Check out example codes for "There is no formatter for 'django-html' files installed.". It will help you in understanding the concepts better.

Code Example 1

{
  "beautify.language": {
    "js": {
      "type": ["javascript", "json"],
      "filename": [".jshintrc", ".jsbeautifyrc"]
      // "ext": ["js", "json"]
      // ^^ to set extensions to be beautified using the javascript beautifier
    },
    "css": ["css", "scss"],
    "html": ["htm", "html", "django-html"]
    // ^^ providing just an array sets the VS Code file type
  }
}

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