Is there a virtual environment for node.js?

nodeenv - virtual environment for node.js ( Analog virtualenv )

There are also some Node version management systems that can help.

Check out Nave https://github.com/isaacs/nave

NVM could also be used https://github.com/creationix/nvm

There is also one called n https://github.com/visionmedia/n

You can use miniconda, as explained here.

This allows you to combine python & nodejs in a single conda environment to do all your development work isolated from the global system:

conda create --name my_env python=3.9 nodejs conda activate my_env # optionally, also install yarn conda install -c conda-forge yarn ############################################## # check it works # python related pip --version python --version # nodejs related yarn --version npm --version node --version ############################################## # verify they're inside the conda environment # python related which pip which python # nodejs related which yarn which npm which node 

You don't always need to install dependencies globally. Usually it's recommended because then you can use the commands an npm package provides. But if you install it locally (in the node_modules) directory, you can also use these commands, they only wind up in the node_modules/.bin/ directory, so you'll have to type node_modules/.bin/<command>, which is annoying, but you can of course add this path to your PATH environment variable:

export PATH=node_modules/.bin:$PATH 

Then you can just type <command> and it works!

There's actually an npm command that returns an absolute path to the .bin directory:

$ npm bin /path/to/node_modules/.bin 

This command also works when you're in a subdirectory of the project, it will return the first node_modules/.bin directory it finds in it's parent directories.

You can add this alias in your .bashrc to automatically add the .bin/ directory to your PATH:

alias nodebin='export PATH=$(npm bin):$PATH' 

So when you're in a directory of a project that has a node_modules/ directory in the root, you can type nodebin and then you can use all the commands that are in the .bin/ directory!

Update:

Nowadays, you have a package that takes care of all of this for you: npx. Then you just prefix your command with npx, like: npx <command>. Check it out:

https://docs.npmjs.com/cli/v7/commands/npx

bxjx's answer is conceptually accurate. However, please note that the bundle command no longer takes a directory. It always drops packages into the node_modules folder, so that npm knows where to find them later (and can avoid double-installing dependencies).

Any solution will probably involve installing npm and nave "system-wide" (that is, in your PATH, which could be in ~ somewhere), but then only installing your specific dependencies in the virtual environment.

I responded more thoroughly on the github issue.

tl;dr: The use case is valid and helpful, and while it's mostly there, it's not as well served as it could be. We should make sure to think it through and do it right.

Update much later: if you want something a lot more like virtualEnv, check out Nave: https://github.com/isaacs/nave

looks there is a better way:

Installing Node.js and npm into a Python Virtualenv

now I can use node tools without mess the global bin environment

If you like it simple, I truely recommend visionmedia's n, could not be easier!

https://github.com/visionmedia/n

Please check node-venv package. https://www.npmjs.com/package/node-venv.

Node-Venv provides two main commands to help you manage your Node.js environment: set and activate.

1. Setting Node.js Version

node-venv set <semantic_version> 

Replace <semantic_version> with the specific version you need, such as "14.17.6" or "16.9.0."

2. Activating Node-Venv

To activate Node-Venv, run the following command:

node-venv activate 

For a Node virtual environment, Node doesn't need to do as virtualenv of Python, because package are already installed inside the project directory, if you want to use a target version of node, there is nvm and nvm-windows.

Also, if you want to do as virtualenv, you can make a script that create a folder, and set VIRTUAL_ENV and PATH environment variable.

const VIRTUAL_ENV = path.resolve('./venv/') if (!fs.existsSync(VIRTUAL_ENV)){ fs.mkdirSync(VIRTUAL_ENV); fs.mkdirSync(path.resolve(VIRTUAL_ENV, 'Scripts')); } process.env['VIRTUAL_ENV'] = VIRTUAL_ENV process.env['PATH'] = path.resolve(VIRTUAL_ENV, 'Scripts') + ';' + process.env['PATH'] // const python = spawn('python', ['main.py']) will run in venv environment.