Merge pull request #14196 from nycdotnet/master

Revise Node.js definition to respond to feedback on PR #13877

node/index.d.ts

@@ -4016,10 +4016,8 @@ declare module "v8" {
         physical_space_size: number;
     }
 
-    enum DoesZapCodeSpaceFlag {
-        Disabled = 0,
-        Enabled = 1
-    }
+    //** Signifies if the --zap_code_space option is enabled or not.  1 == enabled, 0 == disabled. */
+    type DoesZapCodeSpaceFlag = 0 | 1;
 
     interface HeapInfo {
         total_heap_size: number;

node/node-tests.ts

@@ -24,6 +24,7 @@ import * as string_decoder from "string_decoder";
 import * as stream from "stream";
 import * as timers from "timers";
 import * as repl from "repl";
+import * as v8 from "v8";
 
 // Specifically test buffer module regression.
 import {Buffer as ImportedBuffer, SlowBuffer as ImportedSlowBuffer} from "buffer";
@@ -2071,6 +2072,21 @@ namespace constants_tests {
     str = constants.defaultCipherList
 }
 
+
+////////////////////////////////////////////////////
+/// v8 tests : https://nodejs.org/api/v8.html
+////////////////////////////////////////////////////
+
+namespace v8_tests {
+
+    const heapStats = v8.getHeapStatistics();
+    const heapSpaceStats = v8.getHeapSpaceStatistics();
+    
+    const zapsGarbage: number = heapStats.does_zap_garbage;
+
+    v8.setFlagsFromString('--collect_maps');
+}
+
 ///////////////////////////////////////////////////////////
 /// Debugger Tests                                      ///
 ///////////////////////////////////////////////////////////