Initial import with skill sheet working

node_modules/@eslint/eslintrc/lib/shared/deep-merge-arrays.js

@@ -0,0 +1,58 @@
+/**
+ * @fileoverview Applies default rule options
+ * @author JoshuaKGoldberg
+ */
+
+/**
+ * Check if the variable contains an object strictly rejecting arrays
+ * @param {unknown} value an object
+ * @returns {boolean} Whether value is an object
+ */
+function isObjectNotArray(value) {
+    return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+/**
+ * Deeply merges second on top of first, creating a new {} object if needed.
+ * @param {T} first Base, default value.
+ * @param {U} second User-specified value.
+ * @returns {T | U | (T & U)} Merged equivalent of second on top of first.
+ */
+function deepMergeObjects(first, second) {
+    if (second === void 0) {
+        return first;
+    }
+
+    if (!isObjectNotArray(first) || !isObjectNotArray(second)) {
+        return second;
+    }
+
+    const result = { ...first, ...second };
+
+    for (const key of Object.keys(second)) {
+        if (Object.prototype.propertyIsEnumerable.call(first, key)) {
+            result[key] = deepMergeObjects(first[key], second[key]);
+        }
+    }
+
+    return result;
+}
+
+/**
+ * Deeply merges second on top of first, creating a new [] array if needed.
+ * @param {T[] | undefined} first Base, default values.
+ * @param {U[] | undefined} second User-specified values.
+ * @returns {(T | U | (T & U))[]} Merged equivalent of second on top of first.
+ */
+function deepMergeArrays(first, second) {
+    if (!first || !second) {
+        return second || first || [];
+    }
+
+    return [
+        ...first.map((value, i) => deepMergeObjects(value, second[i])),
+        ...second.slice(first.length)
+    ];
+}
+
+export { deepMergeArrays };