Basic logging interface.

Log.ts

export interface Logger {
	Log(...args: any[]): void;
	Info(...args: any[]): void;
	Error(...args: any[]): void;
}

export enum LogLevel {
	None = 0,

	Log = 1 << 0,
	Info = 1 << 1,
	Error = 1 << 2,

	All = LogLevel.Log | LogLevel.Info | LogLevel.Error,
}

export function NewMultiLogger(
	logLevel: LogLevel,
	...loggers: Logger[]
): Logger {
	let manager: Logger = Object.create(null);

	const createLogger = (type: keyof Logger) => (...args: any[]) => {
		if ((logLevel & LogLevel[type]) === 0) {
			return;
		}

		let l: Logger;
		for (l of loggers) {
			l[type](...args);
		}
	};

	let methods: Array<keyof Logger> = ["Log", "Info", "Error"];
	for (let m of methods) {
		manager[m] = createLogger(m);
	}

	return manager;
}