Where should I start reading the Node.js source?
The README and contributing guide for the mental model, then the lib directory. Start with a small, self-contained module like events, which is educational and approachable, before tackling larger modules like fs or http.
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More FAQs in A Roadmap to Explore the Node.js Source Code as a Developer
In order: read the README and contributing guide, explore the lib directory for JavaScript implementations, read tests for one module, trace one feature deeply from JavaScript to C++ bindings, explore the deps for V8 and libuv, follow issues and PRs, and try a small contribution.
Because one feature, traced deeply from JavaScript in lib through to C++ bindings in src, teaches more than ten features skimmed. Deep understanding of one path builds the mental model for understanding the rest.
To understand how V8 and libuv are bundled and integrated. You do not need to read them fully, but understanding their role is key to understanding why Node.js works the way it does.
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