tra-analysis/website/node_modules/npm/doc/cli/npm-ci.md
2019-01-06 13:14:45 -06:00

1.8 KiB

npm-ci(1) -- 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-install(1), 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-install(1)
  • npm-package-locks(5)