Node.js:NPM dependency with common packages

Question:

If in node.js application we install 2 packages.both packages have a

common dependency but different versions.how npm will manage this

situation?

Answer:

if in node.js application we install 2 packages.both packages have a

common dependency but different versions.npm follows Semantic Versioning

(SEMVER) rules for version selection.If the dependency versions are

compatible according to SEMVER (i.e., satisfy the specified version range),

npm installs the version that satisfies the requirements of all packages.

If the dependency versions are incompatible according to SEMVER (i.e.,

do not satisfy the specified version range), npm attempts to resolve

the conflict by choosing a compatible version or raising a dependency

resolution error if no compatible version can be found.

In case where one version can not solve dependency tree it will install

multiple version of same package.

Question:

if in node.js application we install 2 packages.both packages have a

common dependency utill vertsion.how npm keep common dependency once

on disk?

Answer:

When you install multiple npm packages that have a common dependency up to

the same version, npm takes advantage of its dependency resolution

mechanism to ensure that the common dependency is kept once on disk.

This behavior is part of npm's approach to managing dependencies

efficiently and reducing duplication.

Shared Dependency Management:

npm maintains a centralized node_modules directory structure where all

installed packages and their dependencies are stored.If multiple packages

require the same version of a dependency, npm installs that dependency in

the node_modules directory once and creates symbolic links or references

from the respective package directories to the shared dependency.This

approach reduces disk space usage and ensures that common dependencies are

effectively shared among packages without duplication.

Question:

If in node.js application we install 1 package which has a certain

dependency ,if I want to use that package which is installed as dependency

do i need to install it seperately again ?

Answer:

If you have installed a package in your Node.js application and it has a

certain dependency, and you want to use that package installed as

dependency of another package within your application code, you typically

don't need to install that dependency separately. When you install a

package using npm, it automatically installs all its dependencies,

including any transitive dependencies (dependencies of dependencies).

But if that main package got updated & its dependency too then chances

are we have broken code that why it is better to install again that

package.