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Configuring GoLand for WebAssembly (Wasm) projects
Initial project configuration
When you first open or start a WebAssembly project in GoLand, it won't understand the "syscall/js" package.
That's easily fixable, by changing the GOOS and GOARCH values in the project settings, as per the screenshots below.
Note - The screenshot below shows how to access Settings on a Linux desktop. If you're using macOS, you'll probably need to access them through the standard macOS Preferences option. 
Configuring Run/Debug settings
With the initial project settings changed, you'll probably want to configure the Run/Debug settings next.
That will let you recompile the .wasm file by just launching Run (Shift+F10 on Linux).
Finished, your GoLand setup should now be complete.