MZC/KnowMathBot/frontend/node_modules/@pixi/loaders/dist/browser/loaders.js

/*!
 * @pixi/loaders - v6.5.10
 * Compiled Thu, 06 Jul 2023 15:25:11 UTC
 *
 * @pixi/loaders is licensed under the MIT License.
 * http://www.opensource.org/licenses/mit-license
 */
this.PIXI = this.PIXI || {};
var _pixi_loaders = (function (exports, core, utils) {
    'use strict';

    /* jshint -W097 */
    /**
     * @memberof PIXI
     */
    var SignalBinding = /** @class */ (function () {
        /**
         * SignalBinding constructor.
         * @constructs SignalBinding
         * @param {Function} fn - Event handler to be called.
         * @param {boolean} [once=false] - Should this listener be removed after dispatch
         * @param {object} [thisArg] - The context of the callback function.
         * @api private
         */
        // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
        function SignalBinding(fn, once, thisArg) {
            if (once === void 0) { once = false; }
            this._fn = fn;
            this._once = once;
            this._thisArg = thisArg;
            this._next = this._prev = this._owner = null;
        }
        SignalBinding.prototype.detach = function () {
            if (this._owner === null)
                { return false; }
            this._owner.detach(this);
            return true;
        };
        return SignalBinding;
    }());
    /**
     * @param self
     * @param node
     * @private
     */
    function _addSignalBinding(self, node) {
        if (!self._head) {
            self._head = node;
            self._tail = node;
        }
        else {
            self._tail._next = node;
            node._prev = self._tail;
            self._tail = node;
        }
        node._owner = self;
        return node;
    }
    /**
     * @memberof PIXI
     */
    var Signal = /** @class */ (function () {
        /**
         * MiniSignal constructor.
         * @example
         * let mySignal = new Signal();
         * let binding = mySignal.add(onSignal);
         * mySignal.dispatch('foo', 'bar');
         * mySignal.detach(binding);
         */
        function Signal() {
            this._head = this._tail = undefined;
        }
        /**
         * Return an array of attached SignalBinding.
         * @param {boolean} [exists=false] - We only need to know if there are handlers.
         * @returns {PIXI.SignalBinding[] | boolean} Array of attached SignalBinding or Boolean if called with exists = true
         * @api public
         */
        Signal.prototype.handlers = function (exists) {
            if (exists === void 0) { exists = false; }
            var node = this._head;
            if (exists)
                { return !!node; }
            var ee = [];
            while (node) {
                ee.push(node);
                node = node._next;
            }
            return ee;
        };
        /**
         * Return true if node is a SignalBinding attached to this MiniSignal
         * @param {PIXI.SignalBinding} node - Node to check.
         * @returns {boolean} True if node is attache to mini-signal
         */
        Signal.prototype.has = function (node) {
            if (!(node instanceof SignalBinding)) {
                throw new Error('MiniSignal#has(): First arg must be a SignalBinding object.');
            }
            return node._owner === this;
        };
        /**
         * Dispaches a signal to all registered listeners.
         * @param {...any} args
         * @returns {boolean} Indication if we've emitted an event.
         */
        Signal.prototype.dispatch = function () {
            var arguments$1 = arguments;

            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i] = arguments$1[_i];
            }
            var node = this._head;
            if (!node)
                { return false; }
            while (node) {
                if (node._once)
                    { this.detach(node); }
                node._fn.apply(node._thisArg, args);
                node = node._next;
            }
            return true;
        };
        /**
         * Register a new listener.
         * @param {Function} fn - Callback function.
         * @param {object} [thisArg] - The context of the callback function.
         * @returns {PIXI.SignalBinding} The SignalBinding node that was added.
         */
        Signal.prototype.add = function (fn, thisArg) {
            if (thisArg === void 0) { thisArg = null; }
            if (typeof fn !== 'function') {
                throw new Error('MiniSignal#add(): First arg must be a Function.');
            }
            return _addSignalBinding(this, new SignalBinding(fn, false, thisArg));
        };
        /**
         * Register a new listener that will be executed only once.
         * @param {Function} fn - Callback function.
         * @param {object} [thisArg] - The context of the callback function.
         * @returns {PIXI.SignalBinding} The SignalBinding node that was added.
         */
        Signal.prototype.once = function (fn, thisArg) {
            if (thisArg === void 0) { thisArg = null; }
            if (typeof fn !== 'function') {
                throw new Error('MiniSignal#once(): First arg must be a Function.');
            }
            return _addSignalBinding(this, new SignalBinding(fn, true, thisArg));
        };
        /**
         * Remove binding object.
         * @param {PIXI.SignalBinding} node - The binding node that will be removed.
         * @returns {Signal} The instance on which this method was called.
          @api public */
        Signal.prototype.detach = function (node) {
            if (!(node instanceof SignalBinding)) {
                throw new Error('MiniSignal#detach(): First arg must be a SignalBinding object.');
            }
            if (node._owner !== this)
                { return this; } // todo: or error?
            if (node._prev)
                { node._prev._next = node._next; }
            if (node._next)
                { node._next._prev = node._prev; }
            if (node === this._head) { // first node
                this._head = node._next;
                if (node._next === null) {
                    this._tail = null;
                }
            }
            else if (node === this._tail) { // last node
                this._tail = node._prev;
                this._tail._next = null;
            }
            node._owner = null;
            return this;
        };
        /**
         * Detach all listeners.
         * @returns {Signal} The instance on which this method was called.
         */
        Signal.prototype.detachAll = function () {
            var node = this._head;
            if (!node)
                { return this; }
            this._head = this._tail = null;
            while (node) {
                node._owner = null;
                node = node._next;
            }
            return this;
        };
        return Signal;
    }());

    /**
     * function from npm package `parseUri`, converted to TS to avoid leftpad incident
     * @param {string} str
     * @param [opts] - options
     * @param {boolean} [opts.strictMode] - type of parser
     */
    function parseUri(str, opts) {
        opts = opts || {};
        var o = {
            // eslint-disable-next-line max-len
            key: ['source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'],
            q: {
                name: 'queryKey',
                parser: /(?:^|&)([^&=]*)=?([^&]*)/g
            },
            parser: {
                // eslint-disable-next-line max-len
                strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
                // eslint-disable-next-line max-len
                loose: /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/
            }
        };
        var m = o.parser[opts.strictMode ? 'strict' : 'loose'].exec(str);
        var uri = {};
        var i = 14;
        while (i--)
            { uri[o.key[i]] = m[i] || ''; }
        uri[o.q.name] = {};
        uri[o.key[12]].replace(o.q.parser, function (_t0, t1, t2) {
            if (t1)
                { uri[o.q.name][t1] = t2; }
        });
        return uri;
    }

