-export type Draft<T> = { -readonly [P in keyof T]?: T[P] }
+import type { EventLoopUtilization } from 'node:perf_hooks'
+import type { MessagePort, TransferListItem } from 'node:worker_threads'
+import type { KillBehavior } from './worker/worker-options'
-export interface MessageValue<Data> {
+/**
+ * Task error.
+ *
+ * @typeParam Data - Type of data sent to the worker triggering an error. This can only be structured-cloneable data.
+ */
+export interface TaskError<Data = unknown> {
+ /**
+ * Task name triggering the error.
+ */
+ readonly name: string
+ /**
+ * Error message.
+ */
+ readonly message: string
+ /**
+ * Data triggering the error.
+ */
readonly data?: Data
- readonly id?: number
- readonly kill?: number
- readonly error?: string
- readonly parent?: MessagePort
}
+
+/**
+ * Task performance.
+ *
+ * @internal
+ */
+export interface TaskPerformance {
+ /**
+ * Task name.
+ */
+ readonly name: string
+ /**
+ * Task performance timestamp.
+ */
+ readonly timestamp: number
+ /**
+ * Task runtime.
+ */
+ readonly runTime?: number
+ /**
+ * Task event loop utilization.
+ */
+ readonly elu?: EventLoopUtilization
+}
+
+/**
+ * Performance statistics computation.
+ *
+ * @internal
+ */
+export interface WorkerStatistics {
+ runTime: boolean
+ elu: boolean
+}
+
+/**
+ * Message object that is passed as a task between main worker and worker.
+ *
+ * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
+ * @internal
+ */
+export interface Task<Data = unknown> {
+ /**
+ * Worker id.
+ */
+ readonly workerId: number
+ /**
+ * Task name.
+ */
+ readonly name?: string
+ /**
+ * Task input data that will be passed to the worker.
+ */
+ readonly data?: Data
+ /**
+ * Array of transferable objects.
+ */
+ readonly transferList?: TransferListItem[]
+ /**
+ * Timestamp.
+ */
+ readonly timestamp?: number
+ /**
+ * Task UUID.
+ */
+ readonly taskId?: string
+}
+
+/**
+ * Message object that is passed between main worker and worker.
+ *
+ * @typeParam Data - Type of data sent to the worker or execution response. This can only be structured-cloneable data.
+ * @typeParam ErrorData - Type of data sent to the worker triggering an error. This can only be structured-cloneable data.
+ * @internal
+ */
+export interface MessageValue<Data = unknown, ErrorData = unknown>
+ extends Task<Data> {
+ /**
+ * Kill code.
+ */
+ readonly kill?: KillBehavior | true | 'success' | 'failure'
+ /**
+ * Task error.
+ */
+ readonly taskError?: TaskError<ErrorData>
+ /**
+ * Task performance.
+ */
+ readonly taskPerformance?: TaskPerformance
+ /**
+ * Task function names.
+ */
+ readonly taskFunctions?: string[]
+ /**
+ * Whether the worker computes the given statistics or not.
+ */
+ readonly statistics?: WorkerStatistics
+ /**
+ * Whether the worker is ready or not.
+ */
+ readonly ready?: boolean
+ /**
+ * Whether the worker starts or stops its activity check.
+ */
+ readonly checkActive?: boolean
+ /**
+ * Message port.
+ */
+ readonly port?: MessagePort
+}
+
+/**
+ * An object holding the task execution response promise resolve/reject callbacks.
+ *
+ * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
+ * @internal
+ */
+export interface PromiseResponseWrapper<Response = unknown> {
+ /**
+ * Resolve callback to fulfill the promise.
+ */
+ readonly resolve: (value: Response | PromiseLike<Response>) => void
+ /**
+ * Reject callback to reject the promise.
+ */
+ readonly reject: (reason?: unknown) => void
+ /**
+ * The worker node key executing the task.
+ */
+ readonly workerNodeKey: number
+}
+
+export type Writable<T> = { -readonly [P in keyof T]: T[P] }