Fix beginGetAreaLocations (#567)

* Add null check + more clear type

* Add test

* Bump version to 12.1.1

api/VsoClient.ts

@@ -149,7 +149,7 @@ export class VsoClient {
      * @param area resource area name
      * @param locationId Guid of the location to get
      */
-    public beginGetLocation(area: string, locationId: string): Promise<ifm.ApiResourceLocation> {
+    public beginGetLocation(area: string, locationId: string): Promise<ifm.ApiResourceLocation | undefined> {
         return this._initializationPromise.then(() => {
             return this.beginGetAreaLocations(area);
         }).then((areaLocations: VssApiResourceLocationLookup) => {
@@ -162,7 +162,11 @@ export class VsoClient {
         if (!areaLocationsPromise) {
             let requestUrl = this.resolveUrl(VsoClient.APIS_RELATIVE_PATH + "/" + area);
             areaLocationsPromise = this.restClient.options<any>(requestUrl)
-                .then((res:restm.IRestResponse<any>) => {
+                .then((res: restm.IRestResponse<any>) => {
+                    if (!res.result) {
+                        return {};
+                    }
+
                     let locationsLookup: VssApiResourceLocationLookup = {};
                     let resourceLocations: ifm.ApiResourceLocation[] = res.result.value;
                     let i;
@@ -190,7 +194,7 @@ export class VsoClient {
         }
         let queryString: string = '';
 
-        if (typeof(queryParams) !== 'string') {
+        if (typeof (queryParams) !== 'string') {
             for (let property in queryParams) {
                 if (queryParams.hasOwnProperty(property)) {
                     const prop = queryParams[property];
@@ -200,14 +204,14 @@ export class VsoClient {
             }
         }
 
-        if (queryString === '' && prefix.length > 0){
+        if (queryString === '' && prefix.length > 0) {
             // Date.prototype.toString() returns a string that is not valid for the REST API.
             // Need to specially call `toUTCString()` instead for such cases
             const queryValue = typeof queryParams === 'object' && 'toUTCString' in queryParams ? (queryParams as Date).toUTCString() : queryParams.toString();
 
 
             // Will always need to chop period off of end of prefix
-            queryString = prefix.slice(0,-1) + '=' + encodeURIComponent(queryValue) + '&';
+            queryString = prefix.slice(0, -1) + '=' + encodeURIComponent(queryValue) + '&';
         }
         return queryString;
     }
@@ -216,7 +220,7 @@ export class VsoClient {
         const queryString: string = '?' + this.queryParamsToStringHelper(queryParams, '');
 
         // Will always need to slice either a ? or & off of the end
-        return queryString.slice(0,-1);
+        return queryString.slice(0, -1);
     }
 
     protected getRequestUrl(routeTemplate: string, area: string, resource: string, routeValues: any, queryParams?: any): string {

package.json

@@ -1,7 +1,7 @@
 {
     "name": "azure-devops-node-api",
     "description": "Node client for Azure DevOps and TFS REST APIs",
-    "version": "12.1.0",
+    "version": "12.1.1",
     "main": "./WebApi.js",
     "types": "./WebApi.d.ts",
     "scripts": {

test/units/tests.ts

@@ -228,6 +228,23 @@ describe('VSOClient Units', function () {
         //Assert
         assert(res.id === "testLocation");
     });
+
+    it('Returns \'undefined\' when the location is not found', async () => {
+        nock('https://dev.azure.com/_apis/testArea8', {
+            //Arrange
+            reqheaders: {
+                'accept': 'application/json',
+                'user-agent': 'testAgent'
+            }})
+            .options('')
+            .reply(404, 'Not Found"');
+
+        //Act
+        const res = await vsoClient.beginGetLocation('testArea8', 'testLocation');
+
+        //Assert
+        assert(res === undefined);
+    })
 });
 
 describe('WebApi Units', function () {