create-app: fix fetchYarnLockSeedTask timeout + add test

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

packages/create-app/src/lib/tasks.test.ts

@@ -471,5 +471,20 @@ describe('tasks', () => {
 
       expect(mockDir.content()).toEqual({});
     });
+
+    it('should time out if it takes too long to fetch', async () => {
+      worker.use(
+        rest.get(
+          'https://raw.githubusercontent.com/backstage/backstage/master/packages/create-app/seed-yarn.lock',
+          (_, res, ctx) => res(ctx.delay(5000)),
+        ),
+      );
+
+      mockDir.clear();
+
+      await expect(fetchYarnLockSeedTask(mockDir.path)).resolves.toBe(false);
+
+      expect(mockDir.content()).toEqual({});
+    });
   });
 });

packages/create-app/src/lib/tasks.ts

@@ -25,6 +25,7 @@ import {
   resolve as resolvePath,
   relative as relativePath,
 } from 'path';
+import fetch from 'node-fetch';
 import { exec as execCb } from 'child_process';
 import { packageVersions } from './versions';
 import { promisify } from 'util';
@@ -317,13 +318,15 @@ export async function fetchYarnLockSeedTask(dir: string) {
   try {
     await Task.forItem('fetching', 'yarn.lock seed', async () => {
       const controller = new AbortController();
-      setTimeout(() => controller.abort(), 5000);
+      const timeout = setTimeout(() => controller.abort(), 3000);
       const res = await fetch(
         'https://raw.githubusercontent.com/backstage/backstage/master/packages/create-app/seed-yarn.lock',
         {
           signal: controller.signal,
         },
       );
+      clearTimeout(timeout);
+
       if (!res.ok) {
         throw new Error(
           `Request failed with status ${res.status} ${res.statusText}`,