Best Practices for Manual Merge Resolution

Manual Merge Best Practices

Manual merge is the most powerful conflict resolution strategy. It gives you complete control over the final output, which is essential when neither "ours" nor "theirs" nor "both" produces the correct result. Most real-world conflicts in function bodies, complex configurations, and interrelated code changes require manual resolution.

Step-by-Step Process

1. Understand both branches' intent

Before writing any code, read both versions and understand why each change was made. Check the commit messages, pull request descriptions, and any related issues. Understanding the why behind each change is more important than the what.

2. Identify common ground

Look for lines that are identical in both versions. These are your anchor points — they should definitely be in the resolution.

3. Map the differences

Create a mental (or written) list of what each branch adds, removes, or modifies:

• Branch A added error handling
• Branch B changed the return type
• Both branches updated the logging format

4. Write the unified version

Starting from the common ground, incorporate changes from both branches. Resolve any contradictions by choosing the approach that best serves the codebase.

5. Validate thoroughly

• Does the code compile/parse?
• Do all tests pass?
• Does the logic handle edge cases from both branches?
• Are there any unused variables or imports?

Common Mistakes

• Copy-paste errors: Accidentally including conflict markers in the resolution.
• Incomplete merges: Incorporating one branch's changes to a function signature but not updating the callers.
• Lost context: Removing comments or documentation that explain important decisions.

When to Seek Help

If a conflict involves complex business logic, consider pair-programming the resolution with the author of the other branch. Two perspectives lead to better merge outcomes.