+ /**
+ * Runtime.
+ */
+ readonly runTime?: number
+ /**
+ * Reference to main worker.
+ */
+ readonly parent?: MainWorker
+}
+
+/**
+ * Worker synchronous function that can be executed.
+ *
+ * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
+ * @typeParam Response - Type of execution response. This can only be serializable data.
+ */
+export type WorkerSyncFunction<Data = unknown, Response = unknown> = (
+ data?: Data
+) => Response
+
+/**
+ * Worker asynchronous function that can be executed.
+ * This function must return a promise.
+ *
+ * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
+ * @typeParam Response - Type of execution response. This can only be serializable data.
+ */
+export type WorkerAsyncFunction<Data = unknown, Response = unknown> = (
+ data?: Data
+) => Promise<Response>
+
+/**
+ * Worker function that can be executed.
+ * This function can be synchronous or asynchronous.
+ *
+ * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
+ * @typeParam Response - Type of execution response. This can only be serializable data.
+ */
+export type WorkerFunction<Data = unknown, Response = unknown> =
+ | WorkerSyncFunction<Data, Response>
+ | WorkerAsyncFunction<Data, Response>
+
+/**
+ * Worker functions that can be executed.
+ * This object can contain synchronous or asynchronous functions.
+ * The key is the name of the function.
+ * The value is the function itself.
+ *
+ * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
+ * @typeParam Response - Type of execution response. This can only be serializable data.
+ */
+export type TaskFunctions<Data = unknown, Response = unknown> = Record<
+string,
+WorkerFunction<Data, Response>
+>
+
+/**
+ * An object holding the execution response promise resolve/reject callbacks.
+ *
+ * @typeParam Worker - Type of worker.
+ * @typeParam Response - Type of execution response. This can only be serializable data.
+ * @internal
+ */
+export interface PromiseResponseWrapper<
+ Worker extends IWorker,
+ Response = unknown
+> {
+ /**
+ * Resolve callback to fulfill the promise.
+ */
+ readonly resolve: (value: Response) => void
+ /**
+ * Reject callback to reject the promise.
+ */
+ readonly reject: (reason?: string) => void
+ /**
+ * The worker handling the execution.
+ */
+ readonly worker: Worker