[core-paging] Update the return type for "next" method in PagedAsyncIterableIterator

sdk/core/core-paging/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## 1.1.2 (Unreleased)
 
+- Provided down-leveled type declaration files to support older TypeScript versions 3.1 to 3.6.
+  [PR 10599](https://github.com/Azure/azure-sdk-for-js/pull/10599)
 
 ## 1.1.1 (2020-04-02)
 

sdk/core/core-paging/package.json

@@ -17,9 +17,17 @@
     "clientruntime"
   ],
   "main": "./dist-esm/index.js",
-  "types": "./types/corePaging.d.ts",
+  "types": "./types/latest/corePaging.d.ts",
+  "typesVersions": {
+    "<3.6": {
+      "types/latest/*": [
+        "types/3.1/*"
+      ]
+    }
+  },
   "files": [
-    "types/*.d.ts",
+    "types/latest/corePaging.d.ts",
+    "types/3.1",
     "dist-esm/**/*.js",
     "LICENSE",
     "README.md"

sdk/core/core-paging/types/3.1/corePaging.d.ts

@@ -0,0 +1,33 @@
+import "@azure/core-asynciterator-polyfill";
+/**
+ * @interface
+ * An interface that tracks the settings for paged iteration
+ */
+export interface PageSettings {
+    /**
+     * @member {string} [continuationToken] The token that keeps track of where to continue the iterator
+     */
+    continuationToken?: string;
+    /**
+     * @member {number} [pageSize] The size of the page during paged iteration
+     */
+    maxPageSize?: number;
+}
+/**
+ * @interface
+ * An interface that allows async iterable iteration both to completion and by page.
+ */
+export interface PagedAsyncIterableIterator<T, PageT = T[], PageSettingsT = PageSettings> {
+    /**
+     * @member {Promise} [next] The next method, part of the iteration protocol
+     */
+    next(): Promise<IteratorResult<T>>;
+    /**
+     * @member {Symbol} [asyncIterator] The connection to the async iterator, part of the iteration protocol
+     */
+    [Symbol.asyncIterator](): PagedAsyncIterableIterator<T, PageT, PageSettingsT>;
+    /**
+     * @member {Function} [byPage] Return an AsyncIterableIterator that works a page at a time
+     */
+    byPage: (settings?: PageSettingsT) => AsyncIterableIterator<PageT>;
+}

sdk/core/core-paging/types/corePaging.d.ts → sdk/core/core-paging/types/latest/corePaging.d.ts

@@ -21,10 +21,7 @@ export interface PagedAsyncIterableIterator<T, PageT = T[], PageSettingsT = Page
   /**
    * @member {Promise} [next] The next method, part of the iteration protocol
    */
-  next(): Promise<{
-    done?: boolean;
-    value: T;
-  }>;
+  next(): Promise<IteratorResult<T, T>>;
   /**
    * @member {Symbol} [asyncIterator] The connection to the async iterator, part of the iteration protocol
    */