Add node typings for require

packages/services/package.json

@@ -45,6 +45,7 @@
     "@phosphor/signaling": "^1.2.2"
   },
   "devDependencies": {
+    "@types/node": "^10.12.10",
     "@types/text-encoding": "0.0.33",
     "rimraf": "~2.6.2",
     "text-encoding": "~0.5.5",

yarn.lock

@@ -763,6 +763,10 @@
   version "8.0.58"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-8.0.58.tgz#5b3881c0be3a646874803fee3197ea7f1ed6df90"
 
+"@types/node@^10.12.10":
+  version "10.12.10"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-10.12.10.tgz#4fa76e6598b7de3f0cb6ec3abacc4f59e5b3a2ce"
+
 "@types/prop-types@*":
   version "15.5.5"
   resolved "https://registry.yarnpkg.com/@types/prop-types/-/prop-types-15.5.5.tgz#17038dd322c2325f5da650a94d5f9974943625e3"