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Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

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/** @typedef {"info" | "warning" | "error"} LogLevel */

/** @type {LogLevel} */
var logLevel = "info";

function dummy() {}

/**
 * @param {LogLevel} level log level
 * @returns {boolean} true, if should log
 */
function shouldLog(level) {
	var shouldLog =
		(logLevel === "info" && level === "info") ||
		(["info", "warning"].indexOf(logLevel) >= 0 && level === "warning") ||
		(["info", "warning", "error"].indexOf(logLevel) >= 0 && level === "error");
	return shouldLog;
}

/**
 * @param {(msg?: string) => void} logFn log function
 * @returns {(level: LogLevel, msg?: string) => void} function that logs when log level is sufficient
 */
function logGroup(logFn) {
	return function (level, msg) {
		if (shouldLog(level)) {
			logFn(msg);
		}
	};
}

/**
 * @param {LogLevel} level log level
 * @param {string|Error} msg message
 */
module.exports = function (level, msg) {
	if (shouldLog(level)) {
		if (level === "info") {
			console.log(msg);
		} else if (level === "warning") {
			console.warn(msg);
		} else if (level === "error") {
			console.error(msg);
		}
	}
};

var group = console.group || dummy;
var groupCollapsed = console.groupCollapsed || dummy;
var groupEnd = console.groupEnd || dummy;

module.exports.group = logGroup(group);

module.exports.groupCollapsed = logGroup(groupCollapsed);

module.exports.groupEnd = logGroup(groupEnd);

/**
 * @param {LogLevel} level log level
 */
module.exports.setLogLevel = function (level) {
	logLevel = level;
};

/**
 * @param {Error} err error
 * @returns {string} formatted error
 */
module.exports.formatError = function (err) {
	var message = err.message;
	var stack = err.stack;
	if (!stack) {
		return message;
	} else if (stack.indexOf(message) < 0) {
		return message + "\n" + stack;
	} else {
		return stack;
	}
};