    // tests if CORS is supported in XHR, if not we need to use XDR
    var useXdr;
    var tempAnchor = null;
    // some status constants
    var STATUS_NONE = 0;
    var STATUS_OK = 200;
    var STATUS_EMPTY = 204;
    var STATUS_IE_BUG_EMPTY = 1223;
    var STATUS_TYPE_OK = 2;
    // noop
    function _noop$1() { }
    /**
     * Quick helper to set a value on one of the extension maps. Ensures there is no
     * dot at the start of the extension.
     * @ignore
     * @param map - The map to set on.
     * @param extname - The extension (or key) to set.
     * @param val - The value to set.
     */
    function setExtMap(map, extname, val) {
        if (extname && extname.indexOf('.') === 0) {
            extname = extname.substring(1);
        }
        if (!extname) {
            return;
        }
        map[extname] = val;
    }
    /**
     * Quick helper to get string xhr type.
     * @ignore
     * @param xhr - The request to check.
     * @returns The type.
     */
    function reqType(xhr) {
        return xhr.toString().replace('object ', '');
    }
    /**
     * Manages the state and loading of a resource and all child resources.
     *
     * Can be extended in `GlobalMixins.LoaderResource`.
     * @memberof PIXI
     */
    exports.LoaderResource = /** @class */ (function () {
        /**
         * @param {string} name - The name of the resource to load.
         * @param {string|string[]} url - The url for this resource, for audio/video loads you can pass
         *      an array of sources.
         * @param {object} [options] - The options for the load.
         * @param {string|boolean} [options.crossOrigin] - Is this request cross-origin? Default is to
         *      determine automatically.
         * @param {number} [options.timeout=0] - A timeout in milliseconds for the load. If the load takes
         *      longer than this time it is cancelled and the load is considered a failure. If this value is
         *      set to `0` then there is no explicit timeout.
         * @param {PIXI.LoaderResource.LOAD_TYPE} [options.loadType=LOAD_TYPE.XHR] - How should this resource
         *      be loaded?
         * @param {PIXI.LoaderResource.XHR_RESPONSE_TYPE} [options.xhrType=XHR_RESPONSE_TYPE.DEFAULT] - How
         *      should the data being loaded be interpreted when using XHR?
         * @param {PIXI.LoaderResource.IMetadata} [options.metadata] - Extra configuration for middleware
         *      and the Resource object.
         */
        function LoaderResource(name, url, options) {
            /**
             * The `dequeue` method that will be used a storage place for the async queue dequeue method
             * used privately by the loader.
             * @private
             * @member {Function}
             */
            this._dequeue = _noop$1;
            /**
             * Used a storage place for the on load binding used privately by the loader.
             * @private
             * @member {Function}
             */
            this._onLoadBinding = null;
            /**
             * The timer for element loads to check if they timeout.
             * @private
             */
            this._elementTimer = 0;
            /**
             * The `complete` function bound to this resource's context.
             * @private
             * @type {Function}
             */
            this._boundComplete = null;
            /**
             * The `_onError` function bound to this resource's context.
             * @private
             * @type {Function}
             */
            this._boundOnError = null;
            /**
             * The `_onProgress` function bound to this resource's context.
             * @private
             * @type {Function}
             */
            this._boundOnProgress = null;
            /**
             * The `_onTimeout` function bound to this resource's context.
             * @private
             * @type {Function}
             */
            this._boundOnTimeout = null;
            this._boundXhrOnError = null;
            this._boundXhrOnTimeout = null;
            this._boundXhrOnAbort = null;
            this._boundXhrOnLoad = null;
            if (typeof name !== 'string' || typeof url !== 'string') {
                throw new Error('Both name and url are required for constructing a resource.');
            }
            options = options || {};
            this._flags = 0;
            // set data url flag, needs to be set early for some _determineX checks to work.
            this._setFlag(LoaderResource.STATUS_FLAGS.DATA_URL, url.indexOf('data:') === 0);
            this.name = name;
            this.url = url;
            this.extension = this._getExtension();
            this.data = null;
            this.crossOrigin = options.crossOrigin === true ? 'anonymous' : options.crossOrigin;
            this.timeout = options.timeout || 0;
            this.loadType = options.loadType || this._determineLoadType();
            // The type used to load the resource via XHR. If unset, determined automatically.
            this.xhrType = options.xhrType;
            // Extra info for middleware, and controlling specifics about how the resource loads.
            // Note that if you pass in a `loadElement`, the Resource class takes ownership of it.
            // Meaning it will modify it as it sees fit.
            this.metadata = options.metadata || {};
            // The error that occurred while loading (if any).
            this.error = null;
            // The XHR object that was used to load this resource. This is only set
            // when `loadType` is `LoaderResource.LOAD_TYPE.XHR`.
            this.xhr = null;
            // The child resources this resource owns.
            this.children = [];
            // The resource type.
            this.type = LoaderResource.TYPE.UNKNOWN;
            // The progress chunk owned by this resource.
            this.progressChunk = 0;
            // The `dequeue` method that will be used a storage place for the async queue dequeue method
            // used privately by the loader.
            this._dequeue = _noop$1;
            // Used a storage place for the on load binding used privately by the loader.
            this._onLoadBinding = null;
            // The timer for element loads to check if they timeout.
            this._elementTimer = 0;
            this._boundComplete = this.complete.bind(this);
            this._boundOnError = this._onError.bind(this);
            this._boundOnProgress = this._onProgress.bind(this);
            this._boundOnTimeout = this._onTimeout.bind(this);
            // xhr callbacks
            this._boundXhrOnError = this._xhrOnError.bind(this);
            this._boundXhrOnTimeout = this._xhrOnTimeout.bind(this);
            this._boundXhrOnAbort = this._xhrOnAbort.bind(this);
            this._boundXhrOnLoad = this._xhrOnLoad.bind(this);
            // Dispatched when the resource beings to load.
            this.onStart = new Signal();
            // Dispatched each time progress of this resource load updates.
            // Not all resources types and loader systems can support this event
            // so sometimes it may not be available. If the resource
            // is being loaded on a modern browser, using XHR, and the remote server
            // properly sets Content-Length headers, then this will be available.
            this.onProgress = new Signal();
            // Dispatched once this resource has loaded, if there was an error it will
            // be in the `error` property.
            this.onComplete = new Signal();
            // Dispatched after this resource has had all the *after* middleware run on it.
            this.onAfterMiddleware = new Signal();
        }
        /**
         * Sets the load type to be used for a specific extension.
         * @static
         * @param {string} extname - The extension to set the type for, e.g. "png" or "fnt"
         * @param {PIXI.LoaderResource.LOAD_TYPE} loadType - The load type to set it to.
         */
        LoaderResource.setExtensionLoadType = function (extname, loadType) {
            setExtMap(LoaderResource._loadTypeMap, extname, loadType);
        };
        /**
         * Sets the load type to be used for a specific extension.
         * @static
         * @param {string} extname - The extension to set the type for, e.g. "png" or "fnt"
         * @param {PIXI.LoaderResource.XHR_RESPONSE_TYPE} xhrType - The xhr type to set it to.
         */
        LoaderResource.setExtensionXhrType = function (extname, xhrType) {
            setExtMap(LoaderResource._xhrTypeMap, extname, xhrType);
        };
        Object.defineProperty(LoaderResource.prototype, "isDataUrl", {
            /**
             * When the resource starts to load.
             * @memberof PIXI.LoaderResource
             * @callback OnStartSignal
             * @param {PIXI.Resource} resource - The resource that the event happened on.
             */
            /**
             * When the resource reports loading progress.
             * @memberof PIXI.LoaderResource
             * @callback OnProgressSignal
             * @param {PIXI.Resource} resource - The resource that the event happened on.
             * @param {number} percentage - The progress of the load in the range [0, 1].
             */
            /**
             * When the resource finishes loading.
             * @memberof PIXI.LoaderResource
             * @callback OnCompleteSignal
             * @param {PIXI.Resource} resource - The resource that the event happened on.
             */
            /**
             * @memberof PIXI.LoaderResource
             * @typedef {object} IMetadata
             * @property {HTMLImageElement|HTMLAudioElement|HTMLVideoElement} [loadElement=null] - The
             *      element to use for loading, instead of creating one.
             * @property {boolean} [skipSource=false] - Skips adding source(s) to the load element. This
             *      is useful if you want to pass in a `loadElement` that you already added load sources to.
             * @property {string|string[]} [mimeType] - The mime type to use for the source element
             *      of a video/audio elment. If the urls are an array, you can pass this as an array as well
             *      where each index is the mime type to use for the corresponding url index.
             */
            /**
             * Stores whether or not this url is a data url.
             * @readonly
             * @member {boolean}
             */
            get: function () {
                return this._hasFlag(LoaderResource.STATUS_FLAGS.DATA_URL);
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(LoaderResource.prototype, "isComplete", {
            /**
             * Describes if this resource has finished loading. Is true when the resource has completely
             * loaded.
             * @readonly
             * @member {boolean}
             */
            get: function () {
                return this._hasFlag(LoaderResource.STATUS_FLAGS.COMPLETE);
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(LoaderResource.prototype, "isLoading", {
            /**
             * Describes if this resource is currently loading. Is true when the resource starts loading,
             * and is false again when complete.
             * @readonly
             * @member {boolean}
             */
            get: function () {
                return this._hasFlag(LoaderResource.STATUS_FLAGS.LOADING);
            },
            enumerable: false,
            configurable: true
        });
        /** Marks the resource as complete. */
        LoaderResource.prototype.complete = function () {
            this._clearEvents();
            this._finish();
        };
        /**
         * Aborts the loading of this resource, with an optional message.
         * @param {string} message - The message to use for the error
         */
        LoaderResource.prototype.abort = function (message) {
            // abort can be called multiple times, ignore subsequent calls.
            if (this.error) {
                return;
            }
            // store error
            this.error = new Error(message);
            // clear events before calling aborts
            this._clearEvents();
            // abort the actual loading
            if (this.xhr) {
                this.xhr.abort();
            }
            else if (this.xdr) {
                this.xdr.abort();
            }
            else if (this.data) {
                // single source
                if (this.data.src) {
                    this.data.src = LoaderResource.EMPTY_GIF;
                }
                // multi-source
                else {
                    while (this.data.firstChild) {
                        this.data.removeChild(this.data.firstChild);
                    }
                }
            }
            // done now.
            this._finish();
        };
        /**
         * Kicks off loading of this resource. This method is asynchronous.
         * @param {PIXI.LoaderResource.OnCompleteSignal} [cb] - Optional callback to call once the resource is loaded.
         */
        LoaderResource.prototype.load = function (cb) {
            var _this = this;
            if (this.isLoading) {
                return;
            }
            if (this.isComplete) {
                if (cb) {
                    setTimeout(function () { return cb(_this); }, 1);
                }
                return;
            }
            else if (cb) {
