Javascript - Yarn

About

Yarn is a package manager

It aims to resolve two problems:

• to download the library only once by having a local repository
• to fix the code of the dependency. Library authors may have change the code without changing the version and break your code. The immutability of installed packages is handled via a yarn.lock file, which ensures that every install results in the exact same file structure in the node_modules across all machines.

Yarn command

Most yarn commands are similar to npm equivalents and it is fine to use the npm versions instead

See: https://yarnpkg.com/en/docs/usage

for instance

• Install a package into the current project

yarn add uglify-js

• Install a cli globally has been deprecated for Yarn dlx to run a one off script (to install globally use npm install -g)

## deprecated
yarn add global uglify-js

Global Package

Since Node version 16, the package manager is managed by Node and the binary is in the Node HOME.

The old directory location were:

• Linux: HOME/.config/yarn/global/
• Windows: AppData\Local\Yarn\Data\global\package.json

Configuration

• Dependencies and Dependency resolution

Support

error Package “xxx” refers to a non-existing file '“yyyy”'.

Go to the global package.json file and

• modify the path
• or delete the package from the file