Issue during npm install

[hemanjosko]

npm WARN @angular/core@2.4.10 requires a peer of zone.js@^0.7.2 but none was installed.
npm WARN retain@1.0.0 No repository field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.2 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.2:
wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
added 937 packages in 141.404s