fix(core): cache CLI version to ensure consistency during sessions (#18793)

packages/core/src/utils/version.test.ts

@@ -5,7 +5,7 @@
  */
 
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
-import { getVersion } from './version.js';
+import { getVersion, resetVersionCache } from './version.js';
 import { getPackageJson } from './package.js';
 
 vi.mock('./package.js', () => ({
@@ -17,6 +17,8 @@ describe('version', () => {
 
   beforeEach(() => {
     vi.resetModules();
+    vi.clearAllMocks();
+    resetVersionCache();
     process.env = { ...originalEnv };
     vi.mocked(getPackageJson).mockResolvedValue({ version: '1.0.0' });
   });
@@ -43,4 +45,20 @@ describe('version', () => {
     const version = await getVersion();
     expect(version).toBe('unknown');
   });
+
+  it('should cache the version and only call getPackageJson once', async () => {
+    delete process.env['CLI_VERSION'];
+    vi.mocked(getPackageJson).mockResolvedValue({ version: '1.2.3' });
+
+    const version1 = await getVersion();
+    expect(version1).toBe('1.2.3');
+    expect(getPackageJson).toHaveBeenCalledTimes(1);
+
+    // Change the mock value to simulate an update on disk
+    vi.mocked(getPackageJson).mockResolvedValue({ version: '2.0.0' });
+
+    const version2 = await getVersion();
+    expect(version2).toBe('1.2.3'); // Should still be the cached version
+    expect(getPackageJson).toHaveBeenCalledTimes(1); // Should not have been called again
+  });
 });