refactor(cli): consolidate getErrorMessage utility to core (#22190)

packages/cli/src/utils/errors.test.ts

@@ -21,7 +21,6 @@ import {
   coreEvents,
 } from '@google/gemini-cli-core';
 import {
-  getErrorMessage,
   handleError,
   handleToolError,
   handleCancellationError,
@@ -152,25 +151,6 @@ describe('errors', () => {
     processExitSpy.mockRestore();
   });
 
-  describe('getErrorMessage', () => {
-    it('should return error message for Error instances', () => {
-      const error = new Error('Test error message');
-      expect(getErrorMessage(error)).toBe('Test error message');
-    });
-
-    it('should convert non-Error values to strings', () => {
-      expect(getErrorMessage('string error')).toBe('string error');
-      expect(getErrorMessage(123)).toBe('123');
-      expect(getErrorMessage(null)).toBe('null');
-      expect(getErrorMessage(undefined)).toBe('undefined');
-    });
-
-    it('should handle objects', () => {
-      const obj = { message: 'test' };
-      expect(getErrorMessage(obj)).toBe('[object Object]');
-    });
-  });
-
   describe('handleError', () => {
     describe('in text mode', () => {
       beforeEach(() => {

packages/cli/src/utils/errors.ts

@@ -18,16 +18,10 @@ import {
   isFatalToolError,
   debugLogger,
   coreEvents,
+  getErrorMessage,
 } from '@google/gemini-cli-core';
 import { runSyncCleanup } from './cleanup.js';
 
-export function getErrorMessage(error: unknown): string {
-  if (error instanceof Error) {
-    return error.message;
-  }
-  return String(error);
-}
-
 interface ErrorWithCode extends Error {
   exitCode?: number;
   code?: string | number;