npm-ciInstall a project with a clean slate
Make sure you have a package-lock and an up-to-date install:
$ cd ./my/npm/project$ npm installadded 154 packages in 10s$ ls | grep package-lock
npm ci in that project
$ npm ciadded 154 packages in 5s
Configure Travis to build using
npm ci instead of
# .travis.ymlinstall:- npm ci# keep the npm cache around to speed up installscache:directories:- "$HOME/.npm"
This command is similar to
npm 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
- If dependencies in the package lock do not match those in
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.
- If a
node_modulesis already present, it will be automatically removed before
npm cibegins its install.
- It will never write to
package.jsonor any of the package-locks: installs are essentially frozen.