https://www.educative.io/static/_next/static/chunks/238613-10ee826f2e655403.js

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n=t.length,r=e.length;if(0==n||0==r)return 0;n>r?t=t.substring(n-r):n<r&&(e=e.substring(0,n));var i=Math.min(n,r);if(t==e)return i;for(var s=0,o=1;;){var h=t.substring(i-o),a=e.indexOf(h);if(-1==a)return s;o+=a,(0==a||t.substring(i-o)==e.substring(0,o))&&(s=o,o++)}},e.prototype.diff_halfMatch_=function(t,e){if(this.Diff_Timeout<=0)return null;var n,r,i,s,o,h=t.length>e.length?t:e,a=t.length>e.length?e:t;if(h.length<4||2*a.length<h.length)return null;var f=this;function l(t,e,n){for(var r,i,s,o,h=t.substring(n,n+Math.floor(t.length/4)),a=-1,l="";-1!=(a=e.indexOf(h,a+1));){var c=f.diff_commonPrefix(t.substring(n),e.substring(a)),u=f.diff_commonSuffix(t.substring(0,n),e.substring(0,a));l.length<u+c&&(l=e.substring(a-u,a)+e.substring(a,a+c),r=t.substring(0,n-u),i=t.substring(n+c),s=e.substring(0,a-u),o=e.substring(a+c))}return 2*l.length>=t.length?[r,i,s,o,l]:null}var c=l(h,a,Math.ceil(h.length/4)),u=l(h,a,Math.ceil(h.length/2));return 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g=n(i,s)+n(s,o);g>=u&&(u=g,f=i,l=s,c=o)}t[r-1][1]!=f&&(f?t[r-1][1]=f:(t.splice(r-1,1),r--),t[r][1]=l,c?t[r+1][1]=c:(t.splice(r+1,1),r--))}r++}}

1,e.nonAlphaNumericRegex_=/[^a-zA-Z0-9]/,e.whitespaceRegex_=/\s/,e.linebreakRegex_=/[\r\n]/,e.blanklineEndRegex_=/\n\r?\n$/,e.blanklineStartRegex_=/^\r?\n\r?\n/,e.prototype.diff_cleanupEfficiency=function(t){for(var n=!1,r=[],i=0,s=null,o=0,h=!1,a=!1,f=!1,l=!1;o<t.length;)0==t[o][0]?(t[o][1].length<this.Diff_EditCost&&(f||l)?(r[i++]=o,h=f,a=l,s=t[o][1]):(i=0,s=null),f=l=!1):(-1==t[o][0]?l=!0:f=!0,s&&(h&&a&&f&&l||s.length<this.Diff_EditCost/2&&h+a+f+l==3)&&(t.splice(r[i-1],0,new e.Diff(-1,s)),t[r[i-1]+1][0]=1,i--,s=null,h&&a?(f=l=!0,i=0):(o=--i>0?r[i-1]:-1,f=l=!1),n=!0)),o++;n&&this.diff_cleanupMerge(t)},e.prototype.diff_cleanupMerge=function(t){t.push(new e.Diff(0,""));for(var n,r=0,i=0,s=0,o="",h="";r<t.length;)switch(t[r][0]){case 1:s++,h+=t[r][1],r++;break;case -1:i++,o+=t[r][1],r++;break;case 0:i+s>1?(0!==i&&0!==s&&(0!==(n=this.diff_commonPrefix(h,o))&&(r-i-s>0&&0==t[r-i-s-1][0]?t[r-i-s-1][1]+=h.substring(0,n):(t.splice(0,0,new e.Diff(0,h.substring(0,n))),r++),h=h.substring(n),o=o.substring(n)),0!==(n=this.diff_commonSuffix(h,o))&&(t[r][1]=h.substring(h.length-n)+t[r][1],h=h.substring(0,h.length-n),o=o.substring(0,o.length-n))),r-=i+s,t.splice(r,i+s),o.length&&(t.splice(r,0,new e.Diff(-1,o)),r++),h.length&&(t.splice(r,0,new e.Diff(1,h)),r++),r++):0!==r&&0==t[r-1][0]?