src/vs/platform/log/node/spdlogLog.ts/SpdLogLogger/constructor
class SpdLogLogger:	constructor(
		private readonly name: string,
		private readonly filepath: string,
		private readonly rotating: boolean,
		level: LogLevel
	) {
		super();
		this.setLevel(level);
		this._loggerCreationPromise = this._createSpdLogLogger();
		this._register(this.onDidChangeLogLevel(level => {
			if (this._logger) {
				this._logger.setLevel(level);
			}
		}));
	}