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CircleCI provides documentation for Yarn. You can get up and running by following their Yarn documentation. Yarn is pre-installed Codeship Basic. If you are using Codeship Pro (with Docker), it is recommended to install Yarn via our Debian/Ubuntu package instead.
Yarn version 1 and NPM both manage dependencies in a very similar way. They both store project metadata in the package. json file, located in the node_modules folder inside the project directory. Starting from version 2, Yarn no longer uses the node_modules folder to track dependencies.
npm ci: CI stands for clean install and npm ci is used to install all exact version dependencies or devDependencies from a package-lock. json file. Syntax: npm ci.
Installing project dependencies To install the packages with Yarn, we run the yarn command. Yarn installs packages in parallel, which is one of the reasons it's quicker than npm. If you're using Yarn 1, you'll see that the yarn output logs are clean, visually distinguishable and brief.
I believe it's as simple as that:
yarn install --frozen-lockfile
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
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"
},
...
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-cacheoption 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.
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