Support the exported value of a stack being a Promise/Output itself (#2916)

CHANGELOG.md

@@ -8,9 +8,10 @@ CHANGELOG
   [#2784](https://github.com/pulumi/pulumi/issues/2784))
 - Fix an issue where output values of a resource would not be present when they
   contained secret values, when using Python.
-
 - Fix an issue where emojis are printed in non-interactive mode. (fixes
   [#2871](https://github.com/pulumi/pulumi/issues/2871))
+- Promises/Outputs can now be directly exported as the top-level (i.e. not-named) output of a Stack.
+  (fixes [#2910](https://github.com/pulumi/pulumi/issues/2910))
 
 ## 0.17.21 (2019-06-26)
 

sdk/nodejs/runtime/stack.ts

@@ -74,21 +74,13 @@ class Stack extends ComponentResource {
             // helps ensure that outputs can point to resources, and that that is stored and
             // presented as something reasonable, and not as just an id/urn in the case of
             // Resources.
-            super.registerOutputs(outputs === undefined ? undefined : massageOutputs(outputs));
+            super.registerOutputs(massage(outputs, new Set()));
         }
 
         return outputs;
     }
 }
 
-function massageOutputs(outputs: Inputs): Inputs {
-    const result: Inputs = {};
-    for (const k of Object.keys(outputs)) {
-       result[k] = output(outputs[k]).apply(v => massage(v, new Set()));
-    }
-    return result;
-}
-
 async function massage(prop: any, seenObjects: Set<any>): Promise<any> {
     if (prop === undefined ||
         prop === null ||