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I'm running a couple of projects that make use of Yarn v1 that will not be upgraded to Yarn v2 anytime soon for many reasons (CI being one of them). However, I would like to use Yarn v2 for new projects.
Is there a sane way to have both Yarn v1 and Yarn v2 installed on one machine so they can be used interchangebly between projects?
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Backwards Compatibility with node_modules However, Yarn 2 now offers an option that copies packages to the node_modules/ folder just like Yarn 1, providing backward compatibility for these projects. It literally requires adding a single line to your new .
You can specify versions using one of these: yarn add package-name installs the “latest” version of the package. yarn add [email protected] installs a specific version of a package from the registry. yarn add package-name@tag installs a specific “tag” (e.g. beta , next , or latest ).
Yarn can consume the same package. json format as npm, and can install any package from the npm registry. This will lay out your node_modules folder using Yarn's resolution algorithm that is compatible with the node.
Installing all dependencies: yarn or yarn install. Installing one and only one version of a package: yarn install --flat. Forcing a re-download of all packages: yarn install --force. Installing only production dependencies: yarn install --production.
We recommend using Yarn 1 as global so as to avoid possible backward compatibility issues (for example later versions renamed some options and settings). You then have two options:
You can use yarn policies set-version berry on a per-project basis; it will install the very latest Yarn releases in the
.yarn/releases folder, which you can then add to your repository. Docs for yarn policies.
Or you can add a "packageManager": "[email protected]" field to your package.json file and run corepack enable. This will use the Corepack tool to setup your system in such a way that any yarn commands will use the exact version you configured for the active project.
This keeps the risks to a minimum and allows you to migrate when you feel ready.
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