Add ts types for path-resolver engine option

Author: Cache Hamm

test/engine-fact.test.js

@@ -284,13 +284,14 @@ describe('Engine: fact evaluation', () => {
 
         engine = engineFactory([], { pathResolver })
         const rule = factories.rule({ conditions, event })
-        await engine.run()
         engine.addRule(rule)
         engine.on('success', successSpy)
         engine.on('failure', failureSpy)
+
         await engine.run(fact)
+
         expect(successSpy).to.have.been.calledWith(event)
-        expect(failureSpy).to.not.have.been.calledWith(event)
+        expect(failureSpy).to.not.have.been.called()
       })
     })
   })

types/index.d.ts

@@ -1,6 +1,6 @@
 export interface EngineOptions {
-  allowUndefinedFacts: boolean;
-  pathResolver: string;
+  allowUndefinedFacts?: boolean;
+  pathResolver?: PathResolver;
 }
 
 export interface EngineResult {
@@ -94,6 +94,11 @@ export interface Event {
   params?: Record<string, any>;
 }
 
+export type PathResolver = (
+  value: object,
+  path: string,
+) => any;
+
 export type EventHandler = (
   event: Event,
   almanac: Almanac,