(t[r-1][1]+=t[r][1],t.splice(r,1)):r++,s=0,i=0,o="",h=""}""===t[t.length-1][1]&&t.pop();var a=!1;for(r=1;r<t.length-1;)0==t[r-1][0]&&0==t[r+1][0]&&(t[r][1].substring(t[r][1].length-t[r-1][1].length)==t[r-1][1]?(t[r][1]=t[r-1][1]+t[r][1].substring(0,t[r][1].length-t[r-1][1].length),t[r+1][1]=t[r-1][1]+t[r+1][1],t.splice(r-1,1),a=!0):t[r][1].substring(0,t[r+1][1].length)==t[r+1][1]&&(t[r-1][1]+=t[r+1][1],t[r][1]=t[r][1].substring(t[r+1][1].length)+t[r+1][1],t.splice(r+1,1),a=!0)),r++;a&&this.diff_cleanupMerge(t)},e.prototype.diff_xIndex=function(t,e){var n,r=0,i=0,s=0,o=0;for(n=0;n<t.length&&(1!==t[n][0]&&(r+=t[n][1].length),-1!==t[n][0]&&(i+=t[n][1].length),!(r>e));n++)s=r,o=i;return t.length!=n&&-1===t[n][0]?o:o+(e-s)},e.prototype.diff_prettyHtml=function(t){for(var e=[],n=/&/g,r=/</g,i=/>/g,s=/\n/g,o=0;o<t.length;o++){var h=t[o][0],a=t[o][1].replace(n,"&amp;").replace(r,"&lt;").replace(i,"&gt;").replace(s,"&para;<br>");switch(h){case 1:e[o]='<ins style="background:#e6ffe6;">'+a+"</ins>";break;case -1:e[o]='<del style="background:#ffe6e6;">'+a+"</del>";break;case 0:e[o]="<span>"+a+"</span>"}}return e.join("")},e.prototype.diff_text1=function(t){for(var e=[],n=0;n<t.length;n++)1!==t[n][0]&&(e[n]=t[n][1]);return e.join("")},e.prototype.diff_text2=function(t){for(var e=[],n=0;n<t.length;n++)-1!==t[n][0]&&(e[n]=t[n][1]);return e.join("")},e.prototype.diff_levenshtein=function(t){for(var e=0,n=0,r=0,i=0;i<t.length;i++){var s=t[i][0],o=t[i][1];switch(s){case 1:n+=o.length;break;case -1:r+=o.length;break;case 0:e+=Math.max(n,r),n=0,r=0}}return e+Math.max(n,r)},e.prototype.diff_toDelta=function(t){for(var e=[],n=0;n<t.length;n++)switch(t[n][0]){case 1:e[n]="+"+encodeURI(t[n][1]);break;case -1:e[n]="-"+t[n][1].length;break;case 0:e[n]="="+t[n][1].length}return e.join("	").replace(/%20/g," ")},e.prototype.diff_fromDelta=function(t,n){for(var r=[],i=0,s=0,o=n.split(/\t/g),h=0;h<o.length;h++){var a=o[h].substring(1);switch(o[h].charAt(0)){case"+":try{r[i++]=new e.Diff(1,decodeURI(a))}catch(t){throw Error("Illegal escape in diff_fromDelta: "+a)}break;case"-":case"=":var f=parseInt(a,10);if(isNaN(f)||f<0)throw Error("Invalid number in diff_fromDelta: "+a);var l=t.substring(s,s+=f);"="==o[h].charAt(0)?r[i++]=new e.Diff(0,l):r[i++]=new e.Diff(-1,l);break;default:if(o[h])throw Error("Invalid diff operation in diff_fromDelta: "+o[h])}}if(s!=t.length)throw Error("Delta length ("+s+") does not equal source text length ("+t.length+").");return r},e.prototype.match_main=function(t,e,n){if(null==t||null==e||null==n)throw Error("Null input. 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l},e.prototype.match_alphabet_=function(t){for(var e={},n=0;n<t.length;n++)e[t.charAt(n)]=0;for(var n=0;n<t.length;n++)e[t.charAt(n)]|=1<<t.length-n-1;return e},e.prototype.patch_addContext_=function(t,n){if(0!