Install a project with a clean slate
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
npm ci in that project
$ npm ci added 154 packages in 5s
Configure Travis to build using
npm ci instead of
# .travis.yml install: - npm ci # keep the npm cache around to speed up installs cache: directories: - "$HOME/.npm"
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. 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:
npm ciwill exit with an error, instead of updating the package lock.
npm cican only install entire projects at a time: individual dependencies cannot be added with this command.
node_modulesis already present, it will be automatically removed before
npm cibegins its install.
package.jsonor any of the package-locks: installs are essentially frozen.