bug(core): Ensure storage is initialized early, even if config is not. (#18471)

integration-tests/resume_repro.responses

@@ -0,0 +1 @@
+{"method":"generateContentStream","response":[{"candidates":[{"content":{"parts":[{"text":"Session started."}],"role":"model"},"finishReason":"STOP","index":0}]}]}

integration-tests/resume_repro.test.ts

@@ -0,0 +1,42 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { TestRig } from './test-helper.js';
+import * as path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+describe('resume-repro', () => {
+  let rig: TestRig;
+
+  beforeEach(() => {
+    rig = new TestRig();
+  });
+
+  afterEach(async () => await rig.cleanup());
+
+  it('should be able to resume a session without "Storage must be initialized before use"', async () => {
+    const responsesPath = path.join(__dirname, 'resume_repro.responses');
+    await rig.setup('should be able to resume a session', {
+      fakeResponsesPath: responsesPath,
+    });
+
+    // 1. First run to create a session
+    await rig.run({
+      args: 'hello',
+    });
+
+    // 2. Second run with --resume latest
+    // This should NOT fail with "Storage must be initialized before use"
+    const result = await rig.run({
+      args: ['--resume', 'latest', 'continue'],
+    });
+
+    expect(result).toContain('Session started');
+  });
+});