text: const ValueGenerator = function(input) {
      if(typeof input === 'object' && input.property !== undefined)    // Value name comes from a property in each item
          return (f => f.properties[input.property]);
      else if(typeof input === 'object' && input.generator !== undefined)   // Value name generated by a function run on each item
          return input.generator;
      else return (() => input);
  
      return undefined;
  }
  
  module.exports = exports = ValueGenerator;
  