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diff --git a/node_modules/fast-json-stable-stringify/index.js b/node_modules/fast-json-stable-stringify/index.js
new file mode 100644
index 0000000..c44e6a4
--- /dev/null
+++ b/node_modules/fast-json-stable-stringify/index.js
@@ -0,0 +1,59 @@
+'use strict';
+
+module.exports = function (data, opts) {
+ if (!opts) opts = {};
+ if (typeof opts === 'function') opts = { cmp: opts };
+ var cycles = (typeof opts.cycles === 'boolean') ? opts.cycles : false;
+
+ var cmp = opts.cmp && (function (f) {
+ return function (node) {
+ return function (a, b) {
+ var aobj = { key: a, value: node[a] };
+ var bobj = { key: b, value: node[b] };
+ return f(aobj, bobj);
+ };
+ };
+ })(opts.cmp);
+
+ var seen = [];
+ return (function stringify (node) {
+ if (node && node.toJSON && typeof node.toJSON === 'function') {
+ node = node.toJSON();
+ }
+
+ if (node === undefined) return;
+ if (typeof node == 'number') return isFinite(node) ? '' + node : 'null';
+ if (typeof node !== 'object') return JSON.stringify(node);
+
+ var i, out;
+ if (Array.isArray(node)) {
+ out = '[';
+ for (i = 0; i < node.length; i++) {
+ if (i) out += ',';
+ out += stringify(node[i]) || 'null';
+ }
+ return out + ']';
+ }
+
+ if (node === null) return 'null';
+
+ if (seen.indexOf(node) !== -1) {
+ if (cycles) return JSON.stringify('__cycle__');
+ throw new TypeError('Converting circular structure to JSON');
+ }
+
+ var seenIndex = seen.push(node) - 1;
+ var keys = Object.keys(node).sort(cmp && cmp(node));
+ out = '';
+ for (i = 0; i < keys.length; i++) {
+ var key = keys[i];
+ var value = stringify(node[key]);
+
+ if (!value) continue;
+ if (out) out += ',';
+ out += JSON.stringify(key) + ':' + value;
+ }
+ seen.splice(seenIndex, 1);
+ return '{' + out + '}';
+ })(data);
+};