12   var errors = []  variable
15     errors.push('name cannot be null')
16     return done(warnings, errors)
20     errors.push('name cannot be undefined')
21     return done(warnings, errors)
25     errors.push('name must be a string')
26     return done(warnings, errors)
30     errors.push('name length must be greater than zero')
34     errors.push('name cannot start with a period')
38     errors.push('name cannot start with an underscore')
42     errors.push('name cannot contain leading or trailing spaces')
48       errors.push(blacklistedName + ' is a blacklisted name')
83         return done(warnings, errors)
87     errors.push('name can only contain URL-friendly characters')
90   return done(warnings, errors)
95 var done = function (warnings, errors) {  argument
97     validForNewPackages: errors.length === 0 && warnings.length === 0,
98     validForOldPackages: errors.length === 0,
100     errors: errors  property
103   if (!result.errors.length) delete result.errors