class SyntaxTree::LanguageServer::InlayHints::Hint

This represents a hint that is going to be displayed in the editor.

def initialize(line:, character:, label:) 

def initialize(line:, character:, label:)
  @line = line
  @character = character
  @label = label
end

def to_json(*opts)

This is the shape that the LSP expects. 
def to_json(*opts)
  {
    position: {
      line: line,
      character: character
    },
    label: label
  }.to_json(*opts)
end