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coc.nvim
Nodejs extension host for vim & neovim, load extensions like VSCode and host language servers.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I use coc.nvim and disable everything but omnicompletion using the following ~/vim/coc-settings and by only adding the TAB and some other navigation key maps.
I assume you refer to the whole coc eco system? There are many other LSP implementations, I have spend a bit of time trying out this one, which I find quite nice as it's written in vim9script the code is quite easy to follow. https://github.com/yegappan/lsp