Strict null check mainThreadHeapService

package.json

@@ -28,7 +28,7 @@
   },
   "dependencies": {
     "applicationinsights": "1.0.8",
-    "gc-signals": "^0.0.1",
+    "gc-signals": "^0.0.2",
     "getmac": "1.4.1",
     "graceful-fs": "4.1.11",
     "http-proxy-agent": "^2.1.0",
@@ -150,4 +150,4 @@
     "windows-mutex": "0.2.1",
     "windows-process-tree": "0.2.3"
   }
-}
+}
\ No newline at end of file

src/tsconfig.strictNullChecks.json

@@ -56,6 +56,7 @@
 		"./vs/workbench/api/electron-browser/mainThreadErrors.ts",
 		"./vs/workbench/api/electron-browser/mainThreadFileSystem.ts",
 		"./vs/workbench/api/electron-browser/mainThreadFileSystemEventService.ts",
+		"./vs/workbench/api/electron-browser/mainThreadHeapService.ts",
 		"./vs/workbench/api/electron-browser/mainThreadLanguages.ts",
 		"./vs/workbench/api/electron-browser/mainThreadLogService.ts",
 		"./vs/workbench/api/electron-browser/mainThreadMessageService.ts",

yarn.lock

@@ -3482,10 +3482,10 @@ gauge@~2.7.3:
     strip-ansi "^3.0.1"
     wide-align "^1.1.0"
 
-gc-signals@^0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/gc-signals/-/gc-signals-0.0.1.tgz#91e3b7904168b58aa3dc78b619b7b4495b4038ab"
-  integrity sha1-keO3kEFotYqj3Hi2Gbe0SVtAOKs=
+gc-signals@^0.0.2:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/gc-signals/-/gc-signals-0.0.2.tgz#1cfa8a00adecaeeb93ea0dda72dad9e9f333e62f"
+  integrity sha512-Ghj4Co6x5bd3dvbAFuiDc6gN+BVK8ic8CBn70dXjzrtbC5hq4a+s4S6acEvftMP7LcQuHKN5v+30PGXhkCLoCQ==
 
 generate-function@^2.0.0:
   version "2.0.0"