Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/@sinonjs/commons/lib/order-by-first-call.js

@@ -0,0 +1,36 @@
+"use strict";
+
+var sort = require("./prototypes/array").sort;
+var slice = require("./prototypes/array").slice;
+
+/**
+ * @private
+ */
+function comparator(a, b) {
+    // uuid, won't ever be equal
+    var aCall = a.getCall(0);
+    var bCall = b.getCall(0);
+    var aId = (aCall && aCall.callId) || -1;
+    var bId = (bCall && bCall.callId) || -1;
+
+    return aId < bId ? -1 : 1;
+}
+
+/**
+ * A Sinon proxy object (fake, spy, stub)
+ *
+ * @typedef {object} SinonProxy
+ * @property {Function} getCall - A method that can return the first call
+ */
+
+/**
+ * Sorts an array of SinonProxy instances (fake, spy, stub) by their first call
+ *
+ * @param  {SinonProxy[] | SinonProxy} spies
+ * @returns {SinonProxy[]}
+ */
+function orderByFirstCall(spies) {
+    return sort(slice(spies), comparator);
+}
+
+module.exports = orderByFirstCall;