define(['exports', 'module'], function (exports, module) {
  'use strict';

  module.exports = function (instance) {
    instance.registerHelper('lookup', function (obj, field) {
      if (!obj) {
        return obj;
      }
      if (field === 'constructor' && !obj.propertyIsEnumerable(field)) {
        return undefined;
      }
      return obj[field];
    });
  };
});
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