chore: show underlying errors in fetch / xhr

packages/api-rest/src/apis/common/internalPost.ts

@@ -46,7 +46,7 @@
  * @param postInput.abortController The abort controller used to cancel the POST request
  * @returns a {@link RestApiResponse}
  *
- * @throws an {@link Error} with `Network error` as the `message` when the external resource is unreachable due to one
+ * @throws an {@link AmplifyError} with `Network Error` as the `message` when the external resource is unreachable due to one
  * of the following reasons:
  *   1. no network connection
  *   2. CORS error

packages/aws-amplify/package.json

@@ -293,7 +293,7 @@
 			"name": "[Analytics] record (Pinpoint)",
 			"path": "./dist/esm/analytics/index.mjs",
 			"import": "{ record }",
-			"limit": "17.18 kB"
+			"limit": "17.25 kB"
 		},
 		{
 			"name": "[Analytics] record (Kinesis)",
@@ -317,7 +317,7 @@
 			"name": "[Analytics] identifyUser (Pinpoint)",
 			"path": "./dist/esm/analytics/index.mjs",
 			"import": "{ identifyUser }",
-			"limit": "15.68 kB"
+			"limit": "15.75 kB"
 		},
 		{
 			"name": "[Analytics] enable",
@@ -353,13 +353,13 @@
 			"name": "[Auth] resetPassword (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ resetPassword }",
-			"limit": "12.53 kB"
+			"limit": "12.55 kB"
 		},
 		{
 			"name": "[Auth] confirmResetPassword (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ confirmResetPassword }",
-			"limit": "12.47 kB"
+			"limit": "12.50 kB"
 		},
 		{
 			"name": "[Auth] signIn (Cognito)",
@@ -371,7 +371,7 @@
 			"name": "[Auth] resendSignUpCode (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ resendSignUpCode }",
-			"limit": "12.49 kB"
+			"limit": "12.50 kB"
 		},
 		{
 			"name": "[Auth] confirmSignUp (Cognito)",
@@ -389,19 +389,19 @@
 			"name": "[Auth] updateMFAPreference (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ updateMFAPreference }",
-			"limit": "11.83 kB"
+			"limit": "11.85 kB"
 		},
 		{
 			"name": "[Auth] fetchMFAPreference (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ fetchMFAPreference }",
-			"limit": "11.86 kB"
+			"limit": "11.90 kB"
 		},
 		{
 			"name": "[Auth] verifyTOTPSetup (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ verifyTOTPSetup }",
-			"limit": "12.71 kB"
+			"limit": "12.75 kB"
 		},
 		{
 			"name": "[Auth] updatePassword (Cognito)",
@@ -419,7 +419,7 @@
 			"name": "[Auth] updateUserAttributes (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ updateUserAttributes }",
-			"limit": "11.95 kB"
+			"limit": "12.00 kB"
 		},
 		{
 			"name": "[Auth] getCurrentUser (Cognito)",
@@ -431,7 +431,7 @@
 			"name": "[Auth] confirmUserAttribute (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ confirmUserAttribute }",
-			"limit": "12.71 kB"
+			"limit": "12.75 kB"
 		},
 		{
 			"name": "[Auth] signInWithRedirect (Cognito)",
@@ -443,7 +443,7 @@
 			"name": "[Auth] fetchUserAttributes (Cognito)",
 			"path": "./dist/esm/auth/index.mjs",
 			"import": "{ fetchUserAttributes }",
-			"limit": "11.77 kB"
+			"limit": "11.80 kB"
 		},
 		{
 			"name": "[Auth] Basic Auth Flow (Cognito)",
@@ -479,7 +479,7 @@
 			"name": "[Storage] getUrl (S3)",
 			"path": "./dist/esm/storage/index.mjs",
 			"import": "{ getUrl }",
-			"limit": "15.90 kB"
+			"limit": "15.95 kB"
 		},
 		{
 			"name": "[Storage] list (S3)",
@@ -497,7 +497,7 @@
 			"name": "[Storage] uploadData (S3)",
 			"path": "./dist/esm/storage/index.mjs",
 			"import": "{ uploadData }",
-			"limit": "19.90 kB"
+			"limit": "19.95 kB"
 		}
 	]
 }

