fix(backend): Add missing details to backend API errors (#2421)

This was caused by API errors beeing parsed twice. Once in the response
error handling and again when initializing a new ClerkAPIResponseError.

.changeset/lucky-snails-help.md

@@ -0,0 +1,5 @@
+---
+'@clerk/backend': patch
+---
+
+Fixed a bug where backend API responses where missing error details. This was caused by parsing the errors twice once in the response error handling code and again when initializing the ClerkAPIResponseError.

packages/backend/src/api/factory.test.ts

@@ -150,7 +150,14 @@ export default (QUnit: QUnit) => {
     });
 
     test('executes a failed backend API request and parses the error response', async assert => {
-      const mockErrorPayload = { code: 'whatever_error', message: 'whatever error', meta: {} };
+      const mockErrorPayload = {
+        code: 'whatever_error',
+        message: 'whatever error',
+        long_message: 'some long message',
+        meta: {
+          param_name: 'whatever_param',
+        },
+      };
       const traceId = 'trace_id_123';
       fakeFetch = sinon.stub(runtime, 'fetch');
       fakeFetch.onCall(0).returns(jsonNotOk({ errors: [mockErrorPayload], clerk_trace_id: traceId }));
@@ -162,6 +169,9 @@ export default (QUnit: QUnit) => {
         assert.equal(e.clerkError, true);
         assert.equal(e.status, 422);
         assert.equal(e.errors[0].code, 'whatever_error');
+        assert.equal(e.errors[0].message, 'whatever error');
+        assert.equal(e.errors[0].longMessage, 'some long message');
+        assert.equal(e.errors[0].meta.paramName, 'whatever_param');
       }
 
       assert.ok(

packages/backend/src/api/request.ts

@@ -51,18 +51,22 @@ type LegacyRequestFunction = <T>(requestOptions: ClerkBackendApiRequestOptions)
  * TODO: Simply remove this wrapper and the ClerkAPIResponseError before the v5 release.
  */
 const withLegacyReturn =
-  (cb: any): LegacyRequestFunction =>
+  (cb: (...args: any) => Promise<ClerkBackendApiResponse<any>>): LegacyRequestFunction =>
   async (...args) => {
-    // @ts-ignore
-    const { data, errors, status, statusText, clerkTraceId } = await cb<T>(...args);
-    if (errors === null) {
-      return data;
+    const response = await cb(...args);
+    if (response.errors === null) {
+      return response.data;
     } else {
-      throw new ClerkAPIResponseError(statusText || '', {
-        data: errors,
+      const { errors, clerkTraceId } = response;
+      // TODO: To be removed with withLegacyReturn
+      const { status, statusText } = response as any;
+      const error = new ClerkAPIResponseError(statusText || '', {
+        data: [],
         status: status || '',
         clerkTraceId,
       });
+      error.errors = errors;
+      throw error;
     }
   };