src/vs/workbench/api/common/extHostOutput.ts/ExtHostOutputChannel/constructor
class ExtHostOutputChannel:	constructor(
		readonly id: string, readonly name: string,
		protected readonly logger: ILogger,
		protected readonly proxy: MainThreadOutputServiceShape,
		readonly extension: IExtensionDescription,
	) {
		super();
		this.setLevel(logger.getLevel());
		this._register(logger.onDidChangeLogLevel(level => this.setLevel(level)));
	}