method Worker.prototype.once
#Worker.prototype.once(event: "error",listener: (err: Error) => void,): this#Worker.prototype.once(event: "exit",listener: (exitCode: number) => void,): this#Worker.prototype.once(event: "message",listener: (value: any) => void,): this#Worker.prototype.once(event: "messageerror",listener: (error: Error) => void,): this#Worker.prototype.once(event: "online",listener: () => void,): this