peer dependency issue

[HADDADENICAR]

after running

npm install 

i get this warning :

npm WARN leaflet.markercluster@1.3.0 requires a peer of leaflet@~1.0.3 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

up to date in 41.436s

what is wrong