Master Cursor v0.60 Multi-File Edits in 12 Minutes

Problem: Refactoring Across Multiple Files Is Still Manual

You need to rename a function used in 15 files, update import paths across a monorepo, or migrate from deprecated APIs - but doing this manually is error-prone and takes hours.

You'll learn:

• How Cursor's Composer handles multi-file edits with natural language
• The difference between Chat and Composer modes
• When multi-file edits fail and how to fix them

Time: 12 min | Level: Intermediate

Why This Happens

Traditional editors require you to manually find-and-replace or write complex regex patterns. Even with LSP support, cross-file refactoring breaks when dealing with dynamic imports, string literals, or non-standard patterns.

Common symptoms:

• Missed references in test files or config
• Breaking changes during API migrations
• Inconsistent naming across modules
• Hours spent on mechanical edits

Solution

Step 1: Install Cursor v0.60+

# Check current version
cursor --version

# Expected: 0.60.0 or higher

If below v0.60: Download from cursor.com - multi-file Composer was added in v0.60.

Step 2: Open Composer Mode

Keyboard shortcut: Cmd+I (Mac) or Ctrl+I (Windows/Linux)

Or: Click the "Composer" button in the top-right toolbar.

Key difference from Chat:

• Chat (Cmd+L): Explains code, answers questions, single-file edits
• Composer (Cmd+I): Makes actual changes across multiple files

// Composer understands context across your entire workspace
// Chat only sees the current file unless you explicitly @ mention others

Step 3: Write Natural Language Instructions

Example 1: Rename a function everywhere

Rename `fetchUserData` to `getUserProfile` across all files in /src

What Cursor does:

1. Searches workspace for all references
2. Handles imports, exports, and JSDoc comments
3. Updates test files and mocks
4. Shows preview of all changes before applying

Expected: Preview panel showing 8-12 files with highlighted changes.

Example 2: Migrate deprecated API

Replace all instances of React.FC with React.FunctionComponent.
Update prop type syntax to use the new format.

Why this works: Cursor's AI understands semantic meaning, not just text matching. It won't replace FC in unrelated contexts like FTP or FCM.

Step 4: Review Changes Before Accepting

Critical step: Cursor shows a diff view with all proposed changes.

✓ src/components/User.tsx (3 changes)
✓ src/hooks/useUser.ts (1 change)
✓ src/utils/api.ts (2 changes)
✗ src/legacy/old-api.ts (skipped - deprecated)

Check for:

• Unexpected files being modified
• Comments or strings that shouldn't change
• Test files that need manual assertion updates

Accept all: Cmd+Shift+Enter
Accept file-by-file: Click individual checkboxes
Reject: Esc to cancel

Step 5: Handle Edge Cases

If Cursor misses files:

Also update the instances in /tests and /mocks directories

If changes are too aggressive:

Only change function names in /src/api, leave /legacy unchanged

If you need to undo:

# Cursor integrates with Git
git diff  # Review what actually changed
git checkout -- .  # Revert if needed

Advanced: Composer with Context

Using @ Mentions for Precision

@src/types/User.ts Rename UserData interface to UserProfile
and update all files that import it

This tells Cursor: Start from this specific file and trace dependencies.

Chaining Multiple Operations

1. Change all API endpoints from /v1 to /v2
2. Update the response type from UserResponse to UserV2Response
3. Add error handling for the new 429 rate limit status

Cursor processes these sequentially, applying each change before moving to the next.

Working with Monorepos

In the @packages/auth folder, rename AuthProvider to AuthenticationProvider.
Update imports in @packages/web and @packages/mobile

Why this matters: Cursor respects workspace boundaries and won't accidentally modify node_modules or unrelated packages.

Verification

Test 1: Check all references updated

# Search for old function name
rg "fetchUserData" src/

# Expected: No results (or only in comments/docs)

Test 2: Run type checker

npm run typecheck
# or
tsc --noEmit

You should see: No errors related to renamed symbols.

Test 3: Run tests

npm test

If tests fail:

• Check mocks/fixtures weren't updated
• Update test assertions manually (Cursor won't change expected values)
• Verify dynamic imports with string literals

What You Learned

• Composer (Cmd+I) makes cross-file edits, Chat (Cmd+L) explains code
• Natural language works better than regex for semantic refactoring
• Always review diffs - AI can miss edge cases in legacy code
• Use @ mentions to give Cursor starting points for large refactors

Limitations:

• Struggles with generated code (GraphQL types, Prisma schemas)
• Won't modify files in .gitignore by default
• Context window limits to ~50 files per operation

Real-World Use Cases

1. API Version Migration

Before: Manually updating 30 files to use new authentication flow.

Cursor command:

Update all API calls to use the new auth header format from
Authorization: Bearer {token} to X-API-Key: {token}.
Handle both axios and fetch calls.

Time saved: 45 minutes → 3 minutes

2. Component Library Migration

Before: Moving from Material-UI v4 to v5 required reading migration docs and updating each import.

Cursor command:

Replace all @material-ui/core imports with @mui/material.
Update makeStyles to use sx prop instead.
Only modify components in /src/components, skip /src/legacy.

Time saved: 2 hours → 8 minutes

3. Deprecation Cleanup

Before: Finding and removing a deprecated utility function used across 20 test files.

Cursor command:

Remove all imports of formatDateLegacy from /src/utils/date.
Replace usage with the native Intl.DateTimeFormat.
Update tests to use the new format.

