title: In VS Code, how can I get JSON intellisense based on the files in a given directory?
body: <p>My application includes JSON Files. 
  One JSON property common to all JSON files in my app is "type". 
  The value of the type property must be the file name of any handlebars (.hbs) file in my /templates/ directory.<br><br>
  My goal is to get intellisense as I type the value for a given "type" property in a JSON file. The intellisense should include a list of all handlebars file names in the /templates/ directory. Either an automatic solution, or one where I provide a list of values would be great.<br><br>
  Is there a way in the VS Code config or with TypeScript to make that happen?</p>