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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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/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

var $installedChunks$ = undefined;
var $loadUpdateChunk$ = undefined;
var $moduleCache$ = undefined;
var $moduleFactories$ = undefined;
var $ensureChunkHandlers$ = undefined;
var $hasOwnProperty$ = undefined;
var $hmrModuleData$ = undefined;
var $hmrDownloadUpdateHandlers$ = undefined;
var $hmrInvalidateModuleHandlers$ = undefined;
var __webpack_require__ = undefined;

module.exports = function () {
	var currentUpdateChunks;
	var currentUpdate;
	var currentUpdateRemovedChunks;
	var currentUpdateRuntime;
	function applyHandler(options) {
		if ($ensureChunkHandlers$) delete $ensureChunkHandlers$.$key$Hmr;
		currentUpdateChunks = undefined;
		function getAffectedModuleEffects(updateModuleId) {
			var outdatedModules = [updateModuleId];
			var outdatedDependencies = {};

			var queue = outdatedModules.map(function (id) {
				return {
					chain: [id],
					id: id
				};
			});
			while (queue.length > 0) {
				var queueItem = queue.pop();
				var moduleId = queueItem.id;
				var chain = queueItem.chain;
				var module = $moduleCache$[moduleId];
				if (
					!module ||
					(module.hot._selfAccepted && !module.hot._selfInvalidated)
				)
					continue;
				if (module.hot._selfDeclined) {
					return {
						type: "self-declined",
						chain: chain,
						moduleId: moduleId
					};
				}
				if (module.hot._main) {
					return {
						type: "unaccepted",
						chain: chain,
						moduleId: moduleId
					};
				}
				for (var i = 0; i < module.parents.length; i++) {
					var parentId = module.parents[i];
					var parent = $moduleCache$[parentId];
					if (!parent) continue;
					if (parent.hot._declinedDependencies[moduleId]) {
						return {
							type: "declined",
							chain: chain.concat([parentId]),
							moduleId: moduleId,
							parentId: parentId
						};
					}
					if (outdatedModules.indexOf(parentId) !== -1) continue;
					if (parent.hot._acceptedDependencies[moduleId]) {
						if (!outdatedDependencies[parentId])
							outdatedDependencies[parentId] = [];
						addAllToSet(outdatedDependencies[parentId], [moduleId]);
						continue;
					}
					delete outdatedDependencies[parentId];
					outdatedModules.push(parentId);
					queue.push({
						chain: chain.concat([parentId]),
						id: parentId
					});
				}
			}

			return {
				type: "accepted",
				moduleId: updateModuleId,
				outdatedModules: outdatedModules,
				outdatedDependencies: outdatedDependencies
			};
		}

		function addAllToSet(a, b) {
			for (var i = 0; i < b.length; i++) {
				var item = b[i];
				if (a.indexOf(item) === -1) a.push(item);
			}
		}

		// at begin all updates modules are outdated
		// the "outdated" status can propagate to parents if they don't accept the children
		var outdatedDependencies = {};
		var outdatedModules = [];
		var appliedUpdate = {};

		var warnUnexpectedRequire = function warnUnexpectedRequire(module) {
			console.warn(
				"[HMR] unexpected require(" + module.id + ") to disposed module"
			);
		};

		for (var moduleId in currentUpdate) {
			if ($hasOwnProperty$(currentUpdate, moduleId)) {
				var newModuleFactory = currentUpdate[moduleId];
				/** @type {TODO} */
				var result;
				if (newModuleFactory) {
					result = getAffectedModuleEffects(moduleId);
				} else {
					result = {
						type: "disposed",
						moduleId: moduleId
					};
				}
				/** @type {Error|false} */
				var abortError = false;
				var doApply = false;
				var doDispose = false;
				var chainInfo = "";
				if (result.chain) {
					chainInfo = "\nUpdate propagation: " + result.chain.join(" -> ");
				}
				switch (result.type) {
					case "self-declined":
						if (options.onDeclined) options.onDeclined(result);
						if (!options.ignoreDeclined)
							abortError = new Error(
								"Aborted because of self decline: " +
									result.moduleId +
									chainInfo
							);
						break;
					case "declined":
						if (options.onDeclined) options.onDeclined(result);
						if (!options.ignoreDeclined)
							abortError = new Error(
								"Aborted because of declined dependency: " +
									result.moduleId +
									" in " +
									result.parentId +
									chainInfo
							);
						break;
					case "unaccepted":
						if (options.onUnaccepted) options.onUnaccepted(result);
						if (!options.ignoreUnaccepted)
							abortError = new Error(
								"Aborted because " + moduleId + " is not accepted" + chainInfo
							);
						break;
					case "accepted":
						if (options.onAccepted) options.onAccepted(result);
						doApply = true;
						break;
					case "disposed":
						if (options.onDisposed) options.onDisposed(result);
						doDispose = true;
						break;
					default:
						throw new Error("Unexception type " + result.type);
				}
				if (abortError) {
					return {
						error: abortError
					};
				}
				if (doApply) {
					appliedUpdate[moduleId] = newModuleFactory;
					addAllToSet(outdatedModules, result.outdatedModules);
					for (moduleId in result.outdatedDependencies) {
						if ($hasOwnProperty$(result.outdatedDependencies, moduleId)) {
							if (!outdatedDependencies[moduleId])
								outdatedDependencies[moduleId] = [];
							addAllToSet(
								outdatedDependencies[moduleId],
								result.outdatedDependencies[moduleId]
							);
						}
					}
				}
				if (doDispose) {
					addAllToSet(outdatedModules, [result.moduleId]);
					appliedUpdate[moduleId] = warnUnexpectedRequire;
				}
			}
		}
		currentUpdate = undefined;