=n.length){if(null===t.start2)throw Error("patch not initialized");for(var r=n.substring(t.start2,t.start2+t.length1),i=0;n.indexOf(r)!=n.lastIndexOf(r)&&r.length<this.Match_MaxBits-this.Patch_Margin-this.Patch_Margin;)i+=this.Patch_Margin,r=n.substring(t.start2-i,t.start2+t.length1+i);i+=this.Patch_Margin;var s=n.substring(t.start2-i,t.start2);s&&t.diffs.unshift(new e.Diff(0,s));var o=n.substring(t.start2+t.length1,t.start2+t.length1+i);o&&t.diffs.push(new e.Diff(0,o)),t.start1-=s.length,t.start2-=s.length,t.length1+=s.length+o.length,t.length2+=s.length+o.length}},e.prototype.patch_make=function(t,n,r){if("string"==typeof t&&"string"==typeof n&&void 0===r)i=t,(s=this.diff_main(i,n,!0)).length>2&&(this.diff_cleanupSemantic(s),this.diff_cleanupEfficiency(s));else if(t&&"object"==typeof t&&void 0===n&&void 0===r)s=t,i=this.diff_text1(s);else if("string"==typeof t&&n&&"object"==typeof n&&void 0===r)i=t,s=n;else if("string"==typeof t&&"string"==typeof n&&r&&"object"==typeof r)i=t,s=r;else throw Error("Unknown call format to patch_make.");if(0===s.length)return[];for(var i,s,o=[],h=new e.patch_obj,a=0,f=0,l=0,c=i,u=i,g=0;g<s.length;g++){var _=s[g][0],p=s[g][1];switch(a||0===_||(h.start1=f,h.start2=l),_){case 1:h.diffs[a++]=s[g],h.length2+=p.length,u=u.substring(0,l)+p+u.substring(l);break;case -1:h.length1+=p.length,h.diffs[a++]=s[g],u=u.substring(0,l)+u.substring(l+p.length);break;case 0:p.length<=2*this.Patch_Margin&&a&&s.length!=g+1?(h.diffs[a++]=s[g],h.length1+=p.length,h.length2+=p.length):p.length>=2*this.Patch_Margin&&a&&(this.patch_addContext_(h,c),o.push(h),h=new e.patch_obj,a=0,c=u,f=l)}1!==_&&(f+=p.length),-1!==_&&(l+=p.length)}return a&&(this.patch_addContext_(h,c),o.push(h)),o},e.prototype.patch_deepCopy=function(t){for(var n=[],r=0;r<t.length;r++){var i=t[r],s=new e.patch_obj;s.diffs=[];for(var o=0;o<i.diffs.length;o++)s.diffs[o]=new e.Diff(i.diffs[o][0],i.diffs[o][1]);s.start1=i.start1,s.start2=i.start2,s.length1=i.length1,s.length2=i.length2,n[r]=s}return n},e.prototype.patch_apply=function(t,e){if(0==t.length)return[e,[]];t=this.patch_deepCopy(t);var n=this.patch_addPadding(t);e=n+e+n,this.patch_splitMax(t);for(var r=0,i=[],s=0;s<t.length;s++){var o=t[s].start2+r,h=this.diff_text1(t[s].diffs),a=-1;if(h.length>this.Match_MaxBits?-1!