                this.onComplete.once(cb);
            }
            this._setFlag(LoaderResource.STATUS_FLAGS.LOADING, true);
            this.onStart.dispatch(this);
            // if unset, determine the value
            if (this.crossOrigin === false || typeof this.crossOrigin !== 'string') {
                this.crossOrigin = this._determineCrossOrigin(this.url);
            }
            switch (this.loadType) {
                case LoaderResource.LOAD_TYPE.IMAGE:
                    this.type = LoaderResource.TYPE.IMAGE;
                    this._loadElement('image');
                    break;
                case LoaderResource.LOAD_TYPE.AUDIO:
                    this.type = LoaderResource.TYPE.AUDIO;
                    this._loadSourceElement('audio');
                    break;
                case LoaderResource.LOAD_TYPE.VIDEO:
                    this.type = LoaderResource.TYPE.VIDEO;
                    this._loadSourceElement('video');
                    break;
                case LoaderResource.LOAD_TYPE.XHR:
                /* falls through */
                default:
                    if (typeof useXdr === 'undefined') {
                        useXdr = !!(globalThis.XDomainRequest && !('withCredentials' in (new XMLHttpRequest())));
                    }
                    if (useXdr && this.crossOrigin) {
                        this._loadXdr();
                    }
                    else {
                        this._loadXhr();
                    }
                    break;
            }
        };
        /**
         * Checks if the flag is set.
         * @param flag - The flag to check.
         * @returns True if the flag is set.
         */
        LoaderResource.prototype._hasFlag = function (flag) {
            return (this._flags & flag) !== 0;
        };
        /**
         * (Un)Sets the flag.
         * @param flag - The flag to (un)set.
         * @param value - Whether to set or (un)set the flag.
         */
        LoaderResource.prototype._setFlag = function (flag, value) {
            this._flags = value ? (this._flags | flag) : (this._flags & ~flag);
        };
        /** Clears all the events from the underlying loading source. */
        LoaderResource.prototype._clearEvents = function () {
            clearTimeout(this._elementTimer);
            if (this.data && this.data.removeEventListener) {
                this.data.removeEventListener('error', this._boundOnError, false);
                this.data.removeEventListener('load', this._boundComplete, false);
                this.data.removeEventListener('progress', this._boundOnProgress, false);
                this.data.removeEventListener('canplaythrough', this._boundComplete, false);
            }
            if (this.xhr) {
                if (this.xhr.removeEventListener) {
                    this.xhr.removeEventListener('error', this._boundXhrOnError, false);
                    this.xhr.removeEventListener('timeout', this._boundXhrOnTimeout, false);
                    this.xhr.removeEventListener('abort', this._boundXhrOnAbort, false);
                    this.xhr.removeEventListener('progress', this._boundOnProgress, false);
                    this.xhr.removeEventListener('load', this._boundXhrOnLoad, false);
                }
                else {
                    this.xhr.onerror = null;
                    this.xhr.ontimeout = null;
                    this.xhr.onprogress = null;
                    this.xhr.onload = null;
                }
            }
        };
        /** Finalizes the load. */
        LoaderResource.prototype._finish = function () {
            if (this.isComplete) {
                throw new Error('Complete called again for an already completed resource.');
            }
            this._setFlag(LoaderResource.STATUS_FLAGS.COMPLETE, true);
            this._setFlag(LoaderResource.STATUS_FLAGS.LOADING, false);
            this.onComplete.dispatch(this);
        };
        /**
         * Loads this resources using an element that has a single source,
         * like an HTMLImageElement.
         * @private
         * @param type - The type of element to use.
         */
        LoaderResource.prototype._loadElement = function (type) {
            if (this.metadata.loadElement) {
                this.data = this.metadata.loadElement;
            }
            else if (type === 'image' && typeof globalThis.Image !== 'undefined') {
                this.data = new Image();
            }
            else {
                this.data = document.createElement(type);
            }
            if (this.crossOrigin) {
                this.data.crossOrigin = this.crossOrigin;
            }
            if (!this.metadata.skipSource) {
                this.data.src = this.url;
            }
            this.data.addEventListener('error', this._boundOnError, false);
            this.data.addEventListener('load', this._boundComplete, false);
            this.data.addEventListener('progress', this._boundOnProgress, false);
            if (this.timeout) {
                this._elementTimer = setTimeout(this._boundOnTimeout, this.timeout);
            }
        };
        /**
         * Loads this resources using an element that has multiple sources,
         * like an HTMLAudioElement or HTMLVideoElement.
         * @param type - The type of element to use.
         */
        LoaderResource.prototype._loadSourceElement = function (type) {
            if (this.metadata.loadElement) {
                this.data = this.metadata.loadElement;
            }
            else if (type === 'audio' && typeof globalThis.Audio !== 'undefined') {
                this.data = new Audio();
            }
            else {
                this.data = document.createElement(type);
            }
            if (this.data === null) {
                this.abort("Unsupported element: " + type);
                return;
            }
            if (this.crossOrigin) {
                this.data.crossOrigin = this.crossOrigin;
            }
            if (!this.metadata.skipSource) {
                // support for CocoonJS Canvas+ runtime, lacks document.createElement('source')
                if (navigator.isCocoonJS) {
                    this.data.src = Array.isArray(this.url) ? this.url[0] : this.url;
                }
                else if (Array.isArray(this.url)) {
                    var mimeTypes = this.metadata.mimeType;
                    for (var i = 0; i < this.url.length; ++i) {
                        this.data.appendChild(this._createSource(type, this.url[i], Array.isArray(mimeTypes) ? mimeTypes[i] : mimeTypes));
                    }
                }
                else {
                    var mimeTypes = this.metadata.mimeType;
                    this.data.appendChild(this._createSource(type, this.url, Array.isArray(mimeTypes) ? mimeTypes[0] : mimeTypes));
                }
            }
            this.data.addEventListener('error', this._boundOnError, false);
            this.data.addEventListener('load', this._boundComplete, false);
            this.data.addEventListener('progress', this._boundOnProgress, false);
            this.data.addEventListener('canplaythrough', this._boundComplete, false);
            this.data.load();
            if (this.timeout) {
                this._elementTimer = setTimeout(this._boundOnTimeout, this.timeout);
            }
        };
        /** Loads this resources using an XMLHttpRequest. */
        LoaderResource.prototype._loadXhr = function () {
            // if unset, determine the value
            if (typeof this.xhrType !== 'string') {
                this.xhrType = this._determineXhrType();
            }
            var xhr = this.xhr = new XMLHttpRequest();
            // send credentials when crossOrigin with credentials requested
            if (this.crossOrigin === 'use-credentials') {
                xhr.withCredentials = true;
            }
            // set the request type and url
            xhr.open('GET', this.url, true);
            xhr.timeout = this.timeout;
            // load json as text and parse it ourselves. We do this because some browsers
            // *cough* safari *cough* can't deal with it.
            if (this.xhrType === LoaderResource.XHR_RESPONSE_TYPE.JSON
                || this.xhrType === LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT) {
                xhr.responseType = LoaderResource.XHR_RESPONSE_TYPE.TEXT;
            }
            else {
                xhr.responseType = this.xhrType;
            }
            xhr.addEventListener('error', this._boundXhrOnError, false);
            xhr.addEventListener('timeout', this._boundXhrOnTimeout, false);
            xhr.addEventListener('abort', this._boundXhrOnAbort, false);
            xhr.addEventListener('progress', this._boundOnProgress, false);
            xhr.addEventListener('load', this._boundXhrOnLoad, false);
            xhr.send();
        };
        /** Loads this resources using an XDomainRequest. This is here because we need to support IE9 (gross). */
        LoaderResource.prototype._loadXdr = function () {
            // if unset, determine the value
            if (typeof this.xhrType !== 'string') {
                this.xhrType = this._determineXhrType();
            }
            var xdr = this.xhr = new globalThis.XDomainRequest(); // eslint-disable-line no-undef
            // XDomainRequest has a few quirks. Occasionally it will abort requests
            // A way to avoid this is to make sure ALL callbacks are set even if not used
            // More info here: http://stackoverflow.com/questions/15786966/xdomainrequest-aborts-post-on-ie-9
            xdr.timeout = this.timeout || 5000; // XDR needs a timeout value or it breaks in IE9
            xdr.onerror = this._boundXhrOnError;
            xdr.ontimeout = this._boundXhrOnTimeout;
            xdr.onprogress = this._boundOnProgress;
            xdr.onload = this._boundXhrOnLoad;
            xdr.open('GET', this.url, true);
            // Note: The xdr.send() call is wrapped in a timeout to prevent an
            // issue with the interface where some requests are lost if multiple
            // XDomainRequests are being sent at the same time.
            // Some info here: https://github.com/photonstorm/phaser/issues/1248
            setTimeout(function () { return xdr.send(); }, 1);
        };
        /**
         * Creates a source used in loading via an element.
         * @param type - The element type (video or audio).
         * @param url - The source URL to load from.
         * @param [mime] - The mime type of the video
         * @returns The source element.
         */
        LoaderResource.prototype._createSource = function (type, url, mime) {
            if (!mime) {
                mime = type + "/" + this._getExtension(url);
            }
            var source = document.createElement('source');
            source.src = url;
            source.type = mime;
            return source;
        };
        /**
         * Called if a load errors out.
         * @param event - The error event from the element that emits it.
         */
        LoaderResource.prototype._onError = function (event) {
            this.abort("Failed to load element using: " + event.target.nodeName);
        };
        /**
         * Called if a load progress event fires for an element or xhr/xdr.
         * @param event - Progress event.
         */
        LoaderResource.prototype._onProgress = function (event) {
            if (event && event.lengthComputable) {
                this.onProgress.dispatch(this, event.loaded / event.total);
            }
        };
        /** Called if a timeout event fires for an element. */
        LoaderResource.prototype._onTimeout = function () {
            this.abort("Load timed out.");
        };
        /** Called if an error event fires for xhr/xdr. */
        LoaderResource.prototype._xhrOnError = function () {
            var xhr = this.xhr;
            this.abort(reqType(xhr) + " Request failed. Status: " + xhr.status + ", text: \"" + xhr.statusText + "\"");
        };
        /** Called if an error event fires for xhr/xdr. */
        LoaderResource.prototype._xhrOnTimeout = function () {
            var xhr = this.xhr;
            this.abort(reqType(xhr) + " Request timed out.");
        };
        /** Called if an abort event fires for xhr/xdr. */
        LoaderResource.prototype._xhrOnAbort = function () {
            var xhr = this.xhr;
            this.abort(reqType(xhr) + " Request was aborted by the user.");
        };
        /** Called when data successfully loads from an xhr/xdr request. */
        LoaderResource.prototype._xhrOnLoad = function () {
            var xhr = this.xhr;
            var text = '';
            var status = typeof xhr.status === 'undefined' ? STATUS_OK : xhr.status; // XDR has no `.status`, assume 200.
            // responseText is accessible only if responseType is '' or 'text' and on older browsers
            if (xhr.responseType === '' || xhr.responseType === 'text' || typeof xhr.responseType === 'undefined') {
                text = xhr.responseText;
            }
            // status can be 0 when using the `file://` protocol so we also check if a response is set.
            // If it has a response, we assume 200; otherwise a 0 status code with no contents is an aborted request.
            if (status === STATUS_NONE && (text.length > 0 || xhr.responseType === LoaderResource.XHR_RESPONSE_TYPE.BUFFER)) {
                status = STATUS_OK;
            }
