intelephense

Index: package/lib/lib.es2018.asynciterable.d.ts
===================================================================
--- package/lib/lib.es2018.asynciterable.d.ts
+++ package/lib/lib.es2018.asynciterable.d.ts
@@ -26,18 +26,28 @@
      */
     readonly asyncIterator: unique symbol;
 }
 
-interface AsyncIterator<T, TReturn = any, TNext = undefined> {
+interface AsyncIterator<T, TReturn = any, TNext = any> {
     // NOTE: 'next' is defined using a tuple to ensure we report the correct assignability errors in all places.
-    next(...args: [] | [TNext]): Promise<IteratorResult<T, TReturn>>;
+    next(...[value]: [] | [TNext]): Promise<IteratorResult<T, TReturn>>;
     return?(value?: TReturn | PromiseLike<TReturn>): Promise<IteratorResult<T, TReturn>>;
     throw?(e?: any): Promise<IteratorResult<T, TReturn>>;
 }
 
-interface AsyncIterable<T> {
-    [Symbol.asyncIterator](): AsyncIterator<T>;
+interface AsyncIterable<T, TReturn = any, TNext = any> {
+    [Symbol.asyncIterator](): AsyncIterator<T, TReturn, TNext>;
 }
 
-interface AsyncIterableIterator<T> extends AsyncIterator<T> {
-    [Symbol.asyncIterator](): AsyncIterableIterator<T>;
+/**
+ * Describes a user-defined {@link AsyncIterator} that is also async iterable.
+ */
+interface AsyncIterableIterator<T, TReturn = any, TNext = any> extends AsyncIterator<T, TReturn, TNext> {
+    [Symbol.asyncIterator](): AsyncIterableIterator<T, TReturn, TNext>;
 }
+
+/**
+ * Describes an {@link AsyncIterator} produced by the runtime that inherits from the intrinsic `AsyncIterator.prototype`.
+ */
+interface AsyncIteratorObject<T, TReturn = unknown, TNext = unknown> extends AsyncIterator<T, TReturn, TNext> {
+    [Symbol.asyncIterator](): AsyncIteratorObject<T, TReturn, TNext>;
+}