Type Alias: JsonValue

type JsonValue = 
  | string
  | number
  | boolean
  | null
  | JsonValue[]
  | {
[key: string]: JsonValue;
};

A value that can be represented in JSON: a string, number, boolean, null, array, or object. Component state uses these values so it can be sent through iframe messages and encoded in URLs. Dates are ISO 8601 strings; functions and undefined are not supported.