How does NPM handle version conflicts?

Question

Since NPM modules are version 3 node and dependencies are installed at the same root level. But what if I install two modules that depend on two different versions of the same module? For example, if I install async npm i async@2.1.4 , which requires lodash version 4.14.0 , then I install yoman npm i yo@1.8.5 , which requires lodash version 3.2.0 , how does npm resolve this conflict?

Answer 1

Npm has a doc page

https://docs.npmjs.com/how-npm-works/npm3
http://npm.imtqy.com/how-npm-works-docs/npm3/how-npm3-works.html