tech: removing unused variables from typescript files, and making tslint rules more strict

tslint.json

@@ -1,5 +1,8 @@
 {
   "rules": {
+    "no-unused-expression": true,
+    "no-duplicate-variable": true,
+		"no-unused-variable": true,
     "class-name": true,
     "comment-format": [false, "check-space"],
     "curly": true,
@@ -28,7 +31,6 @@
     "no-string-literal": false,
     "no-switch-case-fall-through": false,
     "no-trailing-whitespace": true,
-    "no-unused-expression": false,
     "no-use-before-declare": true,
     "no-var-keyword": false,
     "object-literal-sort-keys": false,