{
  "additionalProperties": false,
  "type": "object",
  "properties": {
    "server": {
      "additionalProperties": false,
      "type": "object",
      "properties": {
        "listen": {
          "additionalProperties": false,
          "type": "object",
          "properties": {
            "host": {
              "type": "string"
            },
            "port": {
              "anyOf": [
                {
                  "maximum": 65535,
                  "minimum": 0,
                  "type": "integer"
                },
                {
                  "pattern": "^\\$\\{[^}]+\\}$",
                  "type": "string"
                }
              ]
            }
          }
        }
      }
    },
    "variables": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z_][a-zA-Z0-9_]*$": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "number"
            },
            {
              "type": "boolean"
            }
          ]
        }
      }
    }
  },
  "$id": "https://app.local/config.schema.json",
  "$schema": "http://json-schema.org/draft-07/schema#"
}