Is tsserver and eslint_d redundant?

[zer09]

Do I still need to enable tsserver on nvim-lspconfig if I already have null_ls.builtins.diagnostics.eslint_d enabled?

[jose-elias-alvarez]

This isn't really null-ls related, but yes, these are two different things. tsserver is a full-fledged language server that will provide TypeScript diagnostics and other features based on your project. ESLint is a more local linter that checks the current file for errors, but it's generally not aware of type issues / issues beyond the current file. For most TypeScript projects, you'll want to use both, and you may want to consider using the ESLint language server instead of null-ls.