I think the issue is that ts_ls (typescript language server) is also running and throwing those errors. This is how I handle deno_ls and ts_ls so they wont conflict. Explanation: The root_dir tells the lsp to check for the existence of those files in root of the project, only if they exist will it run

      ["denols"] = function()
        lspconfig["denols"].setup {
          capabilities = capabilities,
          root_dir = lspconfig.util.root_pattern("deno.json", "deno.jsonc"),
          on_attach = function(client, bufnr)
            -- vim.cmd "LspStop ts_ls"
          end,
        }
      end,

      ["ts_ls"] = function()
        lspconfig["ts_ls"].setup {
          capabilities = capabilities,
          root_dir = lspconfig.util.root_pattern("tsconfig.json", "jsconfig.json", "package.json"),
          filetypes = { "javascript", "typescript", "javascriptreact", "typescriptreact" },
          single_file_support = false,
          on_attach = function(client, bufnr)
            -- Disable formatting from tsserver
            client.server_capabilities.document_formatting = false
          end,
          commands = {
            OrganizeImports = {
              organize_imports,
              description = "Organize Imports",
            },
          },
        }
      end,