How to Fix File is not `gofumpt`-ed (gofumpt) error

gofumpt is golang linter. It’s a stricter version of gofmt.

The linter errors are hard to understand sometimes. One such error is that the File is not gofumpt-ed.

Solution

1. Install gofumpt
2. run gofumpt on the troubled files.
3. gofumpt -w <fileame>
4. If you still see an error, particularly on linter wsl, then its likely cause is an empty line at the beginning/end of a block (function, switch-case, etc)