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define([], function() {
  /**   * Checks if a `cache` value for `key` exists.   *   * @private   * @param {Object} cache The cache to query.   * @param {string} key The key of the entry to check.   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.   */  function cacheHas(cache, key) {    return cache.has(key);  }
  return cacheHas;});