Index: node_modules/es-toolkit/dist/array/countBy.mjs
===================================================================
--- node_modules/es-toolkit/dist/array/countBy.mjs	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/es-toolkit/dist/array/countBy.mjs	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,11 @@
+function countBy(arr, mapper) {
+    const result = {};
+    for (let i = 0; i < arr.length; i++) {
+        const item = arr[i];
+        const key = mapper(item, i, arr);
+        result[key] = (result[key] ?? 0) + 1;
+    }
+    return result;
+}
+
+export { countBy };