npm: install and use different versions of a package

user_4602605 0
Viewed 1579

Is there a way to install and also use the different package versions in npm? Installations works:

npm install -g packagename@2.8
npm install -g packagename@3.1
npm install -g packagename@4.0

I can install npm install -g web3@0.20.7 and check npm view web3 versions them. But how can I use them in the *.js script? Something like this:

require('packagename@2.8');
require('packagename@3.1');
require('packagename@4.0');
npm node.js installation javascript
2 Answers

There is a node module that allows you to do it.

npm-install-version

Install it: npm install npm-install-version --save-dev

var niv = require('npm-install-version');

niv.install('packagenameolder@1.0.0');
niv.install('packagenamenewer@1.0.1');

var package_old = niv.require('packagenameolder@1.0.0');
var package_new = niv.require('packagenamenewer@1.0.1');
user_61081710

I did some research and it seems that its not possible with standard NPM. Here is the feature-request: https://github.com/npm/npm/issues/5499

However, with yarn (an NPM alternative from Facebook), you can do it out of the box by using yarn add and giving the package an alias.

I have not tried this for globally installed packages though, I assume it works the same.

user_7173410
Related