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Yarn 2 AKA Berry

This lesson goes over how to install yarn 2 through npm.

To install yarn 2 globally, we use `npm install -g yarn@berry`. 

To install yarn 2 to a specific project, we use `yarn policies set-version berry`. This creates a `.yarnrc` file and a `.yarn/` directory. `.yarnrc` that sets the path to our yarn instance in the created `.yarn/` directory that holds our new yarn version.

https://app.egghead.io/api/v1/lessons/yarn-install-yarn-2/subtitles

Instructor: [00:00] Right now, I'm in an empty directory. My Yarn version is 1.21.1. If I wanted to install Yarn 2 globally, I would run npm install -g yarn@berry. I'm going to install it locally though. First, I need to yarn init -y. Y just says yes to any questions yarn init asks.

[00:24] To upgrade this local project to Yarn 2, I need to run yarn policies set-version berry. Yarn created this .yarn directory and this .yarnrc file. If I run yarn -v, it's also set my version to Yarn 2. The .yarnrc file sets the path to the yarn installation that we want to use.

Install Yarn 2

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Yarn 2 AKA Berry