After installing an npm package like react for the first time using
yarn add react
I noticed that the .yarn-cache folder contains many files. I assume this is where yarn stores the local cache, so when I install react again in the future, it will be pulled from there, right?
If I need to reinstall react in the future, should I simply run:
yarn add react
or should I use:
yarn add react --prefer-offline
When you use yarn to install or restore a package, it typically downloads the package from the internet and stores it in the cache for future use. However, by adding the --prefer-offline flag, you can change this behavior so that yarn checks the cache first before attempting to download the package. This can speed up your installs and restores, but keep in mind that you may not always get the most up-to-date versions of packages. If you prefer to strictly rely on your local cache, you can use the --offline option which will raise an error if the package is not found in the cache.
For more information, visit https://yarnpkg.com/blog/2016/11/24/offline-mirror/
To utilize the --prefer-offline feature, setting up an offline package repository is a prerequisite.
Begin by establishing a cache in a hidden directory within the home folder:
yarn config set yarn-offline-mirror ./.npm-offline
Additionally, configure Yarn to clean downloaded tarballs:
yarn config set yarn-offline-mirror-pruning true
Subsequently, running yarn install in a project will store modules in this directory for future retrieval using yarn --prefer-offline.
When accessing the cached modules in a different project, specify the desired module version since there is no concept of 'latest'. An easy approach is to attempt adding:
yarn add moment
This command may display:
error Couldn't find any versions for "moment" that matches "latest" in our cache.
Possible versions: "2.1.0, 2.13.0, 2.17.0, 2.17.1, 2.18.1, 2.19.1, 2.19.2, 2.19.3, 2.8.4"
// Note that above is not in semver order...
To install the latest version offline, use:
yarn add <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="117c7e7c747f6551233f20283f22">[email protected]</a>
The referenced Yarn blog post mentioned by @adrian provides detailed guidance on setting up a per-project cache and sharing it with your team if needed. Personally, I prefer using a single cache to easily create new projects while offline.
A well-known individual over on this platform remarked:
"Embrace the Source, awaken your inner Jedi!"
Now take a peek at the original code behind NPM's use of the --save-dev flag:
commander.option('--save-dev', 'install packages for development purposes only');
Dive in and explore!
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