chore: add @types/node dependency

Removes some compilation issues during development.

Author: JackCuthbert

package.json

@@ -30,6 +30,7 @@
     "@types/fs-extra": "5.0.5",
     "@types/jest": "24.0.12",
     "@types/lodash": "4.14.123",
+    "@types/node": "^12.6.2",
     "jest": "24.5.0",
     "mock-fs": "4.9.0",
     "rimraf": "^2.6.3",

yarn.lock

@@ -375,6 +375,11 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-11.12.2.tgz#d7f302e74b10e9801d52852137f652d9ee235da8"
   integrity sha512-c82MtnqWB/CqqK7/zit74Ob8H1dBdV7bK+BcErwtXbe0+nUGkgzq5NTDmRW/pAv2lFtmeNmW95b0zK2hxpeklg==
 
+"@types/node@^12.6.2":
+  version "12.6.2"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.6.2.tgz#a5ccec6abb6060d5f20d256fb03ed743e9774999"
+  integrity sha512-gojym4tX0FWeV2gsW4Xmzo5wxGjXGm550oVUII7f7G5o4BV6c7DBdiG1RRQd+y1bvqRyYtPfMK85UM95vsapqQ==
+
 "@types/stack-utils@^1.0.1":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-1.0.1.tgz#0a851d3bd96498fa25c33ab7278ed3bd65f06c3e"