.
When "true" displays the message at the end of each \fBnpm install\fR acknowledging the number of dependencies looking for funding. See npm help fund for details.
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, \fBinstall\fR, \fBupdate\fR, \fBdedupe\fR, \fBuninstall\fR, as well as \fBpack\fR and \fBpublish\fR.
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.
When set for the \fBnpm init\fR 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.
Commands that operate on the \fBnode_modules\fR tree (install, update, etc.) will link workspaces into the \fBnode_modules\fR folder. - Commands that do other things (test, exec, publish, etc.) will operate on the root project, \fIunless\fR one or more workspaces are specified in the \fBworkspace\fR config.
When false, specifying individual workspaces via the \fBworkspace\fR config, or all workspaces via the \fBworkspaces\fR flag, will cause npm to operate only on the specified workspaces, and not on the root project.
When set file: protocol dependencies will be packed and installed as regular dependencies instead of creating a symlink. This option has no effect on workspaces.