packages/core/package.json

@@ -82,13 +82,13 @@
 			"name": "Custom clients (fetch handler)",
 			"path": "./dist/esm/clients/handlers/fetch.mjs",
 			"import": "{ fetchTransferHandler }",
-			"limit": "500 B"
+			"limit": "575 B"
 		},
 		{
 			"name": "Custom clients (unauthenticated handler)",
 			"path": "./dist/esm/clients/handlers/unauthenticated.mjs",
 			"import": "{ unauthenticatedHandler }",
-			"limit": "1 kB"
+			"limit": "1.15 kB"
 		},
 		{
 			"name": "Custom clients (request signer)",

packages/core/src/clients/handlers/fetch.ts

@@ -3,7 +3,9 @@
 
 import { HttpRequest, HttpResponse, HttpTransferOptions } from '../types/http';
 import { TransferHandler } from '../types/core';
+import { AmplifyError } from '../../errors';
 import { withMemoization } from '../utils/memoization';
+import { AmplifyErrorCode } from '../../types';
 
 const shouldSendBody = (method: string) =>
 	!['HEAD', 'GET', 'DELETE'].includes(method.toUpperCase());
@@ -28,11 +30,12 @@ export const fetchTransferHandler: TransferHandler<
 			credentials: withCrossDomainCredentials ? 'include' : 'same-origin',
 		});
 	} catch (e) {
-		// TODO: needs to revise error handling in v6
-		// For now this is a thin wrapper over original fetch error similar to cognito-identity-js package.
-		// Ref: https://github.com/aws-amplify/amplify-js/blob/4fbc8c0a2be7526aab723579b4c95b552195a80b/packages/amazon-cognito-identity-js/src/Client.js#L103-L108
 		if (e instanceof TypeError) {
-			throw new Error('Network error');
+			throw new AmplifyError({
+				name: AmplifyErrorCode.NetworkError,
+				message: 'A network error has occurred.',
+				underlyingError: e,
+			});
 		}
 		throw e;
 	}

packages/core/src/errors/errorHelpers.ts

@@ -15,6 +15,9 @@ const amplifyErrorMap: AmplifyErrorMap<AmplifyErrorCode> = {
 	[AmplifyErrorCode.Unknown]: {
 		message: 'An unknown error occurred.',
 	},
+	[AmplifyErrorCode.NetworkError]: {
+		message: 'A network error has occurred.',
+	},
 };
 
 export const assert: AssertionFunction<AmplifyErrorCode> =

packages/core/src/types/errors.ts

@@ -5,6 +5,7 @@ export enum AmplifyErrorCode {
 	NoEndpointId = 'NoEndpointId',
 	PlatformNotSupported = 'PlatformNotSupported',
 	Unknown = 'Unknown',
+	NetworkError = 'NetworkError',
 }
 
 export interface AmplifyErrorParams<ErrorCode extends string = string> {

packages/storage/src/providers/s3/utils/client/runtime/xhrTransferHandler.ts

@@ -12,6 +12,7 @@ import { ConsoleLogger } from '@aws-amplify/core';
 
 import { TransferProgressEvent } from '../../../../../types/common';
 import { CanceledError } from '../../../../../errors/CanceledError';
+import { StorageError } from '../../../../../errors/StorageError';
 
 import {
 	ABORT_ERROR_CODE,
@@ -80,10 +81,10 @@ export const xhrTransferHandler: TransferHandler<
 		}
 
 		xhr.addEventListener('error', () => {
-			const networkError = buildHandlerError(
-				NETWORK_ERROR_MESSAGE,
-				NETWORK_ERROR_CODE,
-			);
+			const networkError = new StorageError({
+				message: NETWORK_ERROR_MESSAGE,
+				name: NETWORK_ERROR_CODE,
+			});
 			logger.error(NETWORK_ERROR_MESSAGE);
 			reject(networkError);
 			xhr = null; // clean up request