npm-ci (1) Linux Manual Page

NAME

npm-ci – Install a project with a clean slate

Synopsis

npm ci

Example

Make sure you have a package-lock and an up-to-date install:

$ cd ./my/npm/project
$ npm install
added 154 packages in 10s
$ ls | grep package-lock

Run npm ci in that project

$ npm ci
added 154 packages in 5s

Configure Travis to build using npm ci instead of npm install:

# .travis.yml
install:
- npm ci
# keep the npm cache around to speed up installs
cache:
  directories:
  - "$HOME/.npm"

Description

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. It can be significantly faster than a regular npm install by skipping certain user-oriented features. It is also more strict than a regular install, which can help catch errors or inconsistencies caused by the incrementally-installed local environments of most npm users.

In short, the main differences between using npm install and npm ci are:

•

The project must have an existing package-lock.json or npm-shrinkwrap.json.

•

If dependencies in the package lock do not match those in package.json, npm ci will exit with an error, instead of updating the package lock.

•

npm ci can only install entire projects at a time: individual dependencies cannot be added with this command.

•

If a node_modules is already present, it will be automatically removed before npm ci begins its install.

•

It will never write to package.json or any of the package-locks: installs are essentially frozen.

See Also

•

npm help install

•

npm help package-locks

Index