Comment by DerJacques

Could it be that you were using type-aware linting rules? If you have these rules enabled, ESLint basically has to compile all your TS files to check if the rules are followed. Note that most of the ESLint rules are _not_ type aware, but following the setup guides quickly has you turning them on “by accident”. For more details, see: https://github.com/typescript-eslint/typescript-eslint/blob/...