Add typescript test for pathresolver

Author: Cache Hamm

types/index.test-d.ts

@@ -7,6 +7,7 @@ import rulesEngine, {
   Fact,
   Operator,
   OperatorEvaluator,
+  PathResolver,
   Rule,
   RuleProperties,
   RuleSerializable
@@ -44,6 +45,10 @@ const complexRuleProps: RuleProperties = {
   }
 };
 
+// path resolver
+const pathResolver = function(value: object, path: string): any {}
+expectType<PathResolver>(pathResolver)
+
 // default export test
 expectType<Engine>(rulesEngine([ruleProps]));
 const engine = rulesEngine([complexRuleProps]);