+import type { Worker } from 'cluster'
+import type { MessagePort } from 'worker_threads'
+import type { KillBehavior } from './worker/worker-options'
+
+/**
+ * Make all properties in T non-readonly.
+ */
export type Draft<T> = { -readonly [P in keyof T]?: T[P] }
+/**
+ * Serializable primitive JSON value.
+ */
export type JSONPrimitive = number | boolean | string | null
+/**
+ * Serializable JSON value.
+ */
// eslint-disable-next-line no-use-before-define
export type JSONValue = JSONPrimitive | JSONArray | JSONObject
+/**
+ * Serializable JSON object.
+ */
export type JSONObject = { [k: string]: JSONValue }
+/**
+ * Serializable JSON array.
+ */
export type JSONArray = Array<JSONValue>
-export interface MessageValue<Data = unknown> {
+/**
+ * Message object that is passed between worker and main worker.
+ */
+export interface MessageValue<
+ Data = unknown,
+ MainWorker extends Worker | MessagePort | unknown = unknown
+> {
+ /**
+ * Input data that will be passed to the worker.
+ */
readonly data?: Data
+ /**
+ * ID of the message.
+ */
readonly id?: number
- readonly kill?: number
+ /**
+ * Kill code.
+ */
+ readonly kill?: KillBehavior | 1
+ /**
+ * Error.
+ */
readonly error?: string
- readonly parent?: MessagePort
+ /**
+ * Reference to main worker.
+ *
+ * _Only for internal use_
+ */
+ readonly parent?: MainWorker
}