Use Cases

See how Charlie can help with your daily development tasks

Charlie currently specializes in TypeScript codebases and integrates with GitHub and Linear. He learns from your codebase, documentation, and team interactions to provide the most relevant assistance.

Code Reviews

Scenario: You’ve opened a pull request and want Charlie’s feedback.

1. Automatic Review Trigger:

• Charlie automatically starts reviewing when PRs are marked “Ready for Review”
• He analyzes code changes, looking for:
  • Potential bugs and issues
  • Performance optimizations
  • TypeScript best practices
  • Security concerns
  • Code style and maintainability

2. Manual Review Request:

@CharlieHelps, would you mind reviewing this PR?

After analyzing the changes, he responds:

I’ve reviewed the changes in src/services/user.ts. Here’s what I found:

1. Performance Warning: The processUsers function could be optimized:
   // Current implementation in src/services/user.ts:27
   function processUsers(users: User[]) {
     const result = [];
     for (let i = 0; i < users.length; i++) {
       result.push(transform(users[i]));
     }
     return result;
   }
   

   Consider using Array.map() for better readability and performance:
   function processUsers(users: User[]) {
     return users.map(transform);
   }
   

2. TypeScript Improvement: Consider using type inference here instead of explicit typing
3. Security Note: Remember to validate user input before processing. See our validation patterns in src/utils/validation.ts

Additional Context: We implemented similar optimizations in PR #234 for the customer service. You can find more examples in src/utils/array-helpers.ts.

Technical Discussions

Scenario: You want to discuss code, search for documentation, or understand your codebase better.

1. Code Explanations:

@CharlieHelps, could you explain how our error handling system works?

After searching the codebase, he responds:

Let me explain our error handling patterns:

// From src/utils/error-handler.ts
export class APIError extends Error {
  constructor(
    message: string,
    public statusCode: number
  ) {
    super(message);
  }
}

Implementation Details:

• All errors are automatically reported to our error tracking service
• Each API endpoint has configurable error handling
• We follow a centralized logging approach

More Examples: You can find similar patterns in:

• src/middleware/error-middleware.ts
• src/utils/validation.ts

2. Documentation Search:

@CharlieHelps, could you find our rate limiting documentation?

After searching through the codebase and documentation, he responds:

Here are relevant resources about rate limiting:

1. Implementation in src/middleware/rate-limit.ts
2. Related PR #345 where we added Redis-based rate limiting
3. Configuration examples in src/config/rate-limit.ts

Best Practices:

• We use Redis for distributed rate limiting
• Each API endpoint has configurable limits
• Error responses follow our standard format

Code Contributions

Scenario: You want Charlie to help implement code changes.

1. Request Code Changes:

@CharlieHelps, could you help optimize this function to use async/await?

After analyzing and implementing the changes, he pushes the commits and responds:

Changes pushed in commit 7d20a7. Here’s what I did:

// Before - src/services/data.ts:156
function processData(data) {
  return new Promise((resolve, reject) => {
    fetch(url)
      .then((response) => response.json())
      .then((result) => resolve(transform(result)))
      .catch((error) => reject(error));
  });
}

// After
async function processData(data) {
  const response = await fetch(url);
  const result = await response.json();
  return transform(result);
}

Additional Updates:

• Updated related tests in src/services/__tests__/data.test.ts
• Added error handling for network failures
• Updated type definitions to reflect async nature

Linear Integration

Scenario: Getting development assistance directly in Linear.

1. Create PR from Linear Issue:

@CharlieHelps create a PR

After analyzing the requirements, he responds:

Created draft PR #789:

• Branch: team-456-fix-error-handling
• Title: “Implement robust error handling for user processor”
• Description includes context from this Linear issue
• Added basic implementation based on the requirements discussed in this thread

Additional Context: I’ve incorporated:

• The error handling patterns we discussed in the comments
• Requirements from the linked issues
• Implementation approach agreed upon in the thread
• Test scenarios mentioned in the acceptance criteria

Slack Integration

Scenario: Getting development assistance directly in Slack.

1. Code Review in Slack:

@Charlie review PR #123

After analyzing the PR, he responds:

I’ve reviewed PR #123. Here’s what I found:

1. src/services/auth.ts: Consider using optional chaining here
2. src/utils/transform.ts: This loop could be simplified with .map()
3. src/api/users.ts: Add error handling for the API call

Full Review: See my detailed comments in the PR.

2. Create PR from Linear Issue:

@Charlie create a PR from TEAM-456

After analyzing the requirements, he responds:

Created draft PR #790 from Linear issue TEAM-456:

• Branch: team-456-user-auth-timeout
• Title: “Fix user authentication timeout”
• Description includes context from Linear issue
• Running tests now…

Additional Context: I’ve incorporated the requirements and discussions from the Linear issue.