my TS project is slow to build. now what?

1. use project references https://react-typescript-cheatsheet.netlify.app/docs/advanced/patterns_by_version#typescript-30
2. use --incremental
3. yarn tsd --diagnostics to get a sense
4. TypeScript team performance documentation - https://github.com/microsoft/TypeScript/wiki/Performance
5. TypeScript Performance tracing (4.1+ only) - https://github.com/microsoft/TypeScript/wiki/Performance-Tracing

• https://medium.com/pixel-and-ink/understanding-and-improving-emotion-10s-typescript-types-622e2d172f6f