Windows: Update context directory regex to match Windows-style file patterns (#1014)

I have added tests, but here also a screenshot from Windows machine
correctly matching current directory from the caller:

<img width="1097" height="501" alt="Screenshot 2025-11-07 at 19 37 41"
src="https://github.com/user-attachments/assets/95e3f7e2-efd2-44f9-867e-6de54400c07a"
/>

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Enhances `matchFileDir` to parse Windows and file:// stack trace paths
and adds tests; include changeset for patch release.
> 
> - **packages/js-sdk**:
>   - **Template utils (`src/template/utils.ts`)**:
> - Update `matchFileDir` regex and normalization to support Windows
drive letters, backslashes, and `file:///` URIs; strip `:line:column`
and trailing `)`.
>   - **Tests (`tests/template/utils/matchFileDir.test.ts`)**:
> - Add cases for Windows paths (with/without anonymous), `file:///`
URIs, and paths containing parentheses.
> - **Release**:
> - Add changeset (`.changeset/every-wolves-brake.md`) marking a patch
for `e2b`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
eb53033. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: mishushakov

.changeset/every-wolves-brake.md

@@ -0,0 +1,5 @@
+---
+'e2b': patch
+---
+
+fixes default context directory for windows paths

packages/js-sdk/src/template/utils.ts

@@ -182,14 +182,28 @@ export function getCallerFrame(depth: number): string | undefined {
  * Matches patterns like:
  * - "at <anonymous> (/path/to/file.js:1:1)"
  * - "at /path/to/file.js:1:1"
- *
+ * - "at <anonymous> (file:///C:/path/to/file.js:1:1)"
+ * - "at (file:///C:/path/to/file.js:1:1)"
  * @param line A line from a stack trace
  * @returns The directory of the file, or undefined if not found
  */
 export function matchFileDir(line: string): string | undefined {
-  const match = line.match(/\/[^:]+/)
+  const match = line.match(
+    /(?:file:\/\/\/)?([A-Za-z]:)?([/\\][^:]+)(?::\d+:\d+)?\)?/
+  )
   if (match) {
-    const filePath = match[0]
+    // Extract the full matched path
+    let filePath = match[0]
+
+    // Remove file:/// protocol prefix if present
+    filePath = filePath.replace(/^file:\/\/\//, '')
+
+    // Remove trailing closing parenthesis if present
+    filePath = filePath.replace(/\)$/, '')
+
+    // Remove :line:column suffix if present
+    filePath = filePath.replace(/:\d+:\d+$/, '')
+
     return path.dirname(filePath)
   }
 }

packages/js-sdk/tests/template/utils/matchFileDir.test.ts

@@ -1,10 +1,78 @@
 import { expect, test } from 'vitest'
 import { matchFileDir } from '../../../src/template/utils'
 
+// Basic Unix/Linux paths
 test('matchFileDir', () => {
   expect(matchFileDir('at /path/to/file.js:1:1')).toBe('/path/to')
 })
 
 test('matchFileDir (anonymous)', () => {
   expect(matchFileDir('at <anonymous> (/path/to/file.js:1:1)')).toBe('/path/to')
 })
+
+test('matchFileDir Unix path with spaces', () => {
+  expect(matchFileDir('at /home/user/my project/file.js:1:1')).toBe(
+    '/home/user/my project'
+  )
+})
+
+test('matchFileDir Unix path with special characters', () => {
+  expect(matchFileDir('at /path/to-my_dir.test/file.js:1:1')).toBe(
+    '/path/to-my_dir.test'
+  )
+})
+
+test('matchFileDir Unix root directory', () => {
+  expect(matchFileDir('at /file.js:1:1')).toBe('/')
+})
+
+test('matchFileDir Unix path with @symbol (scoped packages)', () => {
+  expect(matchFileDir('at /node_modules/@scope/package/index.js:1:1')).toBe(
+    '/node_modules/@scope/package'
+  )
+})
+
+test('matchFileDir Unix path with brackets (Next.js dynamic routes)', () => {
+  expect(matchFileDir('at /app/routes/[id]/page.js:1:1')).toBe(
+    '/app/routes/[id]'
+  )
+})
+
+// Basic Windows paths (forward slash)
+test('matchFileDir Windows path', () => {
+  expect(matchFileDir('at C:/path/to/file.js:1:1')).toBe('C:/path/to')
+})
+
+test('matchFileDir Windows path (anonymous)', () => {
+  expect(matchFileDir('at <anonymous> (C:/path/to/file.js:1:1)')).toBe(
+    'C:/path/to'
+  )
+})
+
+test('matchFileDir Windows path with spaces', () => {
+  expect(matchFileDir('at C:/Program Files/App/index.js:1:1')).toBe(
+    'C:/Program Files/App'
+  )
+})
+
+// File protocol paths
+test('matchFileDir file:// protocol Windows', () => {
+  expect(matchFileDir('at <anonymous> (file:///C:/path/to/file.js:1:1)')).toBe(
+    'C:/path/to'
+  )
+})
+
+test('matchFileDir file:// protocol Windows (no anonymous)', () => {
+  expect(matchFileDir('at (file:///C:/path/to/file.js:1:1)')).toBe('C:/path/to')
+})
+
+// Paths with parentheses
+test('matchFileDir with parentheses in path', () => {
+  expect(matchFileDir('at /path/to(1)/file.js:1:1')).toBe('/path/to(1)')
+})
+
+test('matchFileDir with parentheses in path (anonymous)', () => {
+  expect(matchFileDir('at <anonymous> (/path/to(1)/file.js:1:1)')).toBe(
+    '/path/to(1)'
+  )
+})