I ported markdownlint-cli2 to Rust and matched 264,114 diagnostics on this blog repository byte for byte. The commits that ported 51 rules landed in a single day, but turning that into a tool you could actually swap in took two weeks. A record of giving up a parser 37 times faster, correcting two performance misreadings, and finding 11 more compatibility differences in an adversarial review.
In a Next.js 16 Turbopack production build, a module-scope singleton became two live instances at runtime. Inside the same synchronous block, one condition contradicted the other, and responses that arrived in 30ms still timed out. This is the record of tracing the cause through the bundle output: a partial scope hoisting merge, a circular import, an upstream bug that had already been fixed, and the single-variable experiment I ran too late.
Module boundaries created by a single line of 'use client', build-time transformations, Flight serialization, and performance implications
What happens behind a single line of "use server"?
A deep exploration of how React Compiler analyzes code and what it produces, from pipeline to final output.
A comprehensive guide covering AST concepts, parsing process, key node types, and practical usage in tools like Babel and ESLint.
