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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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/* global __resourceQuery */

"use strict";

if (typeof EventSource !== "function") {
	throw new Error(
		"Environment doesn't support lazy compilation (requires EventSource)"
	);
}

var urlBase = decodeURIComponent(__resourceQuery.slice(1));
/** @type {EventSource | undefined} */
var activeEventSource;
var activeKeys = new Map();
var errorHandlers = new Set();

var updateEventSource = function updateEventSource() {
	if (activeEventSource) activeEventSource.close();
	if (activeKeys.size) {
		activeEventSource = new EventSource(
			urlBase + Array.from(activeKeys.keys()).join("@")
		);
		/**
		 * @this {EventSource}
		 * @param {Event & { message?: string, filename?: string, lineno?: number, colno?: number, error?: Error }} event event
		 */
		activeEventSource.onerror = function (event) {
			errorHandlers.forEach(function (onError) {
				onError(
					new Error(
						"Problem communicating active modules to the server: " +
							event.message +
							" " +
							event.filename +
							":" +
							event.lineno +
							":" +
							event.colno +
							" " +
							event.error
					)
				);
			});
		};
	} else {
		activeEventSource = undefined;
	}
};

/**
 * @param {{ data: string, onError: (err: Error) => void, active: boolean, module: module }} options options
 * @returns {() => void} function to destroy response
 */
exports.keepAlive = function (options) {
	var data = options.data;
	var onError = options.onError;
	var active = options.active;
	var module = options.module;
	errorHandlers.add(onError);
	var value = activeKeys.get(data) || 0;
	activeKeys.set(data, value + 1);
	if (value === 0) {
		updateEventSource();
	}
	if (!active && !module.hot) {
		console.log(
			"Hot Module Replacement is not enabled. Waiting for process restart..."
		);
	}

	return function () {
		errorHandlers.delete(onError);
		setTimeout(function () {
			var value = activeKeys.get(data);
			if (value === 1) {
				activeKeys.delete(data);
				updateEventSource();
			} else {
				activeKeys.set(data, value - 1);
			}
		}, 1000);
	};
};