more strict error type checking in most packages and backend plugins

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/kubernetes-backend/package.json

@@ -35,6 +35,7 @@
     "@backstage/backend-common": "^0.9.4",
     "@backstage/catalog-model": "^0.9.3",
     "@backstage/config": "^0.1.10",
+    "@backstage/errors": "^0.1.2",
     "@backstage/plugin-kubernetes-common": "^0.1.4",
     "@google-cloud/container": "^2.2.0",
     "@kubernetes/client-node": "^0.15.0",

plugins/kubernetes-backend/src/cluster-locator/GkeClusterLocator.test.ts

@@ -213,7 +213,7 @@ describe('GkeClusterLocator', () => {
       } as any);
 
       await expect(sut.getClusters()).rejects.toThrow(
-        'There was an error retrieving clusters from GKE for projectId=some-project region=some-region : [some error]',
+        'There was an error retrieving clusters from GKE for projectId=some-project region=some-region; caused by Error: some error',
       );
 
       expect(mockedListClusters).toBeCalledTimes(1);

plugins/kubernetes-backend/src/cluster-locator/GkeClusterLocator.ts

@@ -15,6 +15,7 @@
  */
 
 import { Config } from '@backstage/config';
+import { ForwardedError } from '@backstage/errors';
 import * as container from '@google-cloud/container';
 import { GKEClusterDetails, KubernetesClustersSupplier } from '../types/types';
 
@@ -65,8 +66,9 @@ export class GkeClusterLocator implements KubernetesClustersSupplier {
         skipTLSVerify,
       }));
     } catch (e) {
-      throw new Error(
-        `There was an error retrieving clusters from GKE for projectId=${projectId} region=${region} : [${e.message}]`,
+      throw new ForwardedError(
+        `There was an error retrieving clusters from GKE for projectId=${projectId} region=${region}`,
+        e,
       );
     }
   }