Fix dollar sign replacement bug in file editing (#7703)

packages/core/src/tools/smart-edit.test.ts

@@ -46,11 +46,11 @@ import {
   type Mock,
 } from 'vitest';
 import {
-  applyReplacement,
   SmartEditTool,
   type EditToolParams,
   calculateReplacement,
 } from './smart-edit.js';
+import { applyReplacement } from './edit.js';
 import { type FileDiff, ToolConfirmationOutcome } from './tools.js';
 import { ToolErrorType } from './tool-error.js';
 import path from 'node:path';
@@ -169,6 +169,22 @@ describe('SmartEditTool', () => {
         'hello new world new',
       );
     });
+
+    it('should treat $ literally and not as replacement pattern', () => {
+      const current = 'regex end is $ and more';
+      const oldStr = 'regex end is $';
+      const newStr = 'regex end is $ and correct';
+      const result = applyReplacement(current, oldStr, newStr, false);
+      expect(result).toBe('regex end is $ and correct and more');
+    });
+
+    it("should treat $' literally and not as a replacement pattern", () => {
+      const current = 'foo';
+      const oldStr = 'foo';
+      const newStr = "bar$'baz";
+      const result = applyReplacement(current, oldStr, newStr, false);
+      expect(result).toBe("bar$'baz");
+    });
   });
 
   describe('calculateReplacement', () => {