Interface Subscription (4.0.7)

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on(event: 'message', listener: (message: Message) => void): this;

on(event: 'error', listener: (error: StatusError) => void): this;

on(event: 'close', listener: () => void): this;

on(event: 'debug', listener: (msg: DebugMessage) => void): this;

on(event: 'newListener', listener: (event: string | symbol, listener: Function) => void): this;

on(event: 'removeListener', listener: (event: string | symbol, listener: Function) => void): this;

on(event: string, listener: void): this;