What does this NPM warning about updating mean and how is it even possible?

Why does the design allow this?npm WARN update-linked node_modules/mongodb needs updating to 2.2.22 from 2.2.22 but we can't, as it's a symlink application-name@0.0.1 /var/www/gamecollection └── monk@3.1.4npm WARN optional Skipping failed optional dependency /chokidar/fsevents: npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.1.1

Submitted March 17, 2017 at 05:22PM by mineralwatersoda