wip: migrate to bun

src/meanBy.ts

@@ -0,0 +1,28 @@
+import baseSum from './.internal/baseSum.js';
+
+/** Used as references for various `Number` constants. */
+const NAN = 0 / 0;
+
+/**
+ * This method is like `mean` except that it accepts `iteratee` which is
+ * invoked for each element in `array` to generate the value to be averaged.
+ * The iteratee is invoked with one argument: (value).
+ *
+ * @since 4.7.0
+ * @category Math
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The iteratee invoked per element.
+ * @returns {number} Returns the mean.
+ * @example
+ *
+ * const objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }]
+ *
+ * meanBy(objects, ({ n }) => n)
+ * // => 5
+ */
+function meanBy(array, iteratee) {
+    const length = array == null ? 0 : array.length;
+    return length ? baseSum(array, iteratee) / length : NAN;
+}
+
+export default meanBy;