Fix async generator rejection handling (#51)

tslib.es6.js

@@ -142,7 +142,7 @@ export function __asyncGenerator(thisArg, _arguments, generator) {
     return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
     function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
     function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
-    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
+    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
     function fulfill(value) { resume("next", value); }
     function reject(value) { resume("throw", value); }
     function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
@@ -151,13 +151,15 @@ export function __asyncGenerator(thisArg, _arguments, generator) {
 export function __asyncDelegator(o) {
     var i, p;
     return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-    function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
 }
 
 export function __asyncValues(o) {
     if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-    var m = o[Symbol.asyncIterator];
-    return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+    var m = o[Symbol.asyncIterator], i;
+    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
 }
 
 export function __makeTemplateObject(cooked, raw) {

tslib.js

@@ -193,13 +193,15 @@ var __importDefault;
     __asyncDelegator = function (o) {
         var i, p;
         return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
-        function verb(n, f) { if (o[n]) i[n] = function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; }; }
+        function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === "return" } : f ? f(v) : v; } : f; }
     };
 
     __asyncValues = function (o) {
         if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
-        var m = o[Symbol.asyncIterator];
-        return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
+        var m = o[Symbol.asyncIterator], i;
+        return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
+        function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
+        function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
     };
 
     __makeTemplateObject = function (cooked, raw) {