webpack/hot/only-dev-server.js

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.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
/* globals __webpack_hash__ */
if (module.hot) {
	/** @type {undefined | string} */
	var lastHash;
	var upToDate = function upToDate() {
		return /** @type {string} */ (lastHash).indexOf(__webpack_hash__) >= 0;
	};
	var log = require("./log");
	var check = function check() {
		module.hot
			.check()
			.then(function (updatedModules) {
				if (!updatedModules) {
					log("warning", "[HMR] Cannot find update. Need to do a full reload!");
					log(
						"warning",
						"[HMR] (Probably because of restarting the webpack-dev-server)"
					);
					return;
				}

				return module.hot
					.apply({
						ignoreUnaccepted: true,
						ignoreDeclined: true,
						ignoreErrored: true,
						onUnaccepted: function (data) {
							log(
								"warning",
								"Ignored an update to unaccepted module " +
									data.chain.join(" -> ")
							);
						},
						onDeclined: function (data) {
							log(
								"warning",
								"Ignored an update to declined module " +
									data.chain.join(" -> ")
							);
						},
						onErrored: function (data) {
							log("error", data.error);
							log(
								"warning",
								"Ignored an error while updating module " +
									data.moduleId +
									" (" +
									data.type +
									")"
							);
						}
					})
					.then(function (renewedModules) {
						if (!upToDate()) {
							check();
						}

						require("./log-apply-result")(updatedModules, renewedModules);

						if (upToDate()) {
							log("info", "[HMR] App is up to date.");
						}
					});
			})
			.catch(function (err) {
				var status = module.hot.status();
				if (["abort", "fail"].indexOf(status) >= 0) {
					log(
						"warning",
						"[HMR] Cannot check for update. Need to do a full reload!"
					);
					log("warning", "[HMR] " + log.formatError(err));
				} else {
					log("warning", "[HMR] Update check failed: " + log.formatError(err));
				}
			});
	};
	/** @type {EventTarget | NodeJS.EventEmitter} */
	var hotEmitter = require("./emitter");
	/**
	 * @param {CustomEvent<{ currentHash: string }>} event event or hash
	 */
	var handler = function (event) {
		lastHash = typeof event === "string" ? event : event.detail.currentHash;
		if (!upToDate()) {
			var status = module.hot.status();
			if (status === "idle") {
				log("info", "[HMR] Checking for updates on the server...");
				check();
			} else if (["abort", "fail"].indexOf(status) >= 0) {
				log(
					"warning",
					"[HMR] Cannot apply update as a previous update " +
						status +
						"ed. Need to do a full reload!"
				);
			}
		}
	};

	if (typeof EventTarget !== "undefined" && hotEmitter instanceof EventTarget) {
		hotEmitter.addEventListener(
			"webpackHotUpdate",
			/** @type {EventListener} */
			(handler)
		);
	} else {
		hotEmitter.on("webpackHotUpdate", handler);
	}

	log("info", "[HMR] Waiting for update signal from WDS...");
} else {
	throw new Error("[HMR] Hot Module Replacement is disabled.");
}