Merge pull request #16698 from Microsoft/master-16017

[Master]  Fix 16017 - ordering of promise all method

tests/cases/compiler/correctOrderOfPromiseMethod.ts

@@ -0,0 +1,27 @@
+// @lib: dom, es7
+
+interface A {
+    id: string
+}
+
+interface B {
+    id: string
+    fieldB: string
+}
+
+async function countEverything(): Promise<number> {
+    const providerA = async (): Promise<A[]> => { return [] }
+    const providerB = async (): Promise<B[]> => { return [] }
+
+    const [resultA, resultB] = await Promise.all([
+        providerA(),
+        providerB(),
+    ]);
+
+    const dataA: A[] = resultA;
+    const dataB: B[] = resultB;
+    if (dataA && dataB) {
+        return dataA.length + dataB.length;
+    }
+    return 0;
+}