Show information about why a package is installed.
This command will identify why a package has been installed, detailing which
other packages depend upon it, for example, or whether it was explicitly marked
as a dependency in the
$ yarn why jest yarn why vx.x.x [1/4] 🤔 Why do we have the module "jest"...? [2/4] 🚚 Initialising dependency graph... [3/4] 🔍 Finding dependency... [4/4] 🚡 Calculating file sizes... info Has been hoisted to "jest" info This module exists because it's specified in "devDependencies". info Disk size without dependencies: "1.29kB" info Disk size with unique dependencies: "101.31kB" info Disk size with transitive dependencies: "20.35MB" info Amount of shared dependencies: 125
The mandatory query argument for
yarn why can be any of:
- a package name (as in the above example)
- a package folder; eg:
yarn why node_modules/once
- a file within a package folder; eg:
yarn why node_modules/once/once.js
The file locations can also be absolute.