lodash/_baseSetData.js

define(['./identity', './_metaMap'], function(identity, metaMap) {

  /**
   * The base implementation of `setData` without support for hot loop shorting.
   *
   * @private
   * @param {Function} func The function to associate metadata with.
   * @param {*} data The metadata.
   * @returns {Function} Returns `func`.
   */
  var baseSetData = !metaMap ? identity : function(func, data) {
    metaMap.set(func, data);
    return func;
  };

  return baseSetData;
});