I am curious about the way Javascript's npm handles dependencies in terms of installation. Does it install dependencies on an OS-wide level similar to how Python's pip operates without a virtualenv? Or does npm handle installations more like Java's mvn, which store dependencies in a local pom.xml file (making it feel like always being in a virtualenv compared to pip)?
My main question revolves around whether npm performs OS-wide installs or local installs.
Why not both?
yarn add PACKAGE_NAME installs the package globally.
yarn add --dev PACKAGE_NAME installs the package as a development dependency in the current directory, under node_modules/.
yarn add PACKAGE_NAME --save installs the package locally and saves it as a dependency in your package.json.
Take a look at this guide for more information.
By simply running
npm install <dependency name>If you use the command
npm install -g <dependency name>-g flag, you are indicating that you want the dependency to be installed globally, and it will be saved in the global node_modules directory. Global dependencies can often be accessed via the command line interface (CLI).
For example,
$ npm install mocha
You can run this command in the current directory where the installation is taking place or where the node_module exists.
$ $PWD/node_modules/.bin/mocha -v
Alternatively,
$ npm install -g mocha
You can then execute the command from anywhere in your directory using the terminal.
$ mocha -v
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