How do you configure Webpack in Next.js?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of Next.js conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
By adding a custom webpack configuration in next.config.js.
module.exports = {
webpack: (
config,
{ buildId, dev, isServer, defaultLoaders, webpack }
) => {
// Note: we provide webpack above so you should not `require` it
// Perform customizations to webpack config
config.plugins.push(new webpack.IgnorePlugin(/\/__tests__\//));
// Important: return the modified config
return config;
},
};
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.