{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "textDocument/completion",
  "params": {
    "textDocument": {
      "uri": "file:///a/file.ts"
    },
    "position": {
      "line": 0,
      "character": 5
    },
    "context": {
      "triggerKind": 2,
      "triggerCharacter": "."
    }
  }
}