I wasn't aware of the treesitter API change, this change indeed fixes the issue. Thanks!

Thank you a lot @philwhln !
I applied this locally and it gets the job done. It would be lovely to have this PR merged - it will save people some nerves ;)

Thank you @philwhln helped me alot

I think we can simply delete the line since Lazy defaults to require("plugin").config if main is not specified.
That is, if the repository becomes maintained again and PRs get merged...

• Edit: I have been using the master branch so I was not aware, but nvim-treesitter did a major rewrite (essentially reduced to a paerser installer) last December and now directs to Neovim's vim.treesitter module for utilizing any of the Treesitter features. So changing configs to config (or deleting that line altogether) will eliminate the error, but it will not enable treesitter.
  If you are like me and just use the Treesitter for highlighting, use the following config:

return {
  "nvim-treesitter/nvim-treesitter",
  lazy = false,
  build = ":TSUpdate",
  config = function()
    require("nvim-treesitter").setup()

    -- Find the name of parsers with:
    --  := require("nvim-treesitter").get_available()
    -- (LaTeX clashes with Vimtex)
    local languages = { "bash",
      "c", "cpp", "fish", "html", "java", "javascript", "lua", "markdown", "markdown_inline",
      "python", "sql", "vimscript", "vimdoc" }

    local filetypes = {}
    for _, lang in ipairs(languages) do
      for _, ft in ipairs(vim.treesitter.language.get_filetypes(lang)) do
        table.insert(filetypes, ft)
      end
    end

    vim.api.nvim_create_autocmd("FileType", {
      pattern = filetypes,
      callback = function()
        vim.treesitter.start()
        vim.wo[0][0].foldexpr = "v:lua.vim.treesitter.foldexpr()"
        vim.wo[0][0].foldmethod = "expr"
        -- Indentation is Experimental
        -- vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
      end,
    })
  end
}

If you need textobject support or other treesitter features, you now need a separate plugin (e.g., https://github.com/nvim-treesitter/nvim-treesitter-textobjects)

Thanks, i did something similar to this - i didn't include everything in here. Let me know if somethign is missing badly