=(l=this.match_main(e,h.substring(0,this.Match_MaxBits),o))&&(-1==(a=this.match_main(e,h.substring(h.length-this.Match_MaxBits),o+h.length-this.Match_MaxBits))||l>=a)&&(l=-1):l=this.match_main(e,h,o),-1==l)i[s]=!1,r-=t[s].length2-t[s].length1;else if(i[s]=!0,r=l-o,c=-1==a?e.substring(l,l+h.length):e.substring(l,a+this.Match_MaxBits),h==c)e=e.substring(0,l)+this.diff_text2(t[s].diffs)+e.substring(l+h.length);else{var f=this.diff_main(h,c,!1);if(h.length>this.Match_MaxBits&&this.diff_levenshtein(f)/h.length>this.Patch_DeleteThreshold)i[s]=!1;else{this.diff_cleanupSemanticLossless(f);for(var l,c,u,g=0,_=0;_<t[s].diffs.length;_++){var p=t[s].diffs[_];0!==p[0]&&(u=this.diff_xIndex(f,g)),1===p[0]?e=e.substring(0,l+u)+p[1]+e.substring(l+u):-1===p[0]&&(e=e.substring(0,l+u)+e.substring(l+this.diff_xIndex(f,g+p[1].length))),-1!==p[0]&&(g+=p[1].length)}}}}return[e=e.substring(n.length,e.length-n.length),i]},e.prototype.patch_addPadding=function(t){for(var n=this.Patch_Margin,r="",i=1;i<=n;i++)r+=String.fromCharCode(i);for(var i=0;i<t.length;i++)t[i].start1+=n,t[i].start2+=n;var s=t[0],o=s.diffs;if(0==o.length||0!=o[0][0])o.unshift(new e.Diff(0,r)),s.start1-=n,s.start2-=n,s.length1+=n,s.length2+=n;else if(n>o[0][1].length){var h=n-o[0][1].length;o[0][1]=r.substring(o[0][1].length)+o[0][1],s.start1-=h,s.start2-=h,s.length1+=h,s.length2+=h}if(0==(o=(s=t[t.length-1]).diffs).length||0!=o[o.length-1][0])o.push(new e.Diff(0,r)),s.length1+=n,s.length2+=n;else if(n>o[o.length-1][1].length){var h=n-o[o.length-1][1].length;o[o.length-1][1]+=r.substring(0,h),s.length1+=h,s.length2+=h}return r},e.prototype.patch_splitMax=function(t){for(var n=this.Match_MaxBits,r=0;r<t.length;r++)if(!(t[r].length1<=n)){var i=t[r];t.splice(r--,1);for(var s=i.start1,o=i.start2,h="";

10!==i.diffs.length;){var a=new e.patch_obj,f=!0;for(a.start1=s-h.length,a.start2=o-h.length,""!==h&&(a.length1=a.length2=h.length,a.diffs.push(new e.Diff(0,h)));0!==i.diffs.length&&a.length1<n-this.Patch_Margin;){var l=i.diffs[0][0],c=i.diffs[0][1];1===l?(a.length2+=c.length,o+=c.length,a.diffs.push(i.diffs.shift()),f=!1):-1===l&&1==a.diffs.length&&0==a.diffs[0][0]&&c.length>2*n?(a.length1+=c.length,s+=c.length,f=!1,a.diffs.push(new e.Diff(l,c)),i.diffs.shift()):(c=c.substring(0,n-a.length1-this.Patch_Margin),a.length1+=c.length,s+=c.length,0===l?(a.length2+=c.length,o+=c.length):f=!1,a.diffs.push(new e.Diff(l,c)),c==i.diffs[0][1]?i.diffs.shift():i.diffs[0][1]=i.diffs[0][1].substring(c.length))}h=(h=this.diff_text2(a.diffs)).substring(h.length-this.Patch_Margin);var u=this.diff_text1(i.diffs).substring(0,this.Patch_Margin);""!==u&&(a.length1+=u.length,a.length2+=u.length,0!==a.diffs.length&&0===a.diffs[a.diffs.length-1][0]?a.diffs[a.diffs.length-1][1]+=u:a.diffs.push(new e.Diff(0,u))),f||t.splice(++r,0,a)}}},e.prototype.patch_toText=function(t){for(var e=[],n=0;n<t.length;n++)e[n]=t[n];return e.join("")},e.prototype.patch_fromText=function(t){var n=[];if(!t)return n;for(var r=t.split("\n"),i=0,s=/^@@ -(\d+),?