nstdlib-nightly/lib/internal/per_context/messageport.mjs

Node.js standard library converted to runtime-agnostic ES modules.

// Source: https://github.com/nodejs/node/blob/65eff1eb/lib/internal/per_context/messageport.js

class MessageEvent {
  constructor(data, target, type, ports) {
    this.data = data;
    this.target = target;
    this.type = type;
    this.ports = ports ?? [];
  }
}

const kHybridDispatch = Symbol.for("nodejs.internal.kHybridDispatch");
const kCurrentlyReceivingPorts = Symbol.for(
  "nodejs.internal.kCurrentlyReceivingPorts",
);

const _export_emitMessage_ = function (data, ports, type) {
  if (typeof this[kHybridDispatch] === "function") {
    this[kCurrentlyReceivingPorts] = ports;
    try {
      this[kHybridDispatch](data, type, undefined);
    } finally {
      this[kCurrentlyReceivingPorts] = undefined;
    }
    return;
  }

  const event = new MessageEvent(data, this, type, ports);
  if (type === "message") {
    if (typeof this.onmessage === "function") this.onmessage(event);
  } else {
    // eslint-disable-next-line no-lonely-if
    if (typeof this.onmessageerror === "function") this.onmessageerror(event);
  }
};
export { _export_emitMessage_ as emitMessage };