more beauty way to create array with original keys

package.json

@@ -34,7 +34,7 @@
     "reflect-metadata": "^0.1.9",
     "source-map-support": "0.4.8",
     "string-template": "^1.0.0",
-    "tslib": "^1.4.0"
+    "tslib": "^1.5.0"
   },
   "devDependencies": {
     "@types/chai": "3.4.34",
@@ -47,7 +47,7 @@
     "@types/lodash": "^4.14.45",
     "@types/mkdirp": "0.3.29",
     "@types/mocha": "2.2.35",
-    "@types/node": "6.0.56",
+    "@types/node": "6.0.57",
     "@types/sinon": "1.16.34",
     "@types/string-template": "1.0.2",
     "awesome-typescript-loader": "3.0.0-beta.17",

src/node-transformers/node-control-flow-transformers/control-flow-replacers/BlockStatementControlFlowReplacer.ts

@@ -57,7 +57,7 @@ export class BlockStatementControlFlowReplacer extends AbstractControlFlowReplac
         }
 
         const blockStatementBody: ESTree.Statement[] = blockStatementNode.body;
-        const originalKeys: number[] = Object.keys(blockStatementBody).map((key: string) => parseInt(key, 10));
+        const originalKeys: number[] = Array.from(Array(blockStatementBody.length).keys());
         const shuffledKeys: number[] = Utils.arrayShuffle(originalKeys);
         const originalKeysIndexesInShuffledArray: number[] = originalKeys.map((key: number) => shuffledKeys.indexOf(key));