Introduce the @backstage/errors package.

Encode thrown errors in the backend as a JSON payload using a facility in that package, and render helpful frontend displays of those errors.

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

plugins/auth-backend/src/lib/catalog/CatalogIdentityClient.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { ConflictError, NotFoundError } from '@backstage/backend-common';
+import { ConflictError, NotFoundError } from '@backstage/errors';
 import { CatalogApi } from '@backstage/catalog-client';
 import { UserEntity } from '@backstage/catalog-model';
 

plugins/auth-backend/src/lib/oauth/OAuthAdapter.ts

@@ -22,7 +22,7 @@ import {
   BackstageIdentity,
   AuthProviderConfig,
 } from '../../providers/types';
-import { InputError } from '@backstage/backend-common';
+import { InputError } from '@backstage/errors';
 import { TokenIssuer } from '../../identity';
 import { verifyNonce } from './helpers';
 import { postMessageResponse, ensuresXRequestedWith } from '../flow';

plugins/auth-backend/src/lib/oauth/OAuthEnvironmentHandler.ts

@@ -16,7 +16,7 @@
 
 import express from 'express';
 import { Config } from '@backstage/config';
-import { InputError } from '@backstage/backend-common';
+import { InputError } from '@backstage/errors';
 import { readState } from './helpers';
 import { AuthProviderRouteHandlers } from '../../providers/types';
 

plugins/auth-backend/src/service/router.ts

@@ -23,10 +23,10 @@ import {
   AuthProviderFactory,
 } from '../providers';
 import {
-  NotFoundError,
   PluginDatabaseManager,
   PluginEndpointDiscovery,
 } from '@backstage/backend-common';
+import { NotFoundError } from '@backstage/errors';
 import { CatalogClient } from '@backstage/catalog-client';
 import { Config } from '@backstage/config';
 import { createOidcRouter, DatabaseKeyStore, TokenFactory } from '../identity';