            // handle IE9 bug: http://stackoverflow.com/questions/10046972/msie-returns-status-code-of-1223-for-ajax-request
            else if (status === STATUS_IE_BUG_EMPTY) {
                status = STATUS_EMPTY;
            }
            var statusType = (status / 100) | 0;
            if (statusType === STATUS_TYPE_OK) {
                // if text, just return it
                if (this.xhrType === LoaderResource.XHR_RESPONSE_TYPE.TEXT) {
                    this.data = text;
                    this.type = LoaderResource.TYPE.TEXT;
                }
                // if json, parse into json object
                else if (this.xhrType === LoaderResource.XHR_RESPONSE_TYPE.JSON) {
                    try {
                        this.data = JSON.parse(text);
                        this.type = LoaderResource.TYPE.JSON;
                    }
                    catch (e) {
                        this.abort("Error trying to parse loaded json: " + e);
                        return;
                    }
                }
                // if xml, parse into an xml document or div element
                else if (this.xhrType === LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT) {
                    try {
                        if (globalThis.DOMParser) {
                            var domparser = new DOMParser();
                            this.data = domparser.parseFromString(text, 'text/xml');
                        }
                        else {
                            var div = document.createElement('div');
                            div.innerHTML = text;
                            this.data = div;
                        }
                        this.type = LoaderResource.TYPE.XML;
                    }
                    catch (e$1) {
                        this.abort("Error trying to parse loaded xml: " + e$1);
                        return;
                    }
                }
                // other types just return the response
                else {
                    this.data = xhr.response || text;
                }
            }
            else {
                this.abort("[" + xhr.status + "] " + xhr.statusText + ": " + xhr.responseURL);
                return;
            }
            this.complete();
        };
        /**
         * Sets the `crossOrigin` property for this resource based on if the url
         * for this resource is cross-origin. If crossOrigin was manually set, this
         * function does nothing.
         * @private
         * @param url - The url to test.
         * @param [loc=globalThis.location] - The location object to test against.
         * @returns The crossOrigin value to use (or empty string for none).
         */
        // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
        LoaderResource.prototype._determineCrossOrigin = function (url, loc) {
            // data: and javascript: urls are considered same-origin
            if (url.indexOf('data:') === 0) {
                return '';
            }
            // A sandboxed iframe without the 'allow-same-origin' attribute will have a special
            // origin designed not to match globalThis.location.origin, and will always require
            // crossOrigin requests regardless of whether the location matches.
            if (globalThis.origin !== globalThis.location.origin) {
                return 'anonymous';
            }
            // default is globalThis.location
            loc = loc || globalThis.location;
            if (!tempAnchor) {
                tempAnchor = document.createElement('a');
            }
            // let the browser determine the full href for the url of this resource and then
            // parse with the node url lib, we can't use the properties of the anchor element
            // because they don't work in IE9 :(
            tempAnchor.href = url;
            var parsedUrl = parseUri(tempAnchor.href, { strictMode: true });
            var samePort = (!parsedUrl.port && loc.port === '') || (parsedUrl.port === loc.port);
            var protocol = parsedUrl.protocol ? parsedUrl.protocol + ":" : '';
            // if cross origin
            if (parsedUrl.host !== loc.hostname || !samePort || protocol !== loc.protocol) {
                return 'anonymous';
            }
            return '';
        };
        /**
         * Determines the responseType of an XHR request based on the extension of the
         * resource being loaded.
         * @private
         * @returns {PIXI.LoaderResource.XHR_RESPONSE_TYPE} The responseType to use.
         */
        LoaderResource.prototype._determineXhrType = function () {
            return LoaderResource._xhrTypeMap[this.extension] || LoaderResource.XHR_RESPONSE_TYPE.TEXT;
        };
        /**
         * Determines the loadType of a resource based on the extension of the
         * resource being loaded.
         * @private
         * @returns {PIXI.LoaderResource.LOAD_TYPE} The loadType to use.
         */
        LoaderResource.prototype._determineLoadType = function () {
            return LoaderResource._loadTypeMap[this.extension] || LoaderResource.LOAD_TYPE.XHR;
        };
        /**
         * Extracts the extension (sans '.') of the file being loaded by the resource.
         * @param [url] - url to parse, `this.url` by default.
         * @returns The extension.
         */
        LoaderResource.prototype._getExtension = function (url) {
            if (url === void 0) { url = this.url; }
            var ext = '';
            if (this.isDataUrl) {
                var slashIndex = url.indexOf('/');
                ext = url.substring(slashIndex + 1, url.indexOf(';', slashIndex));
            }
            else {
                var queryStart = url.indexOf('?');
                var hashStart = url.indexOf('#');
                var index = Math.min(queryStart > -1 ? queryStart : url.length, hashStart > -1 ? hashStart : url.length);
                url = url.substring(0, index);
                ext = url.substring(url.lastIndexOf('.') + 1);
            }
            return ext.toLowerCase();
        };
        /**
         * Determines the mime type of an XHR request based on the responseType of
         * resource being loaded.
         * @param type - The type to get a mime type for.
         * @private
         * @returns The mime type to use.
         */
        LoaderResource.prototype._getMimeFromXhrType = function (type) {
            switch (type) {
                case LoaderResource.XHR_RESPONSE_TYPE.BUFFER:
                    return 'application/octet-binary';
                case LoaderResource.XHR_RESPONSE_TYPE.BLOB:
                    return 'application/blob';
                case LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT:
                    return 'application/xml';
                case LoaderResource.XHR_RESPONSE_TYPE.JSON:
                    return 'application/json';
                case LoaderResource.XHR_RESPONSE_TYPE.DEFAULT:
                case LoaderResource.XHR_RESPONSE_TYPE.TEXT:
                /* falls through */
                default:
                    return 'text/plain';
            }
        };
        return LoaderResource;
    }());
    // eslint-disable-next-line @typescript-eslint/no-namespace
    (function (LoaderResource) {
        /**
         * The types of resources a resource could represent.
         * @static
         * @readonly
         * @enum {number}
         * @memberof PIXI.LoaderResource
         */
        var STATUS_FLAGS;
        (function (STATUS_FLAGS) {
            /** None */
            STATUS_FLAGS[STATUS_FLAGS["NONE"] = 0] = "NONE";
            /** Data URL */
            STATUS_FLAGS[STATUS_FLAGS["DATA_URL"] = 1] = "DATA_URL";
            /** Complete */
            STATUS_FLAGS[STATUS_FLAGS["COMPLETE"] = 2] = "COMPLETE";
            /** Loading */
            STATUS_FLAGS[STATUS_FLAGS["LOADING"] = 4] = "LOADING";
        })(STATUS_FLAGS = LoaderResource.STATUS_FLAGS || (LoaderResource.STATUS_FLAGS = {}));
        /**
         * The types of resources a resource could represent.
         * @static
         * @readonly
         * @enum {number}
         * @memberof PIXI.LoaderResource
         */
        var TYPE;
        (function (TYPE) {
            /** Unknown */
            TYPE[TYPE["UNKNOWN"] = 0] = "UNKNOWN";
            /** JSON */
            TYPE[TYPE["JSON"] = 1] = "JSON";
            /** XML */
            TYPE[TYPE["XML"] = 2] = "XML";
            /** Image */
            TYPE[TYPE["IMAGE"] = 3] = "IMAGE";
            /** Audio */
            TYPE[TYPE["AUDIO"] = 4] = "AUDIO";
            /** Video */
            TYPE[TYPE["VIDEO"] = 5] = "VIDEO";
            /** Plain text */
            TYPE[TYPE["TEXT"] = 6] = "TEXT";
        })(TYPE = LoaderResource.TYPE || (LoaderResource.TYPE = {}));
        /**
         * The types of loading a resource can use.
         * @static
         * @readonly
         * @enum {number}
         * @memberof PIXI.LoaderResource
         */
        var LOAD_TYPE;
        (function (LOAD_TYPE) {
            /** Uses XMLHttpRequest to load the resource. */
            LOAD_TYPE[LOAD_TYPE["XHR"] = 1] = "XHR";
            /** Uses an `Image` object to load the resource. */
            LOAD_TYPE[LOAD_TYPE["IMAGE"] = 2] = "IMAGE";
            /** Uses an `Audio` object to load the resource. */
            LOAD_TYPE[LOAD_TYPE["AUDIO"] = 3] = "AUDIO";
            /** Uses a `Video` object to load the resource. */
            LOAD_TYPE[LOAD_TYPE["VIDEO"] = 4] = "VIDEO";
        })(LOAD_TYPE = LoaderResource.LOAD_TYPE || (LoaderResource.LOAD_TYPE = {}));
        /**
         * The XHR ready states, used internally.
         * @static
         * @readonly
         * @enum {string}
         * @memberof PIXI.LoaderResource
         */
        var XHR_RESPONSE_TYPE;
        (function (XHR_RESPONSE_TYPE) {
            /** string */
            XHR_RESPONSE_TYPE["DEFAULT"] = "text";
            /** ArrayBuffer */
            XHR_RESPONSE_TYPE["BUFFER"] = "arraybuffer";
            /** Blob */
            XHR_RESPONSE_TYPE["BLOB"] = "blob";
            /** Document */
            XHR_RESPONSE_TYPE["DOCUMENT"] = "document";
            /** Object */
            XHR_RESPONSE_TYPE["JSON"] = "json";
            /** String */
            XHR_RESPONSE_TYPE["TEXT"] = "text";
        })(XHR_RESPONSE_TYPE = LoaderResource.XHR_RESPONSE_TYPE || (LoaderResource.XHR_RESPONSE_TYPE = {}));
        LoaderResource._loadTypeMap = {
            // images
            gif: LoaderResource.LOAD_TYPE.IMAGE,
            png: LoaderResource.LOAD_TYPE.IMAGE,
            bmp: LoaderResource.LOAD_TYPE.IMAGE,
            jpg: LoaderResource.LOAD_TYPE.IMAGE,
            jpeg: LoaderResource.LOAD_TYPE.IMAGE,
            tif: LoaderResource.LOAD_TYPE.IMAGE,
            tiff: LoaderResource.LOAD_TYPE.IMAGE,
            webp: LoaderResource.LOAD_TYPE.IMAGE,
            tga: LoaderResource.LOAD_TYPE.IMAGE,
            avif: LoaderResource.LOAD_TYPE.IMAGE,
            svg: LoaderResource.LOAD_TYPE.IMAGE,
            'svg+xml': LoaderResource.LOAD_TYPE.IMAGE,
            // audio
            mp3: LoaderResource.LOAD_TYPE.AUDIO,
            ogg: LoaderResource.LOAD_TYPE.AUDIO,
            wav: LoaderResource.LOAD_TYPE.AUDIO,
            // videos
            mp4: LoaderResource.LOAD_TYPE.VIDEO,
            webm: LoaderResource.LOAD_TYPE.VIDEO,
        };
        LoaderResource._xhrTypeMap = {
            // xml
            xhtml: LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT,
            html: LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT,
            htm: LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT,
            xml: LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT,
            tmx: LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT,
            svg: LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT,
            // This was added to handle Tiled Tileset XML, but .tsx is also a TypeScript React Component.
            // Since it is way less likely for people to be loading TypeScript files instead of Tiled files,
            // this should probably be fine.
            tsx: LoaderResource.XHR_RESPONSE_TYPE.DOCUMENT,
            // images
            gif: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            png: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            bmp: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            jpg: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            jpeg: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            tif: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            tiff: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            webp: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            tga: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            avif: LoaderResource.XHR_RESPONSE_TYPE.BLOB,
            // json
            json: LoaderResource.XHR_RESPONSE_TYPE.JSON,
            // text
            text: LoaderResource.XHR_RESPONSE_TYPE.TEXT,
            txt: LoaderResource.XHR_RESPONSE_TYPE.TEXT,
            // fonts
            ttf: LoaderResource.XHR_RESPONSE_TYPE.BUFFER,
            otf: LoaderResource.XHR_RESPONSE_TYPE.BUFFER,
        };
        // We can't set the `src` attribute to empty string, so on abort we set it to this 1px transparent gif
        LoaderResource.EMPTY_GIF = 'data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==';
    })(exports.LoaderResource || (exports.LoaderResource = {}));

