Add '__spreadArrays' helper (#67)

tslib.d.ts

@@ -23,7 +23,8 @@ export declare function __generator(thisArg: any, body: Function): any;
 export declare function __exportStar(m: any, exports: any): void;
 export declare function __values(o: any): any;
 export declare function __read(o: any, n?: number): any[];
-export declare function __spread(...args: any[]): any[];
+export declare function __spread(...args: any[][]): any[];
+export declare function __spreadArrays(...args: any[][]): any[];
 export declare function __await(v: any): any;
 export declare function __asyncGenerator(thisArg: any, _arguments: any, generator: Function): any;
 export declare function __asyncDelegator(o: any): any;

tslib.es6.js

@@ -140,6 +140,14 @@ export function __spread() {
     return ar;
 }
 
+export function __spreadArrays() {
+    for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
+    for (var r = Array(s), k = 0, i = 0; i < il; i++)
+        for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
+            r[k] = a[j];
+    return r;
+};
+
 export function __await(v) {
     return this instanceof __await ? (this.v = v, this) : new __await(v);
 }

tslib.js

@@ -25,6 +25,7 @@ var __exportStar;
 var __values;
 var __read;
 var __spread;
+var __spreadArrays;
 var __await;
 var __asyncGenerator;
 var __asyncDelegator;
@@ -176,6 +177,14 @@ var __importDefault;
         return ar;
     };
 
+    __spreadArrays = function () {
+        for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
+        for (var r = Array(s), k = 0, i = 0; i < il; i++)
+            for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
+                r[k] = a[j];
+        return r;
+    };
+
     __await = function (v) {
         return this instanceof __await ? (this.v = v, this) : new __await(v);
     };
@@ -235,6 +244,7 @@ var __importDefault;
     exporter("__values", __values);
     exporter("__read", __read);
     exporter("__spread", __spread);
+    exporter("__spreadArrays", __spreadArrays);
     exporter("__await", __await);
     exporter("__asyncGenerator", __asyncGenerator);
     exporter("__asyncDelegator", __asyncDelegator);