export type Draft<T> = { -readonly [P in keyof T]?: T[P] }
-export interface MessageValue<Data> {
+export type JSONPrimitive = number | boolean | string | null
+// eslint-disable-next-line no-use-before-define
+export type JSONValue = JSONPrimitive | JSONArray | JSONObject
+export type JSONObject = { [k: string]: JSONValue }
+export type JSONArray = Array<JSONValue>
+
+export interface MessageValue<Data = unknown> {
readonly data?: Data
readonly id?: number
readonly kill?: number