On the latest NodeJS release, v.4 I have this issue when trying to install salita:
npm ERR! Darwin 14.5.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "salita" "-g"
npm ERR! node v4.0.0
npm ERR! npm v2.14.2
npm ERR! code ETARGET
npm ERR! notarget No compatible version found: npm@'v3.x-next'
npm ERR! notarget Valid install targets:
npm ERR! notarget ["1.1.25","1.2.32","1.3.2","1.3.4","1.2.20","1.2.21","1.2.22","1.2.23","1.2.24","1.2.25","1.2.27","1.2.28","1.2.30","1.2.31","1.3.0","1.3.1","1.2.19","1.1.70","1.1.71","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.3.10","1.3.11","1.3.12","1.3.13","1.3.14","1.3.15","1.3.16","1.3.17","1.3.18","1.3.20","1.3.21","1.3.22","1.3.23","1.3.24","1.3.25","1.3.26","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8","1.4.9","1.4.10","1.4.11","1.4.12","1.4.13","1.4.14","1.4.15","1.4.16","1.2.8000","1.4.17","1.4.18","1.4.19","1.5.0-alpha-0","1.5.0-alpha-1","1.4.20","1.5.0-alpha-2","1.4.21","1.5.0-alpha-3","1.5.0-alpha-4","2.0.0-alpha-5","1.4.22","1.4.23","2.0.0-alpha.6.0","1.4.24","2.0.0-alpha.6","2.0.0-alpha.7","2.0.0-beta.0","1.4.25","2.0.0-beta.1","1.4.26","2.0.0-beta.2","1.4.27","2.0.0-beta.3","1.4.28","2.0.0","2.0.1","2.0.2","2.1.0","2.1.1","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9","2.1.10","2.1.11","2.1.12","2.1.13","2.1.14","2.1.15","2.1.16","2.1.17","2.1.18","2.2.0","2.3.0","2.4.0","2.4.1","2.5.0","2.5.1","2.6.0","2.6.1","2.7.0","2.7.1","2.7.2","2.7.3","2.7.4","2.7.5","2.7.6","2.8.0","2.8.1","2.8.2","2.8.3","2.8.4","2.9.0","2.9.1","2.10.0","2.10.1","2.11.0","2.11.1","2.11.2","2.11.3","2.12.0","3.0.0","2.12.1","2.13.0","3.1.0","2.13.1","3.1.1","3.1.2","2.13.2","3.1.3","2.13.3","3.2.0","2.13.4","3.2.1","2.13.5","3.2.2","2.14.0","3.3.0","2.14.1","2.14.2","3.3.1","2.14.3","3.3.2","2.14.4","3.3.3","2.14.5","3.3.4"]
npm ERR! notarget
npm ERR! notarget This is most likely not a problem with npm itself.
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.
npm ERR! notarget
npm ERR! notarget It was specified as a dependency of 'salita'
npm ERR! notarget