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The plugin responsible for that is nvim-lspconfig
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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nvim-lspconfig is only for configuring the language-servers. You need to add the https://github.com/hrsh7th/cmp-nvim-lsp source to nvim-cmp in order to get lsp completions
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Check out lsp-zero.nvim which does exactly that
NOTE:
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Hence, a higher number means a more popular project.