Time saved: 30 minutes → 5 minutes

Common Pitfalls

❌ Mistake 1: Not Specifying Scope

Bad:

Rename UserData to User

Why it fails: Could rename database models, API types, test fixtures - everything.

Good:

Rename the UserData interface in /src/types to User.
Update imports in /src/components only.

❌ Mistake 2: Ignoring String Literals

Bad:

Change all references to "fetchData"

Why it fails: Cursor might miss:

• Dynamic imports: import(./${endpoint})
• API endpoints: fetch("/api/fetchData")
• Test descriptions: it("should fetchData correctly")

Good:

Rename the fetchData function to loadData.
Also update string literals in API routes and test descriptions.

❌ Mistake 3: Not Checking Dependencies

Bad: Renaming a function without checking if it's exported in index.ts.

Good:

Rename getUserById to findUserById.
Update all imports, exports, and the public API in /src/index.ts.

Performance Tips

For Large Codebases (1000+ files)

1. Use specific paths:

Only search in @src/features/auth for AuthContext references

2. Break into chunks:

First, update /src/api files

Then in a new Composer session:

Now update /src/components to use the new API

3. Exclude irrelevant directories:

Ignore /dist, /build, and /coverage when searching

Speed Benchmarks (on MacBook Pro M3)

Times include AI processing + diff generation, not including your review time.

Troubleshooting

Issue: Cursor Doesn't Find All References

Cause: File not in workspace or excluded by .gitignore.

Fix:

Also check files in /scripts and /config directories

Or add to .cursorrules:

# .cursorrules
Always include files in /scripts when searching for references

Issue: Changes Look Wrong in Preview

Cause: Cursor misunderstood context or found false positives.

Fix: Be more specific:

Only change the fetchUser function in api.ts, not the one in mock-api.ts

Issue: Composer Hangs on Large Operations

Cause: Too many files or complex dependencies.

Fix: Break it down:

First pass: Update just the /src/api directory

Then create a new Composer session for the next batch.

Advanced Patterns

Pattern 1: Conditional Replacements

In all React components, replace class components with functional components.
Keep class components in /src/legacy unchanged.
Add hooks for lifecycle methods.

Cursor understands "if this, then that" logic.

Pattern 2: Style Consistency

Convert all inline styles to Tailwind classes.
Use the following mapping:
- style={{display: 'flex'}} → className="flex"
- style={{justifyContent: 'center'}} → className="justify-center"

Cursor can handle lookup tables in your instructions.

Pattern 3: Error Boundary Addition

Wrap all route components in /src/pages with ErrorBoundary.
Import from @/components/ErrorBoundary.
Preserve existing props and layouts.

Cursor adds wrapping components while maintaining structure.

Integration with Git

Recommended Workflow

# 1. Create a feature branch
git checkout -b refactor/rename-user-api

# 2. Run Cursor Composer
# (Make your multi-file changes)

# 3. Review the diff
git diff --stat

# 4. Commit with clear message
git commit -m "refactor: rename UserData to UserProfile across codebase"

# 5. Run tests before pushing
npm test && git push

Why this matters: Multi-file edits are easier to review in a PR when isolated.

Keyboard Shortcuts Cheat Sheet

Comparison with Other Tools

vs. GitHub Copilot

Copilot: Line-by-line autocomplete, single file context
Cursor Composer: Multi-file refactoring, workspace-aware changes

Use Copilot for: Writing new functions
Use Cursor for: Modifying existing code across files

vs. VSCode Find and Replace

Find/Replace: Text-based, requires regex knowledge
Cursor: Semantic understanding, handles imports automatically

Example:
Find/Replace misses: const { fetchUser } = api;
Cursor catches it: Understands destructured imports

vs. Manual Refactoring

Manual: Full control, but slow and error-prone
Cursor: Fast, but requires review

Best practice: Use Cursor for 80% of work, manually handle edge cases.

When NOT to Use Multi-File Edits

❌ Avoid for:

1. Database migrations - Use proper migration tools
2. Generated code - Regenerate instead of editing
3. Minified/bundled files - Work with source files
4. Binary or config files - Unless you're sure Cursor understands the format

✅ Perfect for:

1. Function/variable renaming across modules
2. API version migrations in application code
3. Deprecation cleanup for old utilities
4. Import path updates during refactors
5. Consistent naming conventions enforcement

Configuration Tips

.cursorrules Example

Create a .cursorrules file in your project root:

# Project-specific Cursor rules

When refactoring:
- Always update test files in __tests__ directories
- Preserve JSDoc comments
- Keep legacy/ folder unchanged unless explicitly requested
- Update TypeScript types alongside implementation

Exclude from multi-file operations:
- node_modules/
- dist/
- build/
- .next/
- coverage/

Default to:
- Semantic changes over text replacement
- Preserving code style (tabs vs spaces)
- Adding TODO comments for manual review items

This guides Cursor's behavior for your specific project.

Future Features (Coming Soon)

Based on Cursor's roadmap:

• Undo/Redo for Composer: Easy rollback of multi-file changes
• Conflict Resolution: Better handling when multiple devs edit same files
• Batch Operations: Queue multiple refactors to run overnight
• Diff Annotations: Inline explanations of why each change was made

Last updated: February 2026

Final Checklist

Before accepting Composer changes:

• Review every file in the diff
• Check tests still pass
• Verify no unintended files modified
• Confirm imports are correct
• Search for old references: rg "oldName" src/
• Run type checker: npm run typecheck
• Commit changes to Git immediately

Tested on Cursor v0.60.4, TypeScript 5.5+, React 19, macOS & Windows 11