require(esm) in Node.js
Recently I landed experimental support for require()-ing synchronous ES modules in Node.js, a feature that has been long overdue. In the pull request, I commented with my understanding about why it did not happen sooner before this pull request in 2024. This post expands on that comment a bit more. The opinions in this post are my own and reflect my perception of the ESM development in Node.js as
Memory leak regression testing with V8/Node.js, part 1 - memory usage-based testing
Memory leak regression testing with V8/Node.js, part 1 - memory usage-based testing Like many other relatively big piece of software, Node.js is no stranger to memory leaks, and with them, fixes and regression tests. Testing against memory leak regressions, however, can be particularly tricky in a runtime with a garbage-collected heap, and quite a few of these tests became source of flakes in the
How does Node.js load its built-in/native modules?
This post stems from a recent Twitter conversation and a bug I was trying to fix. I’ve also seen some questions asked in the issue tracker about this from time to time. A lot of people are already aware that a substantial part of Node.js is implemented in JavaScript, and many naturally think that Node.js loads its builtins from separate JS files on disk when the process is launched (which is very
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