Frontend Code Reviews Best Practices

Code review is crucial in front-end development, and its core lies in ensuring quality and promoting collaboration. 1. Clarify the review objectives: not only to find low-level errors, but also to verify functional integrity, code maintainability and standard consistency. 2. Tool assistance: Automatically check format and type problems through ESLint, Prettier, TypeScript, etc. to improve efficiency. 3. Pay attention to user experience and performance: review rendering performance, resource loading, barrier-free design, etc., to ensure that optimization measures are in place. 4. Encourage constructive feedback: make suggestions in a specific, suggestive and friendly tone to promote the team's growth. Doing a good job of Code Review can significantly improve project quality and collaboration efficiency, avoiding being in a formal way or causing conflicts.

Code review is an important part of quality assurance in front-end development, especially in projects that are collaborated by multiple people. If you don’t do it well, it’s easy to get trapped. Many people think that Code Review is just to "see if there are any syntax errors", but in fact it is far more than that. A truly useful review is to start from the perspectives of maintainability, performance, security and team specifications.

1. Clarify the review objectives: not just find bugs

When many front-end colleagues do Code Review, their first reaction is to see if there are any low-level problems such as spelling errors or undefined variables. This is of course important, but more importantly:

• Is the function complete : For example, a form submission logic handles loading status and error prompts?
• Is the code easy to maintain : Is component splitting reasonable? Is there any repetitive logic?
• Does it comply with project specifications : for example, are the naming method, file structure, and style class names unified?

It is recommended to quickly look at the PR description before each review to confirm the purpose of the change. Don't just focus on the code itself, understand the context.

2. Use tools to help reduce human burdens

Front-end projects usually integrate tools such as ESLint, Prettier, and TypeScript, which can automatically detect most format and type problems. Instead of having the reviewer take the time to point out "a space is missing" or "variable is not declared", it is better to leave these to the machine.

You can set up the process like this:

• Automatic formatting with Husky lint-staged before submission
• Add lint checks to CI, and do not directly intercept PR merges
• For complex projects, SonarQube can be introduced for more in-depth quality analysis

After doing this, the focus of Code Review can be on more valuable places, such as architecture design, state management, performance optimization, etc.

3. Pay attention to user experience and performance impact during review

Front-end code directly affects the content and interactive experience that users see, so the following aspects cannot be ignored during review:

• Rendering performance : Are unnecessary re-rendering used? Are React.memo or useCallback reasonable in React project?
• Resource loading : Is the image compressed? Use lazy loading? Does JS make code split?
• Accessibility : Does the button have semantic labels? Does the form support keyboard operation?

For example, someone wrote onClick={() => someHeavyFunction()} in the component. When reviewing, it can be recommended to put the heavy function in the worker or perform anti-shake treatment.

4. Encourage constructive feedback and avoid imperative comments

Code Review is not only a process of "picking mistakes", but also a process of knowledge sharing. If you see a piece of code that can be optimized, you might as well say one more thing: "This logic can be considered as a hook for easy reuse", rather than simply saying "it should be refactored here".

A good review should be:

• Specifically : point out which line is problematic and explain why
• Suggestions : not only point out problems, but also give directions for improvement
• Friendly tone : Avoid "Why don't you use xxx?" to "Can we consider using xxx to simplify logic?"

This not only improves the quality of the code, but also helps team members grow together.

Basically that's it. Code Review is a detailed and detailed field. Doing well can improve the overall project quality and collaborative efficiency. If you don’t do well, it will become a battlefield of formalism or blame each other. The front-end area especially requires taking into account technical details and user experience. Don’t underestimate the code that is reviewed in every line.

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