		// Store self accepted outdated modules to require them later by the module system
		var outdatedSelfAcceptedModules = [];
		for (var j = 0; j < outdatedModules.length; j++) {
			var outdatedModuleId = outdatedModules[j];
			var module = $moduleCache$[outdatedModuleId];
			if (
				module &&
				(module.hot._selfAccepted || module.hot._main) &&
				// removed self-accepted modules should not be required
				appliedUpdate[outdatedModuleId] !== warnUnexpectedRequire &&
				// when called invalidate self-accepting is not possible
				!module.hot._selfInvalidated
			) {
				outdatedSelfAcceptedModules.push({
					module: outdatedModuleId,
					require: module.hot._requireSelf,
					errorHandler: module.hot._selfAccepted
				});
			}
		}

		var moduleOutdatedDependencies;

		return {
			dispose: function () {
				currentUpdateRemovedChunks.forEach(function (chunkId) {
					delete $installedChunks$[chunkId];
				});
				currentUpdateRemovedChunks = undefined;

				var idx;
				var queue = outdatedModules.slice();
				while (queue.length > 0) {
					var moduleId = queue.pop();
					var module = $moduleCache$[moduleId];
					if (!module) continue;

					var data = {};

					// Call dispose handlers
					var disposeHandlers = module.hot._disposeHandlers;
					for (j = 0; j < disposeHandlers.length; j++) {
						disposeHandlers[j].call(null, data);
					}
					$hmrModuleData$[moduleId] = data;

					// disable module (this disables requires from this module)
					module.hot.active = false;

					// remove module from cache
					delete $moduleCache$[moduleId];

					// when disposing there is no need to call dispose handler
					delete outdatedDependencies[moduleId];

					// remove "parents" references from all children
					for (j = 0; j < module.children.length; j++) {
						var child = $moduleCache$[module.children[j]];
						if (!child) continue;
						idx = child.parents.indexOf(moduleId);
						if (idx >= 0) {
							child.parents.splice(idx, 1);
						}
					}
				}

				// remove outdated dependency from module children
				var dependency;
				for (var outdatedModuleId in outdatedDependencies) {
					if ($hasOwnProperty$(outdatedDependencies, outdatedModuleId)) {
						module = $moduleCache$[outdatedModuleId];
						if (module) {
							moduleOutdatedDependencies =
								outdatedDependencies[outdatedModuleId];
							for (j = 0; j < moduleOutdatedDependencies.length; j++) {
								dependency = moduleOutdatedDependencies[j];
								idx = module.children.indexOf(dependency);
								if (idx >= 0) module.children.splice(idx, 1);
							}
						}
					}
				}
			},
			apply: function (reportError) {
				// insert new code
				for (var updateModuleId in appliedUpdate) {
					if ($hasOwnProperty$(appliedUpdate, updateModuleId)) {
						$moduleFactories$[updateModuleId] = appliedUpdate[updateModuleId];
					}
				}

				// run new runtime modules
				for (var i = 0; i < currentUpdateRuntime.length; i++) {
					currentUpdateRuntime[i](__webpack_require__);
				}