    /**
     * Smaller version of the async library constructs.
     * @ignore
     */
    function _noop() {
    }
    /**
     * Ensures a function is only called once.
     * @ignore
     * @param {Function} fn - The function to wrap.
     * @returns {Function} The wrapping function.
     */
    function onlyOnce(fn) {
        return function onceWrapper() {
            var arguments$1 = arguments;

            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i] = arguments$1[_i];
            }
            if (fn === null) {
                throw new Error('Callback was already called.');
            }
            var callFn = fn;
            fn = null;
            callFn.apply(this, args);
        };
    }
    /**
     * @private
     * @memberof PIXI
     */
    var AsyncQueueItem = /** @class */ (function () {
        /**
         * @param data
         * @param callback
         * @private
         */
        function AsyncQueueItem(data, callback) {
            this.data = data;
            this.callback = callback;
        }
        return AsyncQueueItem;
    }());
    /**
     * @private
     * @memberof PIXI
     */
    var AsyncQueue = /** @class */ (function () {
        /**
         * @param worker
         * @param concurrency
         * @private
         */
        function AsyncQueue(worker, concurrency) {
            var _this = this;
            if (concurrency === void 0) { concurrency = 1; }
            this.workers = 0;
            this.saturated = _noop;
            this.unsaturated = _noop;
            this.empty = _noop;
            this.drain = _noop;
            this.error = _noop;
            this.started = false;
            this.paused = false;
            this._tasks = [];
            this._insert = function (data, insertAtFront, callback) {
                if (callback && typeof callback !== 'function') {
                    throw new Error('task callback must be a function');
                }
                _this.started = true;
                // eslint-disable-next-line no-eq-null,eqeqeq
                if (data == null && _this.idle()) {
                    // call drain immediately if there are no tasks
                    setTimeout(function () { return _this.drain(); }, 1);
                    return;
                }
                var item = new AsyncQueueItem(data, typeof callback === 'function' ? callback : _noop);
                if (insertAtFront) {
                    _this._tasks.unshift(item);
                }
                else {
                    _this._tasks.push(item);
                }
                setTimeout(_this.process, 1);
            };
            this.process = function () {
                while (!_this.paused && _this.workers < _this.concurrency && _this._tasks.length) {
                    var task = _this._tasks.shift();
                    if (_this._tasks.length === 0) {
                        _this.empty();
                    }
                    _this.workers += 1;
                    if (_this.workers === _this.concurrency) {
                        _this.saturated();
                    }
                    _this._worker(task.data, onlyOnce(_this._next(task)));
                }
            };
            this._worker = worker;
            if (concurrency === 0) {
                throw new Error('Concurrency must not be zero');
            }
            this.concurrency = concurrency;
            this.buffer = concurrency / 4.0;
        }
        /**
         * @param task
         * @private
         */
        AsyncQueue.prototype._next = function (task) {
            var _this = this;
            return function () {
                var arguments$1 = arguments;

