What is the closest to `npm ci` in yarn

NpmYarnpkg

Npm Problem Overview

In npm, there's a ci command for installing the project with a clean state. In the documentation, it is claimed that:

> 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.

What is the closest equivalent of the npm ci command in yarn world? Maybe the answer is that we don't need this in yarn because its architecture is such that we don't need a special mode. Maybe the answer is to use a bunch of configuration settings. However, I'm failing to find a single complete answer to this question and I believe it would be valuable to have it.

Npm Solutions

Solution 1 - Npm

I believe it's as simple as that:

yarn install --frozen-lockfile

Solution 2 - Npm

Unfortunately, because of the way yarn module resolution works, just doing yarn install --frozen-lockfile is sometimes not enough. You can still be left with transitive deps that are invalid.

To truly get the same behavior as npm ci you must do:

rm -rf node_modules && yarn install --frozen-lockfile

Solution 3 - Npm

For newer versions of yarn you should use:

yarn install --immutable --immutable-cache --check-cache

As stated in the official Yarn docs: 

> If the --check-cache option is set [...] This is recommended as part of your CI workflow if you're both following the Zero-Installs model and accepting PRs from third-parties, as they'd otherwise have the ability to alter the checked-in packages before submitting them.

Solution 4 - Npm

building off of @Crafty_Shadow's recommendation, I make it a bit more integrated.

package.json

  ...
  "scripts": {
    ...
    "preci": "rm -fr node_modules",
    "ci": "yarn install --frozen-lockfile"
  },
  ...
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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionshabuncView Question on Stackoverflow
Solution 1 - Npmfab67View Answer on Stackoverflow
Solution 2 - NpmVanTanevView Answer on Stackoverflow
Solution 3 - NpmKutyelView Answer on Stackoverflow
Solution 4 - NpmMike LPView Answer on Stackoverflow