Use OpenClaw to Refactor a Codebase

Introduction: Scaling Code Changes Across Files

This tutorial shows intermediate developers how to use OpenClaw to refactor an entire codebase, not just individual files. Refactoring at scale—migrating from JavaScript to TypeScript, adding error boundaries across components, updating a deprecated library across dozens of files—is tedious and error-prone when done manually. OpenClaw automates the analysis, planning, and execution while you handle the review. By the end of this tutorial, you'll understand how to scope large refactoring tasks, review OpenClaw's plan, iterate when needed, and merge high-quality changes back to your codebase.

Refactoring across many files is tedious and error-prone. This tutorial shows how to use OpenClaw for large-scale code changes—with full context, consistency, and your control.

Prerequisites: What You Need

Before starting, ensure you have:

• OpenClaw installed with file system and shell access. The file system skill lets OpenClaw read and edit files across your codebase. Shell access lets it run tools like tsc, npm, git, and linters.
• A codebase to refactor. It can be:
  • A JavaScript/TypeScript project
  • A Python project
  • A Go service
  • Any codebase with consistent patterns
• Git initialized. Run git init if not already done. This lets you commit before and after, so you can easily rollback if something goes wrong.
• Dependencies installed. Run npm install, pip install, or equivalent. OpenClaw needs to be able to run tools (tsc, linters, type checkers).

Step 1: Scope Your Refactoring Task Precisely

The more specific you are, the better OpenClaw performs. Vague requests like "refactor everything" lead to confusion and inconsistent results. Instead, be specific about:

• Which files or folders (e.g., /components, /services, not the entire repo)
• What change (JavaScript to TypeScript, add error boundaries, update API calls)
• What should NOT change (preserve behavior, preserve existing tests)

Example: JavaScript to TypeScript

Instead of:

Refactor my codebase to TypeScript

Use:

Refactor the /src/components folder from JavaScript to TypeScript.
Add proper PropTypes definitions for all React components.
Update function signatures with parameter and return type annotations.
Run `npm run type-check` to verify—fix any type errors.
Preserve all existing functionality and behavior.

This is much clearer. OpenClaw understands exactly what you want.

Step 2: Commit Before Starting

Before OpenClaw touches anything, commit your current state:

git add .
git commit -m "Pre-refactor checkpoint"

Why this matters: If something goes wrong—OpenClaw makes a bad decision, you change your mind, you want to compare—you can instantly revert:

git reset --hard HEAD~1

You're done when: git log shows your commit. You have a safe fallback.

Step 3: Send the Refactoring Request

In your chat app, send OpenClaw the refactoring task:

Refactor the /src/components folder from JavaScript to TypeScript.
Add proper PropTypes definitions for all React components.
Update function signatures with parameter and return type annotations.
Run `npm run type-check` to verify—fix any type errors.
Preserve all existing functionality and behavior.

What to expect: OpenClaw will:

1. Read the file structure of /src/components
2. Analyze each .js file to understand its purpose, props, state
3. Generate a plan: "I found 12 components. I will add TypeScript definitions to each..."
4. Wait for your approval before executing

The plan might look like:

I found 12 JavaScript components:
- Button.js (simple, 50 lines, props: label, onClick, disabled)
- Card.js (container, 80 lines, props: children, title, className)
- Modal.js (complex, 200 lines, props: open, onClose, onConfirm, children)
... (9 more)

I will:
1. Rename each to .tsx
2. Extract prop types into TypeScript interfaces
3. Add function return types
4. Run `npm run type-check` to find remaining errors
5. Iterate to fix type errors

Estimated time: 2-3 minutes

What to look for: Does the list of files match what you wanted? Does the plan align with your request?

If not, adjust: "Skip the Modal.js file; I'll refactor that separately."

Step 4: Review the Plan

Read the plan carefully. You're looking for:

• Correct file list. Are all the files it found the ones you wanted to refactor?
• Right approach. Does the method make sense? (For TypeScript, extracting interfaces is the right approach.)
• No surprises. Will this break anything? Does it match your intent?

If anything seems off, say so:

That looks good, but skip Grid.js—I handle that separately.

OpenClaw will adjust the plan and re-present it.

You're done when: The plan matches your vision and you're confident in the approach.

Step 5: Approve and Execute

Once you're happy with the plan, approve it:

Go ahead.

