[
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "textDocument/didOpen",
  "params": {
     "textDocument": {
       "uri":">>> file_uri('sample.php')",
       "languageId": "hack",
       "version":1,
       "text":">>> read_file('sample.php')"
     }
   }
}
]
