[jquery] Fix PromiseLike compatibility for Promise3, Promise2, and jqXHR.

types/jquery/index.d.ts

@@ -6674,6 +6674,9 @@ declare namespace JQuery {
              progressFilter?: null): Promise3<ARD, AJD, AND,
             BRD, BJD, BND,
             CRD, CJD, CND>;
+        // PromiseLike compatibility
+        then<TResult1 = TR, TResult2 = never>(onfulfilled?: ((value: TR) => TResult1 | PromiseLike<TResult1>) | undefined | null,
+                                              onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): PromiseLike<TResult1 | TResult2>;
 
         /**
          * Add handlers to be called when the Deferred object is rejected.

types/jquery/jquery-tests.ts

@@ -7138,6 +7138,13 @@ function Promise3() {
             return $.ajax('/echo/json');
         });
     }
+
+    // As argument to PromiseLike parameter
+    {
+        Promise.resolve(p).then(a => {
+            a; // $ExpectType string
+        });
+    }
 }
 
 function Promise2(p: JQuery.Promise2<string, Error, number, JQuery, string, boolean>) {