Initial import with skill sheet working

node_modules/eslint/lib/shared/serialization.js

@@ -0,0 +1,55 @@
+/**
+ * @fileoverview Serialization utils.
+ * @author Bryan Mishkin
+ */
+
+"use strict";
+
+/**
+ * Check if a value is a primitive or plain object created by the Object constructor.
+ * @param {any} val the value to check
+ * @returns {boolean} true if so
+ * @private
+ */
+function isSerializablePrimitiveOrPlainObject(val) {
+    return (
+        val === null ||
+        typeof val === "string" ||
+         typeof val === "boolean" ||
+         typeof val === "number" ||
+         (typeof val === "object" && val.constructor === Object) ||
+         Array.isArray(val)
+    );
+}
+
+/**
+ * Check if a value is serializable.
+ * Functions or objects like RegExp cannot be serialized by JSON.stringify().
+ * Inspired by: https://stackoverflow.com/questions/30579940/reliable-way-to-check-if-objects-is-serializable-in-javascript
+ * @param {any} val the value
+ * @returns {boolean} true if the value is serializable
+ */
+function isSerializable(val) {
+    if (!isSerializablePrimitiveOrPlainObject(val)) {
+        return false;
+    }
+    if (typeof val === "object") {
+        for (const property in val) {
+            if (Object.hasOwn(val, property)) {
+                if (!isSerializablePrimitiveOrPlainObject(val[property])) {
+                    return false;
+                }
+                if (typeof val[property] === "object") {
+                    if (!isSerializable(val[property])) {
+                        return false;
+                    }
+                }
+            }
+        }
+    }
+    return true;
+}
+
+module.exports = {
+    isSerializable
+};