                var args = [];
                for (var _i = 0; _i < arguments.length; _i++) {
                    args[_i] = arguments$1[_i];
                }
                _this.workers -= 1;
                task.callback.apply(task, args);
                // eslint-disable-next-line no-eq-null,eqeqeq
                if (args[0] != null) {
                    _this.error(args[0], task.data);
                }
                if (_this.workers <= (_this.concurrency - _this.buffer)) {
                    _this.unsaturated();
                }
                if (_this.idle()) {
                    _this.drain();
                }
                _this.process();
            };
        };
        // That was in object
        // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
        AsyncQueue.prototype.push = function (data, callback) {
            this._insert(data, false, callback);
        };
        AsyncQueue.prototype.kill = function () {
            this.workers = 0;
            this.drain = _noop;
            this.started = false;
            this._tasks = [];
        };
        // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
        AsyncQueue.prototype.unshift = function (data, callback) {
            this._insert(data, true, callback);
        };
        AsyncQueue.prototype.length = function () {
            return this._tasks.length;
        };
        AsyncQueue.prototype.running = function () {
            return this.workers;
        };
        AsyncQueue.prototype.idle = function () {
            return this._tasks.length + this.workers === 0;
        };
        AsyncQueue.prototype.pause = function () {
            if (this.paused === true) {
                return;
            }
            this.paused = true;
        };
        AsyncQueue.prototype.resume = function () {
            if (this.paused === false) {
                return;
            }
            this.paused = false;
            // Need to call this.process once per concurrent
            // worker to preserve full concurrency after pause
            for (var w = 1; w <= this.concurrency; w++) {
                this.process();
            }
        };
        /**
         * Iterates an array in series.
         * @param {Array.<*>} array - Array to iterate.
         * @param {Function} iterator - Function to call for each element.
         * @param {Function} callback - Function to call when done, or on error.
         * @param {boolean} [deferNext=false] - Break synchronous each loop by calling next with a setTimeout of 1.
         */
        AsyncQueue.eachSeries = function (array, iterator, callback, deferNext) {
            var i = 0;
            var len = array.length;
            function next(err) {
                if (err || i === len) {
                    if (callback) {
                        callback(err);
                    }
                    return;
                }
                if (deferNext) {
                    setTimeout(function () {
                        iterator(array[i++], next);
                    }, 1);
                }
                else {
                    iterator(array[i++], next);
                }
            }
            next();
        };
        /**
         * Async queue implementation,
         * @param {Function} worker - The worker function to call for each task.
         * @param {number} concurrency - How many workers to run in parrallel.
         * @returns {*} The async queue object.
         */
        AsyncQueue.queue = function (worker, concurrency) {
            return new AsyncQueue(worker, concurrency);
        };
        return AsyncQueue;
    }());

