How to set cmp keyboard shortcuts correctly

[Acisama]

I am in the process of migrating my nvim config to nixvim and I love it so far.

But for cmp, the keymaps just don't seem to trigger for some reason.
I want it to start with nothing, tab and shift-tab to navigate between the suggestions and ctrl+space to select a suggestion.

My cmp.nix:

{
  enable = true;
  settings = {
    preselect = "cmp.PreselectMode.None";

    sources = [
      { name = "nvim_lsp"; }
      { name = "path"; }
      { name = "buffer"; }
      { name = "luasnip"; }
    ];

    window = {
      completion.border = "rounded";
      documentation = {
        border = "rounded";
      };
    };

    mappings = {
      "<Tab>" = "cmp.mapping.select_next_item()";
      "<S-Tab>" = "cmp.mapping.select_prev_item()";
      "<C-space>" = "cmp.mapping.confirm({ select = false })";
      "<esc>" = "cmp.mapping.abort()";
    };
  };
}

[traxys]

You need to use raw values to insert lua, for example "<Tab>".__raw = "cmp.mapping.<...>". See the documentation for some more details