Should I mix require and import in the same Node.js project?
No. Pick one module system per project. Using require in an ES module file or import in a CommonJS file causes errors. If you must mix systems, use dynamic import() to load ES modules from CommonJS.
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More FAQs in Common Module Mistakes in Node.js That Cause Bugs
Because you mixed exports.add and module.exports = in the same file. exports is a reference to module.exports initially, but reassigning module.exports breaks the link. Pick one approach per file to avoid this bug.
When file A requires B and B requires A. Node.js handles this by returning a partially loaded module, which can cause confusing bugs. Avoid circular dependencies by restructuring your code so the dependency goes one way.
Because modules are cached after their first require. The file's code runs once, and the same object is returned on subsequent requires. Export a factory function if you need fresh state on each require.
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