				// call accept handlers
				for (var outdatedModuleId in outdatedDependencies) {
					if ($hasOwnProperty$(outdatedDependencies, outdatedModuleId)) {
						var module = $moduleCache$[outdatedModuleId];
						if (module) {
							moduleOutdatedDependencies =
								outdatedDependencies[outdatedModuleId];
							var callbacks = [];
							var errorHandlers = [];
							var dependenciesForCallbacks = [];
							for (var j = 0; j < moduleOutdatedDependencies.length; j++) {
								var dependency = moduleOutdatedDependencies[j];
								var acceptCallback =
									module.hot._acceptedDependencies[dependency];
								var errorHandler =
									module.hot._acceptedErrorHandlers[dependency];
								if (acceptCallback) {
									if (callbacks.indexOf(acceptCallback) !== -1) continue;
									callbacks.push(acceptCallback);
									errorHandlers.push(errorHandler);
									dependenciesForCallbacks.push(dependency);
								}
							}
							for (var k = 0; k < callbacks.length; k++) {
								try {
									callbacks[k].call(null, moduleOutdatedDependencies);
								} catch (err) {
									if (typeof errorHandlers[k] === "function") {
										try {
											errorHandlers[k](err, {
												moduleId: outdatedModuleId,
												dependencyId: dependenciesForCallbacks[k]
											});
										} catch (err2) {
											if (options.onErrored) {
												options.onErrored({
													type: "accept-error-handler-errored",
													moduleId: outdatedModuleId,
													dependencyId: dependenciesForCallbacks[k],
													error: err2,
													originalError: err
												});
											}
											if (!options.ignoreErrored) {
												reportError(err2);
												reportError(err);
											}
										}
									} else {
										if (options.onErrored) {
											options.onErrored({
												type: "accept-errored",
												moduleId: outdatedModuleId,
												dependencyId: dependenciesForCallbacks[k],
												error: err
											});
										}
										if (!options.ignoreErrored) {
											reportError(err);
										}
									}
								}
							}
						}
					}
				}

				// Load self accepted modules
				for (var o = 0; o < outdatedSelfAcceptedModules.length; o++) {
					var item = outdatedSelfAcceptedModules[o];
					var moduleId = item.module;
					try {
						item.require(moduleId);
					} catch (err) {
						if (typeof item.errorHandler === "function") {
							try {
								item.errorHandler(err, {
									moduleId: moduleId,
									module: $moduleCache$[moduleId]
								});
							} catch (err2) {
								if (options.onErrored) {
									options.onErrored({
										type: "self-accept-error-handler-errored",
										moduleId: moduleId,
										error: err2,
										originalError: err
									});
								}
								if (!options.ignoreErrored) {
									reportError(err2);
									reportError(err);
								}
							}
						} else {
							if (options.onErrored) {
								options.onErrored({
									type: "self-accept-errored",
									moduleId: moduleId,
									error: err
								});
							}
							if (!options.ignoreErrored) {
								reportError(err);
							}
						}
					}
				}

				return outdatedModules;
			}
		};
	}
	$hmrInvalidateModuleHandlers$.$key$ = function (moduleId, applyHandlers) {
		if (!currentUpdate) {
			currentUpdate = {};
			currentUpdateRuntime = [];
			currentUpdateRemovedChunks = [];
			applyHandlers.push(applyHandler);
		}
		if (!$hasOwnProperty$(currentUpdate, moduleId)) {
			currentUpdate[moduleId] = $moduleFactories$[moduleId];
		}
	};
	$hmrDownloadUpdateHandlers$.$key$ = function (
		chunkIds,
		removedChunks,
		removedModules,
		promises,
		applyHandlers,
		updatedModulesList
	) {
		applyHandlers.push(applyHandler);
		currentUpdateChunks = {};
		currentUpdateRemovedChunks = removedChunks;
		currentUpdate = removedModules.reduce(function (obj, key) {
			obj[key] = false;
			return obj;
		}, {});
		currentUpdateRuntime = [];
		chunkIds.forEach(function (chunkId) {
			if (
				$hasOwnProperty$($installedChunks$, chunkId) &&
				$installedChunks$[chunkId] !== undefined
			) {
				promises.push($loadUpdateChunk$(chunkId, updatedModulesList));
				currentUpdateChunks[chunkId] = true;
			} else {
				currentUpdateChunks[chunkId] = false;
			}
		});
		if ($ensureChunkHandlers$) {
			$ensureChunkHandlers$.$key$Hmr = function (chunkId, promises) {
				if (
					currentUpdateChunks &&
					$hasOwnProperty$(currentUpdateChunks, chunkId) &&
					!currentUpdateChunks[chunkId]
				) {
					promises.push($loadUpdateChunk$(chunkId));
					currentUpdateChunks[chunkId] = true;
				}
			};
		}
	};
};