npm WARN install Couldn't install optional dependency: Unsupported

Question

I received this warning message:

npm WARN install Couldn't install optional dependency: Unsupported

when I ran the command:

$ npm i adaro --save

What does this warning mean? What is an optional dependency? Is it serious? How do I get rid of that warning?

One of dependency module's optional dependency is probably not supported on your system. Quite likely fsevents which is optional dep of chokidar. try npm install fsevents if it fails you know it is the module that failed to install. It's only for OSX so you don't need to worry about it. — Molda
– Molda, Commented Dec 26, 2015 at 19:33

gnerkus · Accepted Answer · 2016-02-08 21:05:24Z

13

The warning message is just a warning message and not an error. It does not affect the application.

It is a log message that an optional dependency could not be installed because it is not supported/needed on your current platform/cpu-arch. For example the package fsevents is often used as optional dependency but fails on any system that is not a Mac.

To show what package is throwing this message, run

$ npm install --verbose

This warning could also be triggered by packages having an engine set to something lower than what you are running. You can try

$ pm_config_engine_strict=false npm install

to get around this

answered Feb 8, 2016 at 21:05

gnerkus

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1 Comment

Christopher Martinez Over a year ago

Was this a solution? i keep thinking my project is failing because im trying to work on this project that was originally created in mac os

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