Converted the core to ES modules

src/core/operations/legacy/UUID.js

@@ -0,0 +1,36 @@
+import crypto from "crypto";
+
+
+/**
+ * UUID operations.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ *
+ * @namespace
+ */
+const UUID = {
+
+    /**
+     * Generate UUID operation.
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    runGenerateV4: function(input, args) {
+        const buf = new Uint32Array(4).map(() => {
+            return crypto.randomBytes(4).readUInt32BE(0, true);
+        });
+        let i = 0;
+        return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function(c) {
+            let r = (buf[i >> 3] >> ((i % 8) * 4)) & 0xf,
+                v = c === "x" ? r : (r & 0x3 | 0x8);
+            i++;
+            return v.toString(16);
+        });
+    }
+};
+
+export default UUID;