DID_CHANGE
DID_CHANGE: "textDocument/didChange"
DID_CHANGE_CONFIGURATION
DID_CHANGE_CONFIGURATION: "workspace/didChangeConfiguration"
DID_OPEN
DID_OPEN: "textDocument/didOpen"
DID_SAVE
DID_SAVE: "textDocument/didSave"
INITIALIZED
INITIALIZED: "initialized"
SET_TRACE
SET_TRACE: "$/setTrace"
Client notifications