Uninstall globally installed packages

clean.fish

# For fish shell
# it helps you win at npm
function clean -d "Clean npm global modules"
  # ~/.config/fnm 下は例外
  
end

index.js

var npm = require('npm');

npm.load({global: true}, function() {
  
  npm.commands.ls([], true, function(e, data) {
    if(e) throw e;
    
    var deps       = Object.keys(data.dependencies);
    var protecteds = ['npm'];
    
    deps = deps.filter(function(dep) {
      return !~protecteds.indexOf(dep);
    });
    
    npm.commands.uninstall(deps, function(e) {
      if (e) throw e;
    });
  });
});

package.json

{ 
  "name": "clean",
  "version": "0.0.0",
  "script": {
    "start": "sudo node index.js",
  },
  "dependencies": {
    "npm": "*"
  }
}