TypeScript 5.8: the three changes that actually matter
Granular conditional return checking, the --erasableSyntaxOnly flag for native TS execution, and require() of ESM modules. What landed, what it…
3 min read
Read More
Appesto Engineering
Appesto Engineering
Practical articles, technical guides, tutorials, development notes, research, and insights covering software engineering and emerging technologies.
WebAssembly in 2026: when to reach for Wasm in a TypeScript stack
Wasm 3.0 is a W3C standard, WASI Preview 2 is stable, and Adobe, Figma, and Shopify run it at scale.…
3 min read
Read More
React Server Components: a practical decision framework for 2026
RSC is the default in every major React framework now. The question is no longer whether to use it -…
3 min read
Read More
How Webpack’s Hot Module Replacement actually works
HMR feels like magic - edit a file, see the change instantly, keep your component state. Here's the WebSocket-and-module-boundary mechanism…
3 min read
Read More
Bun vs Deno vs Node.js in 2026: benchmarks, trade-offs, and honest picks
Three viable JavaScript runtimes, each with a strong argument. After running all three in production, here's when we reach for…
3 min read
Read More
CSS container queries are production-ready – here’s how we use them
Responsive components that react to their container, not the viewport. Real patterns from shipping container queries across a 200-component library.
3 min read
Read More
Postgres indexing in practice: B-tree, GIN, BRIN, and when each one wins
Most slow queries aren't missing an index — they're using the wrong kind. A working tour of Postgres index types,…
3 min read
Read More
Webpack 5 asset modules: retiring file-loader, url-loader, and raw-loader
Webpack 5 built asset handling into core. Here's the asset/resource, asset/inline, and asset/source types, the parser.dataUrlCondition size threshold, and how…
2 min read
Read More
INP replaced TTI – and most teams still haven’t adjusted their metrics
Interaction to Next Paint is now a Core Web Vital. What it measures, why it's harder to game than its…
2 min read
Read More
Rate limiting that doesn’t ruin your API: token bucket, sliding window, and honest 429s
Every public API needs rate limiting; most implementations punish legitimate users. The algorithms compared, where to enforce them, and how…
3 min read
Read More