app/frontend/node_modules/mdn-data/css/syntaxes.schema.json

{
  "type": "object",
  "additionalProperties": {
    "type": "object",
    "additionalProperties": false,
    "required": [
      "syntax"
    ],
    "properties": {
      "syntax": {
        "type": "string"
      }
    }
  }
}