gistfile1.js

var constants = {
   settings: {
      setting1: "value1",
      setting2: "value2",
      setting3: "value3"
   }  
};

// check if we are in a Node enviro
if( typeof module != 'undefined') {
    module.exports = constants;
// check if we are in an Angular enviro    
} else if( typeof angular != 'undefined') {
    angular.module('myApp')
      .constant('constants',constants);
}

Feel free to suggest improvements!