npm5 equivalent to yarn's --pure-lockfile flag

Question

I'm looking for an equivalent for yarn's --pure-lockfile flag.

This flag is useful when installing dependencies in CI, when you want it to read your lockfile but not modify it.

Does npm v5 have an equivalent?

Answer 1

npm 5.7 introduced the npm ci subcommand:

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.

Answer 2

this is how I did in my dockerfile

RUN npm install --pure-lockfile

it should work perfect.