�PNG  IHDR��;���IDATx��ܻn�0���K�� �)(�pA��� ���7�LeG{�� �§㻢|��ذaÆ 6lذaÆ 6lذaÆ 6lom��$^�y���ذag�5bÆ 6lذaÆ 6lذa{���� 6lذaÆ �`����}H�Fkm�,�m����Ӫ���ô�ô!� �x�|'ܢ˟;�E:���9�&ᶒ�}�{�v]�n&�6� �h��_��t�ڠ͵-ҫ���Z;��Z$�.�P���k�ž)�!��o���>}l�eQfJ�T��u і���چ��\��X=8��Rن4`Vw�l�>����n�G�^��i�s��"ms�$�u��i��?w�bs[m�6�K4���O���.�4��%����/����b�C%��t ��M�ז� �-l�G6�mrz2���s�%�9��s@���-�k�9�=���)������k�B5����\��+͂�Zsٲ ��Rn��~G���R���C����� �wIcI��n7jJ���hۛNCS|���j0��8y�iHKֶۛ�k�Ɉ+;Sz������L/��F�*\��Ԕ�#"5��m�2��[S��������=�g��n�a�P�e�ғ�L�� lذaÆ 6l�^k��̱aÆ 6lذaÆ 6lذa;���� �_��ذaÆ 6lذaÆ 6lذaÆ ���R���IEND�B` /* MIT License http://www.opensource.org/licenses/mit-license.php Author Tobias Koppers @sokra */ "use strict"; const createHash = require("../util/createHash"); /** @typedef {import("../util/Hash")} Hash */ /** * @typedef {Object} HashableObject * @property {function(Hash): void} updateHash */ class LazyHashedEtag { /** * @param {HashableObject} obj object with updateHash method */ constructor(obj) { this._obj = obj; this._hash = undefined; } /** * @returns {string} hash of object */ toString() { if (this._hash === undefined) { const hash = createHash("md4"); this._obj.updateHash(hash); this._hash = /** @type {string} */ (hash.digest("base64")); } return this._hash; } } /** @type {WeakMap} */ const map = new WeakMap(); /** * @param {HashableObject} obj object with updateHash method * @returns {LazyHashedEtag} etag */ const getter = obj => { const hash = map.get(obj); if (hash !== undefined) return hash; const newHash = new LazyHashedEtag(obj); map.set(obj, newHash); return newHash; }; module.exports = getter;