denoland-deno/cli/tests/lsp/signature_help_request_02.json

{
  "id": 2,
  "jsonrpc": "2.0",
  "method": "textDocument/signatureHelp",
  "params": {
    "textDocument": {
      "uri": "file:///a/file.ts"
    },
    "position": {
      "character": 8,
      "line": 9
    }
  }
}