hotModuleReplacement.js
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"use strict";
/* eslint-env browser */
/*
eslint-disable
no-console,
func-names
*/
/** @typedef {any} TODO */
var normalizeUrl = require("./normalize-url");
var srcByModuleId = Object.create(null);
var noDocument = typeof document === "undefined";
var forEach = Array.prototype.forEach;
/**
* @param {function} fn
* @param {number} time
* @returns {(function(): void)|*}
*/
function debounce(fn, time) {
var timeout = 0;
return function () {
// @ts-ignore
var self = this;
// eslint-disable-next-line prefer-rest-params
var args = arguments;
var functionCall = function functionCall() {
return fn.apply(self, args);
};
clearTimeout(timeout);
// @ts-ignore
timeout = setTimeout(functionCall, time);
};
}
function noop() {}
/**
* @param {TODO} moduleId
* @returns {TODO}
*/
function getCurrentScriptUrl(moduleId) {
var src = srcByModuleId[moduleId];
if (!src) {
if (document.currentScript) {
src = /** @type {HTMLScriptElement} */document.currentScript.src;
} else {
var scripts = document.getElementsByTagName("script");
var lastScriptTag = scripts[scripts.length - 1];
if (lastScriptTag) {
src = lastScriptTag.src;
}
}
srcByModuleId[moduleId] = src;
}
/**
* @param {string} fileMap
* @returns {null | string[]}
*/
return function (fileMap) {
if (!src) {
return null;
}
var splitResult = src.split(/([^\\/]+)\.js$/);
var filename = splitResult && splitResult[1];
if (!filename) {
return [src.replace(".js", ".css")];
}
if (!fileMap) {
return [src.replace(".js", ".css")];
}
return fileMap.split(",").map(function (mapRule) {
var reg = new RegExp("".concat(filename, "\\.js$"), "g");
return normalizeUrl(src.replace(reg, "".concat(mapRule.replace(/{fileName}/g, filename), ".css")));
});
};
}
/**
* @param {TODO} el
* @param {string} [url]
*/
function updateCss(el, url) {
if (!url) {
if (!el.href) {
return;
}
// eslint-disable-next-line
url = el.href.split("?")[0];
}
if (!isUrlRequest( /** @type {string} */url)) {
return;
}
if (el.isLoaded === false) {
// We seem to be about to replace a css link that hasn't loaded yet.
// We're probably changing the same file more than once.
return;
}
if (!url || !(url.indexOf(".css") > -1)) {
return;
}
// eslint-disable-next-line no-param-reassign
el.visited = true;
var newEl = el.cloneNode();
newEl.isLoaded = false;
newEl.addEventListener("load", function () {
if (newEl.isLoaded) {
return;
}
newEl.isLoaded = true;
el.parentNode.removeChild(el);
});
newEl.addEventListener("error", function () {
if (newEl.isLoaded) {
return;
}
newEl.isLoaded = true;
el.parentNode.removeChild(el);
});
newEl.href = "".concat(url, "?").concat(Date.now());
if (el.nextSibling) {
el.parentNode.insertBefore(newEl, el.nextSibling);
} else {
el.parentNode.appendChild(newEl);
}
}
/**
* @param {string} href
* @param {TODO} src
* @returns {TODO}
*/
function getReloadUrl(href, src) {
var ret;
// eslint-disable-next-line no-param-reassign
href = normalizeUrl(href);
src.some(
/**
* @param {string} url
*/
// eslint-disable-next-line array-callback-return
function (url) {
if (href.indexOf(src) > -1) {
ret = url;
}
});
return ret;
}
/**
* @param {string} [src]
* @returns {boolean}
*/
function reloadStyle(src) {
if (!src) {
return false;
}
var elements = document.querySelectorAll("link");
var loaded = false;
forEach.call(elements, function (el) {
if (!el.href) {
return;
}
var url = getReloadUrl(el.href, src);
if (!isUrlRequest(url)) {
return;
}
if (el.visited === true) {
return;
}
if (url) {
updateCss(el, url);
loaded = true;
}
});
return loaded;
}
function reloadAll() {
var elements = document.querySelectorAll("link");
forEach.call(elements, function (el) {
if (el.visited === true) {
return;
}
updateCss(el);
});
}
/**
* @param {string} url
* @returns {boolean}
*/
function isUrlRequest(url) {
// An URL is not an request if
// It is not http or https
if (!/^[a-zA-Z][a-zA-Z\d+\-.]*:/.test(url)) {
return false;
}
return true;
}
/**
* @param {TODO} moduleId
* @param {TODO} options
* @returns {TODO}
*/
module.exports = function (moduleId, options) {
if (noDocument) {
console.log("no window.document found, will not HMR CSS");
return noop;
}
var getScriptSrc = getCurrentScriptUrl(moduleId);
function update() {
var src = getScriptSrc(options.filename);
var reloaded = reloadStyle(src);
if (options.locals) {
console.log("[HMR] Detected local css modules. Reload all css");
reloadAll();
return;
}
if (reloaded) {
console.log("[HMR] css reload %s", src.join(" "));
} else {
console.log("[HMR] Reload all css");
reloadAll();
}
}
return debounce(update, 50);
};