What to expect: OpenClaw starts executing. You'll see:

Starting refactor...
Refactoring Button.js → Button.tsx
Refactoring Card.js → Card.tsx
Refactoring Modal.js → Modal.tsx
...
Running type checker...
Found 3 type errors in Modal.tsx:
  Line 45: 'onConfirm' callback missing parameters
  Line 62: Return type mismatch
  ...
Fixing type errors...
Re-running type checker...
All type checks passed!

What to look for: Does the progress make sense? Are the errors it found real? (Sometimes the AI makes mistakes; watch for them.)

What might go wrong: If you see an error like "npm run type-check not found," OpenClaw tried to run a command that doesn't exist. Respond:

type-check isn't a script. Use `npx tsc` instead.

OpenClaw will adjust and continue.

Step 6: Review the Results

After execution, OpenClaw reports what it did. Now review the actual changes:

git diff

This shows exactly what changed. Look for:

• Proper TypeScript syntax. Are the types correctly inferred? Are interfaces well-structured?
• Preserved logic. Did it keep the original behavior or accidentally change something?
• Code style consistency. Do the changes match your project's existing style?

You might see something like:

interface ButtonProps {
  label: string;
  onClick: (event: React.MouseEvent) => void;
  disabled?: boolean;
}

const Button: React.FC<ButtonProps> = ({ label, onClick, disabled }) => {
  return <button onClick={onClick} disabled={disabled}>{label}</button>;
};

Is this good? Does it match your codebase conventions?

If you spot issues:

The interfaces look good, but Modal.tsx has a missing null check in the onConfirm handler. Please add that.

OpenClaw iterates. You're in a conversation, not a one-shot process.

Step 7: Iterate If Needed

Refactoring rarely gets everything right on the first try. If you see issues, ask OpenClaw to fix them:

Add unit tests for each component. Write tests that verify the prop types and behavior haven't changed.

Add error boundaries to the parent component that uses these. Wrap Modal in an ErrorBoundary to catch failures.

Update the storybook stories to reflect the new prop types. Each story should be TypeScript-compatible.

Each request refines the result. OpenClaw maintains context across your conversation, so it knows what was refactored and why.

Step 8: Commit the Changes

Once you're satisfied, commit:

git add .
git commit -m "Refactor /src/components to TypeScript

Added TypeScript definitions for all 12 components.
Extracted prop types into interfaces.
Ran type checker; all errors resolved.

Openclaw assisted with analysis and file edits."

Now you have a clear history. Later, if someone asks "why did we add types here?" you can check the commit message.

Best Practices: Making Refactors Successful

1. Start small. Don't refactor the entire codebase at once. Do one folder, validate it works, then expand. A 50-file refactor is riskier than a 5-file one.

2. Use version control religiously. Commit before, commit after, commit between iterations. Git is your safety net.

3. Run your tests. After OpenClaw finishes:

npm test

If tests fail, you have a clear picture of what broke. Show OpenClaw the errors and it can fix them.

4. Review diffs carefully. OpenClaw is good but not infallible. Look for:

• Logic changes that weren't intended
• Edge cases it might have missed
• Style inconsistencies

5. Ask for context understanding. If the refactor involves updating API calls, tell OpenClaw:

The API changed in v2.0. Update all calls from `getUser()` to `fetchUser()`. Wrap them in try/catch because the new API throws on missing users.

Context helps OpenClaw make better decisions.

6. Document why, not just what. When committing, explain the reasoning:

git commit -m "Migrate to TypeScript for type safety

This prevents runtime errors from prop mismatches.
Storybook integration now suggests correct props.
Future refactors in this folder are safer."

Troubleshooting

"npm run type-check failed with 50 errors": OpenClaw encountered a complex situation. The errors are real but numerous. Ask for help:

The type checker found 50 errors. Can you focus on the ones related to missing prop definitions? Leave the others for now.

"Changed behavior I didn't want": Revert and try again with more specific instructions:

git reset --hard HEAD~1  # Go back to before the refactor

Send a new request with more details:

Refactor /src/components to TypeScript. Be very careful not to change logic.
Only add type annotations. Don't restructure any functions or components.

"OpenClaw says it's done but it actually isn't": Ask it to verify:

Are all components in /src/components using TypeScript now? Run `find src/components -name '*.js'` to check for any remaining .js files.

OpenClaw can double-check its own work.

Next Steps

Now that you've refactored one folder, try:

1. Refactor related folders. If you migrated /src/components, do /src/hooks, /src/utils next.
2. Add more automation. "Add unit tests to all components." "Migrate to use the new React Query version."
3. Combine with other tasks. "Refactor, add tests, and update the documentation."
4. Build custom skills. If your codebase has custom patterns, build a skill that teaches OpenClaw about them.