For a full list of addressed issues, you can review the official GoLand 2018.3 Release Notes on JetBrains YouTrack. 3.x updates? GoLand 2018.3 Release Notes - JetBrains YouTrack

: Fixed a bug where "Introduce variable" could break existing code and improved receiver type completion for getters/setters.

: Enhanced TypeScript 3.1 integration, including support for mappable tuple and array types.

: Introduced the Change Signature refactoring, allowing users to modify functions and methods in a few clicks, and upgraded the Inline refactoring.

: New inspections like Unhandled Error (alerts when returned errors aren't checked) and Unreachable Code were added.

The 2018.3.1 update addressed several critical bugs found in the initial major release:

: Refined code completion for struct declarations and fixed remote debugging issues between Windows clients and Linux targets. System Requirements Operating Systems : Windows, macOS, and Linux.

: 2+ cores, 4GB+ RAM, and 5GB+ disk space recommended for performance.