TypeScript and Javascript language support for Atom-IDE
The underlying language server has been changed to the Theia IDE typescript-language-server. This resolves a number of important issues around module resolution, performance, version of TypeScript, tsconfig feature support etc.
Thanks to the Theia IDE team for their language server and @mattlyons0 for helping figure out how to use it and push the necessary required changes upstream!
Note: It is recommended that you always open the root of your project as a folder in order for the language server to correctly identify your projects tsconfig etc.