    // some constants
    var MAX_PROGRESS = 100;
    var rgxExtractUrlHash = /(#[\w-]+)?$/;
    /**
     * The new loader, forked from Resource Loader by Chad Engler: https://github.com/englercj/resource-loader
     *
     * ```js
     * const loader = PIXI.Loader.shared; // PixiJS exposes a premade instance for you to use.
     * // or
     * const loader = new PIXI.Loader(); // You can also create your own if you want
     *
     * const sprites = {};
     *
     * // Chainable `add` to enqueue a resource
     * loader.add('bunny', 'data/bunny.png')
     *       .add('spaceship', 'assets/spritesheet.json');
     * loader.add('scoreFont', 'assets/score.fnt');
     *
     * // Chainable `pre` to add a middleware that runs for each resource, *before* loading that resource.
     * // This is useful to implement custom caching modules (using filesystem, indexeddb, memory, etc).
     * loader.pre(cachingMiddleware);
     *
     * // Chainable `use` to add a middleware that runs for each resource, *after* loading that resource.
     * // This is useful to implement custom parsing modules (like spritesheet parsers, spine parser, etc).
     * loader.use(parsingMiddleware);
     *
     * // The `load` method loads the queue of resources, and calls the passed in callback called once all
     * // resources have loaded.
     * loader.load((loader, resources) => {
     *     // resources is an object where the key is the name of the resource loaded and the value is the resource object.
     *     // They have a couple default properties:
     *     // - `url`: The URL that the resource was loaded from
     *     // - `error`: The error that happened when trying to load (if any)
     *     // - `data`: The raw data that was loaded
     *     // also may contain other properties based on the middleware that runs.
     *     sprites.bunny = new PIXI.TilingSprite(resources.bunny.texture);
     *     sprites.spaceship = new PIXI.TilingSprite(resources.spaceship.texture);
     *     sprites.scoreFont = new PIXI.TilingSprite(resources.scoreFont.texture);
     * });
     *
     * // throughout the process multiple signals can be dispatched.
     * loader.onProgress.add(() => {}); // called once per loaded/errored file
     * loader.onError.add(() => {}); // called once per errored file
     * loader.onLoad.add(() => {}); // called once per loaded file
     * loader.onComplete.add(() => {}); // called once when the queued resources all load.
     * ```
     * @memberof PIXI
     */
    var Loader = /** @class */ (function () {
        /**
         * @param baseUrl - The base url for all resources loaded by this loader.
         * @param concurrency - The number of resources to load concurrently.
         */
        function Loader(baseUrl, concurrency) {
            var _this = this;
            if (baseUrl === void 0) { baseUrl = ''; }
            if (concurrency === void 0) { concurrency = 10; }
            /** The progress percent of the loader going through the queue. */
            this.progress = 0;
            /** Loading state of the loader, true if it is currently loading resources. */
            this.loading = false;
            /**
             * A querystring to append to every URL added to the loader.
             *
             * This should be a valid query string *without* the question-mark (`?`). The loader will
             * also *not* escape values for you. Make sure to escape your parameters with
             * [`encodeURIComponent`](https://mdn.io/encodeURIComponent) before assigning this property.
             * @example
             * const loader = new Loader();
             *
             * loader.defaultQueryString = 'user=me&password=secret';
             *
             * // This will request 'image.png?user=me&password=secret'
             * loader.add('image.png').load();
             *
             * loader.reset();
             *
             * // This will request 'image.png?v=1&user=me&password=secret'
             * loader.add('iamge.png?v=1').load();
             */
            this.defaultQueryString = '';
            /** The middleware to run before loading each resource. */
            this._beforeMiddleware = [];
            /** The middleware to run after loading each resource. */
            this._afterMiddleware = [];
            /** The tracks the resources we are currently completing parsing for. */
            this._resourcesParsing = [];
            /**
             * The `_loadResource` function bound with this object context.
             * @param r - The resource to load
             * @param d - The dequeue function
             */
            this._boundLoadResource = function (r, d) { return _this._loadResource(r, d); };
            /** All the resources for this loader keyed by name. */
            this.resources = {};
            this.baseUrl = baseUrl;
            this._beforeMiddleware = [];
            this._afterMiddleware = [];
            this._resourcesParsing = [];
            this._boundLoadResource = function (r, d) { return _this._loadResource(r, d); };
            this._queue = AsyncQueue.queue(this._boundLoadResource, concurrency);
            this._queue.pause();
            this.resources = {};
            this.onProgress = new Signal();
            this.onError = new Signal();
            this.onLoad = new Signal();
            this.onStart = new Signal();
            this.onComplete = new Signal();
            for (var i = 0; i < Loader._plugins.length; ++i) {
                var plugin = Loader._plugins[i];
                var pre = plugin.pre, use = plugin.use;
                if (pre) {
                    this.pre(pre);
                }
                if (use) {
                    this.use(use);
                }
            }
            this._protected = false;
        }
        /**
         * Same as add, params have strict order
         * @private
         * @param name - The name of the resource to load.
         * @param url - The url for this resource, relative to the baseUrl of this loader.
         * @param options - The options for the load.
         * @param callback - Function to call when this specific resource completes loading.
         * @returns The loader itself.
         */
        Loader.prototype._add = function (name, url, options, callback) {
            // if loading already you can only add resources that have a parent.
            if (this.loading && (!options || !options.parentResource)) {
                throw new Error('Cannot add resources while the loader is running.');
            }
            // check if resource already exists.
            if (this.resources[name]) {
                throw new Error("Resource named \"" + name + "\" already exists.");
            }
            // add base url if this isn't an absolute url
            url = this._prepareUrl(url);
            // create the store the resource
            this.resources[name] = new exports.LoaderResource(name, url, options);
            if (typeof callback === 'function') {
                this.resources[name].onAfterMiddleware.once(callback);
            }
            // if actively loading, make sure to adjust progress chunks for that parent and its children
            if (this.loading) {
                var parent = options.parentResource;
                var incompleteChildren = [];
                for (var i = 0; i < parent.children.length; ++i) {
                    if (!parent.children[i].isComplete) {
                        incompleteChildren.push(parent.children[i]);
                    }
                }
                var fullChunk = parent.progressChunk * (incompleteChildren.length + 1); // +1 for parent
                var eachChunk = fullChunk / (incompleteChildren.length + 2); // +2 for parent & new child
                parent.children.push(this.resources[name]);
                parent.progressChunk = eachChunk;
                for (var i = 0; i < incompleteChildren.length; ++i) {
                    incompleteChildren[i].progressChunk = eachChunk;
                }
                this.resources[name].progressChunk = eachChunk;
            }
            // add the resource to the queue
            this._queue.push(this.resources[name]);
            return this;
        };
        /* eslint-enable require-jsdoc,valid-jsdoc */
        /**
         * Sets up a middleware function that will run *before* the
         * resource is loaded.
         * @param fn - The middleware function to register.
         * @returns The loader itself.
         */
        Loader.prototype.pre = function (fn) {
            this._beforeMiddleware.push(fn);
            return this;
        };
        /**
         * Sets up a middleware function that will run *after* the
         * resource is loaded.
         * @param fn - The middleware function to register.
         * @returns The loader itself.
         */
        Loader.prototype.use = function (fn) {
            this._afterMiddleware.push(fn);
            return this;
        };
        /**
         * Resets the queue of the loader to prepare for a new load.
         * @returns The loader itself.
         */
        Loader.prototype.reset = function () {
            this.progress = 0;
            this.loading = false;
            this._queue.kill();
            this._queue.pause();
            // abort all resource loads
            for (var k in this.resources) {
                var res = this.resources[k];
                if (res._onLoadBinding) {
                    res._onLoadBinding.detach();
                }
                if (res.isLoading) {
                    res.abort('loader reset');
                }
            }
            this.resources = {};
            return this;
        };
        /**
         * Starts loading the queued resources.
         * @param cb - Optional callback that will be bound to the `complete` event.
         * @returns The loader itself.
         */
        Loader.prototype.load = function (cb) {
            utils.deprecation('6.5.0', '@pixi/loaders is being replaced with @pixi/assets in the next major release.');
            // register complete callback if they pass one
            if (typeof cb === 'function') {
                this.onComplete.once(cb);
            }
            // if the queue has already started we are done here
            if (this.loading) {
                return this;
            }
            if (this._queue.idle()) {
                this._onStart();
                this._onComplete();
            }
            else {
                // distribute progress chunks
                var numTasks = this._queue._tasks.length;
                var chunk = MAX_PROGRESS / numTasks;
                for (var i = 0; i < this._queue._tasks.length; ++i) {
                    this._queue._tasks[i].data.progressChunk = chunk;
                }
                // notify we are starting
                this._onStart();
                // start loading
                this._queue.resume();
            }
            return this;
        };
        Object.defineProperty(Loader.prototype, "concurrency", {
            /**
             * The number of resources to load concurrently.
             * @default 10
             */
            get: function () {
                return this._queue.concurrency;
            },
            set: function (concurrency) {
                this._queue.concurrency = concurrency;
            },
            enumerable: false,
            configurable: true
        });
        /**
         * Prepares a url for usage based on the configuration of this object
         * @param url - The url to prepare.
         * @returns The prepared url.
         */
        Loader.prototype._prepareUrl = function (url) {
            var parsedUrl = parseUri(url, { strictMode: true });
            var result;
            // absolute url, just use it as is.
            if (parsedUrl.protocol || !parsedUrl.path || url.indexOf('//') === 0) {
                result = url;
            }
            // if baseUrl doesn't end in slash and url doesn't start with slash, then add a slash inbetween
            else if (this.baseUrl.length
                && this.baseUrl.lastIndexOf('/') !== this.baseUrl.length - 1
                && url.charAt(0) !== '/') {
                result = this.baseUrl + "/" + url;
            }
            else {
                result = this.baseUrl + url;
            }
            // if we need to add a default querystring, there is a bit more work
            if (this.defaultQueryString) {
                var hash = rgxExtractUrlHash.exec(result)[0];
                result = result.slice(0, result.length - hash.length);
                if (result.indexOf('?') !== -1) {
                    result += "&" + this.defaultQueryString;
                }
                else {
                    result += "?" + this.defaultQueryString;
                }
                result += hash;
            }
            return result;
        };
        /**
         * Loads a single resource.
         * @param resource - The resource to load.
         * @param dequeue - The function to call when we need to dequeue this item.
         */
        Loader.prototype._loadResource = function (resource, dequeue) {
            var _this = this;
            resource._dequeue = dequeue;
            // run before middleware
            AsyncQueue.eachSeries(this._beforeMiddleware, function (fn, next) {
                fn.call(_this, resource, function () {
                    // if the before middleware marks the resource as complete,
                    // break and don't process any more before middleware
                    next(resource.isComplete ? {} : null);
                });
            }, function () {
                if (resource.isComplete) {
                    _this._onLoad(resource);
                }
                else {
                    resource._onLoadBinding = resource.onComplete.once(_this._onLoad, _this);
                    resource.load();
                }
            }, true);
        };
        /** Called once loading has started. */
        Loader.prototype._onStart = function () {
            this.progress = 0;
            this.loading = true;
            this.onStart.dispatch(this);
        };
        /** Called once each resource has loaded. */
        Loader.prototype._onComplete = function () {
            this.progress = MAX_PROGRESS;
            this.loading = false;
            this.onComplete.dispatch(this, this.resources);
        };
        /**
         * Called each time a resources is loaded.
         * @param resource - The resource that was loaded
         */
        Loader.prototype._onLoad = function (resource) {
            var _this = this;
            resource._onLoadBinding = null;
            // remove this resource from the async queue, and add it to our list of resources that are being parsed
            this._resourcesParsing.push(resource);
            resource._dequeue();
            // run all the after middleware for this resource
            AsyncQueue.eachSeries(this._afterMiddleware, function (fn, next) {
                fn.call(_this, resource, next);
            }, function () {
                resource.onAfterMiddleware.dispatch(resource);
                _this.progress = Math.min(MAX_PROGRESS, _this.progress + resource.progressChunk);
                _this.onProgress.dispatch(_this, resource);
                if (resource.error) {
                    _this.onError.dispatch(resource.error, _this, resource);
                }
                else {
                    _this.onLoad.dispatch(_this, resource);
                }
                _this._resourcesParsing.splice(_this._resourcesParsing.indexOf(resource), 1);
                // do completion check
                if (_this._queue.idle() && _this._resourcesParsing.length === 0) {
                    _this._onComplete();
                }
            }, true);
        };
        /** Destroy the loader, removes references. */
        Loader.prototype.destroy = function () {
            if (!this._protected) {
                this.reset();
            }
        };
        Object.defineProperty(Loader, "shared", {
            /** A premade instance of the loader that can be used to load resources. */
            get: function () {
                var shared = Loader._shared;
                if (!shared) {
                    shared = new Loader();
                    shared._protected = true;
                    Loader._shared = shared;
                }
                return shared;
            },
            enumerable: false,
            configurable: true
        });
        /**
         * Use the {@link PIXI.extensions.add} API to register plugins.
         * @deprecated since 6.5.0
         * @param plugin - The plugin to add
         * @returns Reference to PIXI.Loader for chaining
         */
        Loader.registerPlugin = function (plugin) {
            utils.deprecation('6.5.0', 'Loader.registerPlugin() is deprecated, use extensions.add() instead.');
            core.extensions.add({
                type: core.ExtensionType.Loader,
                ref: plugin,
            });
            return Loader;
        };
        Loader._plugins = [];
        return Loader;
    }());
    core.extensions.handleByList(core.ExtensionType.Loader, Loader._plugins);
    Loader.prototype.add = function add(name, url, options, callback) {
        // special case of an array of objects or urls
        if (Array.isArray(name)) {
            for (var i = 0; i < name.length; ++i) {
                this.add(name[i]);
            }
            return this;
        }
        // if an object is passed instead of params
        if (typeof name === 'object') {
            options = name;
            callback = url || options.callback || options.onComplete;
            url = options.url;
            name = options.name || options.key || options.url;
        }
        // case where no name is passed shift all args over by one.
        if (typeof url !== 'string') {
            callback = options;
            options = url;
            url = name;
        }
        // now that we shifted make sure we have a proper url.
        if (typeof url !== 'string') {
            throw new Error('No url passed to add resource to loader.');
        }
        // options are optional so people might pass a function and no options
        if (typeof options === 'function') {
            callback = options;
            options = null;
        }
        return this._add(name, url, options, callback);
    };

