options.json

{
  "type": "object",
  "properties": {
    "limit": {
      "type": ["number"]
    },
    "mimetype": {
      "type": "string"
    },
    "fallback": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "additionalProperties": false,
          "properties": {
            "loader": {
              "description": "Fallback loader name",
              "type": "string"
            },
            "options": {
              "description": "Fallback loader options",
              "anyOf": [
                {
                  "type": "object"
                },
                {
                  "type": "string"
                }
              ]
            }
          },
          "type": "object"
        }
      ]
    }
  },
  "additionalProperties": true
}