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

{
  "jsonrpc": "2.0",
  "method": "textDocument/didChange",
  "params": {
    "textDocument": {
      "uri": "file:///a/file.ts",
      "version": 2
    },
    "contentChanges": [
      {
        "range": {
          "start": {
            "line": 9,
            "character": 4
          },
          "end": {
            "line": 9,
            "character": 4
          }
        },
        "text": "123, "
      }
    ]
  }
}