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diff --git a/node_modules/rxjs/src/internal/operators/max.ts b/node_modules/rxjs/src/internal/operators/max.ts
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+import { reduce } from './reduce';
+import { MonoTypeOperatorFunction } from '../types';
+import { isFunction } from '../util/isFunction';
+
+/**
+ * The `max` operator operates on an Observable that emits numbers (or items that
+ * can be compared with a provided function), and when source Observable completes
+ * it emits a single item: the item with the largest value.
+ *
+ * ![](max.png)
+ *
+ * ## Examples
+ *
+ * Get the maximal value of a series of numbers
+ *
+ * ```ts
+ * import { of, max } from 'rxjs';
+ *
+ * of(5, 4, 7, 2, 8)
+ *   .pipe(max())
+ *   .subscribe(x => console.log(x));
+ *
+ * // Outputs
+ * // 8
+ * ```
+ *
+ * Use a comparer function to get the maximal item
+ *
+ * ```ts
+ * import { of, max } from 'rxjs';
+ *
+ * of(
+ *   { age: 7, name: 'Foo' },
+ *   { age: 5, name: 'Bar' },
+ *   { age: 9, name: 'Beer' }
+ * ).pipe(
+ *   max((a, b) => a.age < b.age ? -1 : 1)
+ * )
+ * .subscribe(x => console.log(x.name));
+ *
+ * // Outputs
+ * // 'Beer'
+ * ```
+ *
+ * @see {@link min}
+ *
+ * @param comparer Optional comparer function that it will use instead of its
+ * default to compare the value of two items.
+ * @return A function that returns an Observable that emits item with the
+ * largest value.
+ */
+export function max<T>(comparer?: (x: T, y: T) => number): MonoTypeOperatorFunction<T> {
+  return reduce(isFunction(comparer) ? (x, y) => (comparer(x, y) > 0 ? x : y) : (x, y) => (x > y ? x : y));
+}