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/called-in-order.js

@@ -0,0 +1,57 @@
+"use strict";
+
+var every = require("./prototypes/array").every;
+
+/**
+ * @private
+ */
+function hasCallsLeft(callMap, spy) {
+    if (callMap[spy.id] === undefined) {
+        callMap[spy.id] = 0;
+    }
+
+    return callMap[spy.id] < spy.callCount;
+}
+
+/**
+ * @private
+ */
+function checkAdjacentCalls(callMap, spy, index, spies) {
+    var calledBeforeNext = true;
+
+    if (index !== spies.length - 1) {
+        calledBeforeNext = spy.calledBefore(spies[index + 1]);
+    }
+
+    if (hasCallsLeft(callMap, spy) && calledBeforeNext) {
+        callMap[spy.id] += 1;
+        return true;
+    }
+
+    return false;
+}
+
+/**
+ * A Sinon proxy object (fake, spy, stub)
+ *
+ * @typedef {object} SinonProxy
+ * @property {Function} calledBefore - A method that determines if this proxy was called before another one
+ * @property {string} id - Some id
+ * @property {number} callCount - Number of times this proxy has been called
+ */
+
+/**
+ * Returns true when the spies have been called in the order they were supplied in
+ *
+ * @param  {SinonProxy[] | SinonProxy} spies An array of proxies, or several proxies as arguments
+ * @returns {boolean} true when spies are called in order, false otherwise
+ */
+function calledInOrder(spies) {
+    var callMap = {};
+    // eslint-disable-next-line no-underscore-dangle
+    var _spies = arguments.length > 1 ? arguments : spies;
+
+    return every(_spies, checkAdjacentCalls.bind(null, callMap));
+}
+
+module.exports = calledInOrder;