completion-nvim VS lua-language-server

I think it can be on any lua file. Plus I checked completion.nvim is now on archived.

You don't, nvim-cmp sets up you. Jokes aside, I am using completion-nvim. Unfortunately it got abandoned just as Neovim 0.5.1 got released, which contained a breaking change. You can look into the pending PRs to see how to fix it for yourself, just use one of the fixed forks. It really sucks, but unless someone steps up an creates a new completion plugin that's what I am stuck with.

I couldn't figure out how to change this. I found some options, some of which made an entire split window appear above... that's hideous. I also found this, but that works with lua. How do I even set up these lua scripts? I don't get it. Can I get some guidance? Thanks.

I have tried to move to nvim-cmp since completion-nvim is dead, but for the life of me I cannot figure out how to make it not automatically select the first completion candidate. If I type date and hit to insert a new line, cmp takes as the "confirm selection" key (because I have mapped it that way) and expands the snippet. I only want to confirm a selection if I actually selected something from the menu. completion-nvim may be dead, but at least its author had the courtesy to write down how to use it in complete plain English sentences instead of broken English one-liners. Eventually I gave up and moved back to the old setup.

That will give you the basics, you should see linter diagnostics and auto omin completion should work. For better auto-completion and snippets you can set up one of the completion- and snippets plugins. Personally I use completion-nvim and Ultisnips. There may be better plugins out there, that's just what I happen to have installed.

I recently upgraded from Neovim 0.5.0 to 0.5.1 and LSP autocompletion stopped working. I'm using https://github.com/nvim-lua/completion-nvim but it looks like its maintenance could be much better. I'm looking for some alternative but I'm not sure what would be a good choice for LSP. Any recommendations?

I'm trying to configure completion-nvim with Neovim's LSP, but am not getting any sort of pop-up/display.

Check the documentation of lua_ls

You can use LLS extension for VSCode. Documentation: https://github.com/LuaLS/lua-language-server/wiki/Annotations

There's lua-language-server which works with types defined in definition files and/or annotations in comments.

Lastly, neovim now supports semantic token highlighting which uses semantic tokens from LSP servers to provide even better, language specific highlighting. Some LSP servers support semantic tokens for doc comments. The lua language server is a good example. Unfortunately, if you're using a language like C or C++, the language servers do not provide semantic tokens for comments because doxygen style comments are not specific to those languages so you might be out of luck for semantic token highlighting.

I think it is because the language server send a different type for the first line: https://github.com/LuaLS/lua-language-server/blob/eeffd1462b892fda5d01282acf840ba0e154e467/script/core/hover/label.lua (might be one of the other files here, not label)

And I was reading this installation guide and after "./bin/lua-language-server " I get this in terminal

Not sure about typescript but there is a jsdoc equivalent: https://github.com/LuaLS/lua-language-server/wiki/Annotations

Lua with lua-language-server and annotated types is a much nicer experience.

For it to be language-aware (like provide suggestions for module/table/class methods/fields) you also need language server (like lua_ls for Lua). But even without it you should see suggestions from fallback method. If you don't, then 'mini.completion' is not installed and/or activated.

I also want to thank current & past GitHub sponsors who help finance costs associated with the plugin. I regularly pay the surplus forward to other devs whose tooling I heavily rely on (huge shout-out to sumneko for working on the Lua language server, without it a plugin of the complexity of mason.nvim would be impossible, go sponsor them here).