Method onLogging

src/debug/dart_debug_protocol.ts:368–370

(callback: (message: string) => void)

	// TODO: This API doesn't make it obvious you can only have one subscriber.
	public onLogging(callback: (message: string) => void) {
		this.logging = callback;
	}

	public getVersion(): Promise<DebuggerResult> {
		return this.callMethod("getVersion");