Book: TypeScript in Production — Tooling, Build, and Library Authoring Across Runtimes

Also by me: The TypeScript Library — the 5-book collection

My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools

Me: xgabriel.com | GitHub

A team I talked to shipped a TypeScript utility library to

npm last quarter. It built. It published. The tests passed in

their monorepo. Then external users started filing issues.

One user reported that require('@team/core') returned an

empty object in Node 20. Another reported that Vitest could

not resolve the types and threw Cannot find module

'@team/core' . A third said Bun loaded the package fine but

imported the wrong file. Same package, four runtimes, four

behaviors.

That library had a main field, a module field, a types

field, and one dist directory. In 2018 that was enough. In

2026 it is the shape that produces the four-issue welcome

above.…