Changes as per review

package.json

@@ -42,6 +42,9 @@
   "engines": {
     "node": ">=8.9.0"
   },
+  "tsd": {
+    "directory": "test/typescript"
+  },
   "scripts": {
     "postinstall": "echo \"Building the Benny package based on a pull request which fixes an issue with 'statusShift'... \" && (cd node_modules/benny && npm i && npm run build > /dev/null) || echo \"Building the Benny package is completed.\"",
     "generateParser": "cd src/parser; rimraf ./generated/*; java -Xmx500M -cp \"../../antlr-4.9.3-complete.jar:$CLASSPATH\" org.antlr.v4.Tool -o generated -Dlanguage=JavaScript FHIRPath.g4; grunt updateParserRequirements",

src/fhirpath.test-d.ts → test/typescript/fhirpath.test-d.ts

@@ -1,6 +1,6 @@
 // This file contains unit tests for TypeScript type declarations.
-import * as fhirpath from './fhirpath';
-import * as model from '../fhir-context/r4'
+import * as fhirpath from '../../src/fhirpath';
+import * as model from '../../fhir-context/r4'
 import {expectType} from "tsd";
 
 const fhirData = {};
@@ -24,6 +24,14 @@ expectType<any[]>(
     fhirpath.compile(somePath, model, {async: false})(fhirData, envVars)
 );
 
+// If the async parameter is not passed in, the return type should be "any[]".
+expectType<any[]>(
+    fhirpath.evaluate(fhirData, somePath, envVars, model, {})
+);
+expectType<any[]>(
+    fhirpath.compile(somePath, model, {})(fhirData, envVars)
+);
+
 // If the async parameter is true, the return type should be
 // "Promise<any[]> | any[]".
 expectType<Promise<any[]> | any[]>(