Sorry, I'm not sure that I comprehend your question correctly. Are you asking me how versions of a lib are managed in the package.json of a project?

All of those are valid:

{ "dependencies" :

  { 

  "foo" : "1.0.0 - 2.9999.9999",

  "bar" : ">=1.0.2 <2.1.2",

  "baz" : ">1.0.2 <=2.3.4",

  "boo" : "2.0.1",

  "qux" : "<1.0.0 || >=2.3.1 <2.4.5 || >=2.5.2 <3.0.0",

  "til" : "~1.2",

  "elf" : "~1.2.3",

  "two" : "2.x",

  "thr" : "3.3.x",

  "lat" : "latest"

  }

}