I have downloaded latest version of nodejs for windows.
When I run command
npm WARN optional Skipping failed optional dependency
npm WARN notsup Not compatible with your operating system or
npm WARN firstname.lastname@example.org No repository field.
These are warnings, not errors, so everything still should run fine.
fsevents is an optional dependency, and because it is not supported by your operating system, it is skipped.
The other warning is related to you not having a repository field in your
package.json file, so just something to tell you to fix, but not mandatory.
Everything should work fine!