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 picks up Effect because the README sells the dream: typed errors in the function signature, retries as values you compose, structured concurrency that cancels child work when the parent dies, and a dependency-injection story that is not an inversify decorator soup. Two sprints in, the PR turnaround has doubled. The engineer who pushed for it ends up answering "what does Effect<A, E, R> mean again?" on review after review. The dream is real. The cost is also real. Effect is one of the most actively developed functional-effects systems in TypeScript today (the stable line sits in the 3.x series at the time of writing, with v4 in development — check the npm page for current). It earns its keep on a narrow set of problems.…