    /**
     * Application plugin for supporting loader option. Installing the LoaderPlugin
     * is not necessary if using **pixi.js** or **pixi.js-legacy**.
     * @example
     * import {AppLoaderPlugin} from '@pixi/loaders';
     * import {extensions} from '@pixi/core';
     * extensions.add(AppLoaderPlugin);
     * @memberof PIXI
     */
    var AppLoaderPlugin = /** @class */ (function () {
        function AppLoaderPlugin() {
        }
        /**
         * Called on application constructor
         * @param options
         * @private
         */
        AppLoaderPlugin.init = function (options) {
            options = Object.assign({
                sharedLoader: false,
            }, options);
            this.loader = options.sharedLoader ? Loader.shared : new Loader();
        };
        /**
         * Called when application destroyed
         * @private
         */
        AppLoaderPlugin.destroy = function () {
            if (this.loader) {
                this.loader.destroy();
                this.loader = null;
            }
        };
        /** @ignore */
        AppLoaderPlugin.extension = core.ExtensionType.Application;
        return AppLoaderPlugin;
    }());

    /**
     * Loader plugin for handling Texture resources.
     * @memberof PIXI
     */
    var TextureLoader = /** @class */ (function () {
        function TextureLoader() {
        }
        /** Handle SVG elements a text, render with SVGResource. */
        TextureLoader.add = function () {
            exports.LoaderResource.setExtensionLoadType('svg', exports.LoaderResource.LOAD_TYPE.XHR);
            exports.LoaderResource.setExtensionXhrType('svg', exports.LoaderResource.XHR_RESPONSE_TYPE.TEXT);
        };
        /**
         * Called after a resource is loaded.
         * @see PIXI.Loader.loaderMiddleware
         * @param resource
         * @param {Function} next
         */
        TextureLoader.use = function (resource, next) {
            // create a new texture if the data is an Image object
            if (resource.data && (resource.type === exports.LoaderResource.TYPE.IMAGE || resource.extension === 'svg')) {
                var data = resource.data, url = resource.url, name = resource.name, metadata = resource.metadata;
                core.Texture.fromLoader(data, url, name, metadata).then(function (texture) {
                    resource.texture = texture;
                    next();
                })
                    // TODO: handle errors in Texture.fromLoader
                    // so we can pass them to the Loader
                    .catch(next);
            }
            else {
                next();
            }
        };
        /** @ignore */
        TextureLoader.extension = core.ExtensionType.Loader;
        return TextureLoader;
    }());

    // a simple in-memory cache for resources
    var cache = {};
    /**
     * A simple in-memory cache for resource.
     * @ignore
     * @function caching
     * @example
     * import { Loader, middleware } from 'resource-loader';
     * const loader = new Loader();
     * loader.use(middleware.caching);
     * @param resource - Current Resource
     * @param next - Callback when complete
     */
    function caching(resource, next) {
        // if cached, then set data and complete the resource
        if (cache[resource.url]) {
            resource.data = cache[resource.url];
            resource.complete(); // marks resource load complete and stops processing before middlewares
        }
        // if not cached, wait for complete and store it in the cache.
        else {
            resource.onComplete.once(function doCache() { cache[this.url] = this.data; });
        }
        next();
    }

    var _keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
    /**
     * Encodes binary into base64.
     * @function encodeBinary
     * @param {string} input - The input data to encode.
     * @returns {string} The encoded base64 string
     */
    function encodeBinary(input) {
        var output = '';
        var inx = 0;
        while (inx < input.length) {
            // Fill byte buffer array
            var bytebuffer = [0, 0, 0];
            var encodedCharIndexes = [0, 0, 0, 0];
            for (var jnx = 0; jnx < bytebuffer.length; ++jnx) {
                if (inx < input.length) {
                    // throw away high-order byte, as documented at:
                    // https://developer.mozilla.org/En/Using_XMLHttpRequest#Handling_binary_data
                    bytebuffer[jnx] = input.charCodeAt(inx++) & 0xff;
                }
                else {
                    bytebuffer[jnx] = 0;
                }
            }
            // Get each encoded character, 6 bits at a time
            // index 1: first 6 bits
            encodedCharIndexes[0] = bytebuffer[0] >> 2;
            // index 2: second 6 bits (2 least significant bits from input byte 1 + 4 most significant bits from byte 2)
            encodedCharIndexes[1] = ((bytebuffer[0] & 0x3) << 4) | (bytebuffer[1] >> 4);
            // index 3: third 6 bits (4 least significant bits from input byte 2 + 2 most significant bits from byte 3)
            encodedCharIndexes[2] = ((bytebuffer[1] & 0x0f) << 2) | (bytebuffer[2] >> 6);
            // index 3: forth 6 bits (6 least significant bits from input byte 3)
            encodedCharIndexes[3] = bytebuffer[2] & 0x3f;
            // Determine whether padding happened, and adjust accordingly
            var paddingBytes = inx - (input.length - 1);
            switch (paddingBytes) {
                case 2:
                    // Set last 2 characters to padding char
                    encodedCharIndexes[3] = 64;
                    encodedCharIndexes[2] = 64;
                    break;
                case 1:
                    // Set last character to padding char
                    encodedCharIndexes[3] = 64;
                    break;
                default:
                    break; // No padding - proceed
            }
            // Now we will grab each appropriate character out of our keystring
            // based on our index array and append it to the output string
            for (var jnx = 0; jnx < encodedCharIndexes.length; ++jnx) {
                output += _keyStr.charAt(encodedCharIndexes[jnx]);
            }
        }
        return output;
    }

    /**
     * A middleware for transforming XHR loaded Blobs into more useful objects
     * @ignore
     * @function parsing
     * @example
     * import { Loader, middleware } from 'resource-loader';
     * const loader = new Loader();
     * loader.use(middleware.parsing);
     * @param resource - Current Resource
     * @param next - Callback when complete
     */
    function parsing(resource, next) {
        if (!resource.data) {
            next();
            return;
        }
        // if this was an XHR load of a blob
        if (resource.xhr && resource.xhrType === exports.LoaderResource.XHR_RESPONSE_TYPE.BLOB) {
            // if there is no blob support we probably got a binary string back
            if (!self.Blob || typeof resource.data === 'string') {
                var type = resource.xhr.getResponseHeader('content-type');
                // this is an image, convert the binary string into a data url
                if (type && type.indexOf('image') === 0) {
                    resource.data = new Image();
                    resource.data.src = "data:" + type + ";base64," + encodeBinary(resource.xhr.responseText);
                    resource.type = exports.LoaderResource.TYPE.IMAGE;
                    // wait until the image loads and then callback
                    resource.data.onload = function () {
                        resource.data.onload = null;
                        next();
                    };
                    // next will be called on load
                    return;
                }
            }
            // if content type says this is an image, then we should transform the blob into an Image object
            else if (resource.data.type.indexOf('image') === 0) {
                var Url_1 = globalThis.URL || globalThis.webkitURL;
                var src_1 = Url_1.createObjectURL(resource.data);
                resource.blob = resource.data;
                resource.data = new Image();
                resource.data.src = src_1;
                resource.type = exports.LoaderResource.TYPE.IMAGE;
                // cleanup the no longer used blob after the image loads
                // TODO: Is this correct? Will the image be invalid after revoking?
                resource.data.onload = function () {
                    Url_1.revokeObjectURL(src_1);
                    resource.data.onload = null;
                    next();
                };
                // next will be called on load.
                return;
            }
        }
        next();
    }

    /**
     * Parse any blob into more usable objects (e.g. Image).
     * @memberof PIXI
     */
    var ParsingLoader = /** @class */ (function () {
        function ParsingLoader() {
        }
        /** @ignore */
        ParsingLoader.extension = core.ExtensionType.Loader;
        ParsingLoader.use = parsing;
        return ParsingLoader;
    }());

    core.extensions.add(TextureLoader, ParsingLoader);

    exports.AppLoaderPlugin = AppLoaderPlugin;
    exports.Loader = Loader;
    exports.TextureLoader = TextureLoader;

    Object.defineProperty(exports, '__esModule', { value: true });

    return exports;

})({}, PIXI, PIXI.utils);
Object.assign(this.PIXI, _pixi_loaders);
//# sourceMappingURL=loaders.js.map