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MessagePort

The MessagePort interface of the Channel Messaging API represents one of the two ports of a MessageChannel, allowing messages to be sent from one port and listening out for them arriving at the other.

class MessagePort extends EventTarget {
onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null;
onmessageerror: ((this: MessagePort, ev: MessageEvent) => any) | null;
addEventListener<K extends keyof MessagePortEventMap>(
type: K,
listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any,
options?: boolean | AddEventListenerOptions,
): void;
addEventListener(
type: string,
options?: boolean | AddEventListenerOptions,
): void;
close(): void;
postMessage(message: any, transfer: Transferable[]): void;
postMessage(message: any, options?: StructuredSerializeOptions): void;
removeEventListener<K extends keyof MessagePortEventMap>(
type: K,
listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any,
options?: boolean | EventListenerOptions,
): void;
removeEventListener(
type: string,
options?: boolean | EventListenerOptions,
): void;
start(): void;
}

Extends

EventTarget

Properties

onmessage: ((this: MessagePort, ev: MessageEvent) => any) | null
onmessageerror: ((this: MessagePort, ev: MessageEvent) => any) | null

Methods

addEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void
addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void
close(): void

Disconnects the port, so that it is no longer active.

postMessage(message: any, transfer: Transferable[]): void

Posts a message through the channel. Objects listed in transfer are transferred, not just cloned, meaning that they are no longer usable on the sending side.

Throws a "DataCloneError" DOMException if transfer contains duplicate objects or port, or if message could not be cloned.

postMessage(message: any, options?: StructuredSerializeOptions): void
removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void
removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void
start(): void

Begins dispatching messages received on the port. This is implictly called when assiging a value to this.onmessage.

© 2018–2021 the Deno authors
https://doc.deno.land/deno/stable/~/MessagePort