Oleh Volynets

feat(diagnostic): allow custom diagnostic format in statusline

8

Problem: Statusline component of diagnostics allows only the default format "sign:count". Solution: Extend vim.diagnostic.Opts.Status to allow a custom formatting function.

Replace `mutable` modifier with `readonly`

2

ZLS 0.15 added non-standard `mutable` modifier for variables which is a great feature. However for better integration with various tools it's better to use the standard `readonly` modifier on constants....