Fix typing of addOperator Methods

These methods currently return void so don't mark their return type as map

Author: chris-pardy

types/index.d.ts

@@ -35,11 +35,11 @@ export class Engine {
   setCondition(name: string, conditions: TopLevelCondition): this;
   removeCondition(name: string): boolean;
 
-  addOperator(operator: Operator): Map<string, Operator>;
+  addOperator(operator: Operator): void;
   addOperator<A, B>(
     operatorName: string,
     callback: OperatorEvaluator<A, B>
-  ): Map<string, Operator>;
+  ): void;
   removeOperator(operator: Operator | string): boolean;
 
   addFact<T>(fact: Fact<T>): this;

types/index.test-d.ts

@@ -72,15 +72,15 @@ const operatorEvaluator: OperatorEvaluator<number, number> = (
   a: number,
   b: number
 ) => a === b;
-expectType<Map<string, Operator>>(
+expectType<void>(
   engine.addOperator("test", operatorEvaluator)
 );
 const operator: Operator = new Operator(
   "test",
   operatorEvaluator,
   (num: number) => num > 0
 );
-expectType<Map<string, Operator>>(engine.addOperator(operator));
+expectType<void>(engine.addOperator(operator));
 expectType<boolean>(engine.removeOperator(operator));
 
 // Fact tests