Interview Q&A / Node.js
Node.js interview questions
The event loop on the server, streams, modules and building APIs with Express.
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- How can CommonJS code load an ES module?
Use dynamic import(), which works in CommonJS and returns a promise. Plain require of an ES module was not allowed historically; newer Node versions added limited support, so dynamic import is the safe choice.
IntermediateQuick answer1 min read - What is a circular dependency in Node.js and what happens when it occurs?
A circular dependency is when module A requires B and B requires A. In CommonJS, the second module receives A's partially filled exports at that moment, so values defined later are undefined. Fix it by restructuring.
IntermediateQuick answer1 min read