Index: node_modules/es-toolkit/dist/array/unionBy.d.mts
===================================================================
--- node_modules/es-toolkit/dist/array/unionBy.d.mts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/es-toolkit/dist/array/unionBy.d.mts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,25 @@
+/**
+ * Creates an array of unique values, in order, from all given arrays using a provided mapping function to determine equality.
+ *
+ * @template T - The type of elements in the array.
+ * @template U - The type of mapped elements.
+ * @param {T[]} arr1 - The first array.
+ * @param {T[]} arr2 - The second array.
+ * @param {(item: T) => U} mapper - The function to map array elements to comparison values.
+ * @returns {T[]} A new array containing the union of unique elements from `arr1` and `arr2`, based on the values returned by the mapping function.
+ *
+ * @example
+ * // Custom mapping function for numbers (modulo comparison)
+ * const moduloMapper = (x) => x % 3;
+ * unionBy([1, 2, 3], [4, 5, 6], moduloMapper);
+ * // Returns [1, 2, 3]
+ *
+ * @example
+ * // Custom mapping function for objects with an 'id' property
+ * const idMapper = (obj) => obj.id;
+ * unionBy([{ id: 1 }, { id: 2 }], [{ id: 2 }, { id: 3 }], idMapper);
+ * // Returns [{ id: 1 }, { id: 2 }, { id: 3 }]
+ */
+declare function unionBy<T, U>(arr1: readonly T[], arr2: readonly T[], mapper: (item: T) => U): T[];
+
+export { unionBy };