(\d*) \+(\d+),?(\d*) @@$/;i<r.length;){var o=r[i].match(s);if(!o)throw Error("Invalid patch string: "+r[i]);var h=new e.patch_obj;for(n.push(h),h.start1=parseInt(o[1],10),""===o[2]?(h.start1--,h.length1=1):"0"==o[2]?h.length1=0:(h.start1--,h.length1=parseInt(o[2],10)),h.start2=parseInt(o[3],10),""===o[4]?(h.start2--,h.length2=1):"0"==o[4]?h.length2=0:(h.start2--,h.length2=parseInt(o[4],10)),i++;i<r.length;){var a=r[i].charAt(0);try{var f=decodeURI(r[i].substring(1))}catch(t){throw Error("Illegal escape in patch_fromText: "+f)}if("-"==a)h.diffs.push(new e.Diff(-1,f));else if("+"==a)h.diffs.push(new e.Diff(1,f));else if(" "==a)h.diffs.push(new e.Diff(0,f));else if("@"==a)break;else if(""===a);else throw Error('Invalid patch mode "'+a+'" in: '+f);i++}}return n},e.patch_obj=function(){this.diffs=[],this.start1=null,this.start2=null,this.length1=0,this.length2=0},e.patch_obj.prototype.toString=function(){t=0===this.length1?this.start1+",0":1==this.length1?this.start1+1:this.start1+1+","+this.length1;for(var t,e,n=["@@ -"+t+" +"+(0===this.length2?this.start2+",0":1==this.length2?this.start2+1:this.start2+1+","+this.length2)+" @@\n"],r=0;r<this.diffs.length;r++){switch(this.diffs[r][0]){case 1:e="+";break;case -1:e="-";break;case 0:e=" "}n[r+1]=e+encodeURI(this.diffs[r][1])+"\n"}return n.join("").replace(/%20/g," ")},t.exports=e,t.exports.diff_match_patch=e,t.exports.DIFF_DELETE=-1,t.exports.DIFF_INSERT=1,t.exports.DIFF_EQUAL=0},210568:function(t,e){"use strict";var n=function(t,e){return(n=Object.setPrototypeOf||({__proto__:[]})instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var n in e)e.hasOwnProperty(n)&&(t[n]=e[n])})(t,e)};function r(t,e){function r(){this.constructor=t}n(t,e),t.prototype=null===e?Object.create(e):(r.prototype=e.prototype,new r)}var i=function(t,e){this.target=e,this.type=t},s=function(t){function e(e,n){var r=t.call(this,"error",n)||this;return r.message=e.message,r.error=e,r}return r(e,t),e}(i),o=function(t){function e(e,n,r){void 0===e&&(e=1e3),void 0===n&&(n="");var i=t.call(this,"close",r)||this;return i.wasClean=!0,i.code=e,i.reason=n,i}return r(e,t),e}(i),h=function(){if("undefined"!=typeof WebSocket)return WebSocket},a={maxReconnectionDelay:1e4,minReconnectionDelay:1e3+4e3*Math.random(),minUptime:5e3,reconnectionDelayGrowFactor:1.3,connectionTimeout:4e3,maxRetries:1/0,maxEnqueuedMessages:1/0},f=function(){function t(t,e,n){var r=this;void 0===n&&(n={}),this._listeners={error:[],message:[],open:[],close:[]},this._retryCount=-1,this._shouldReconnect=!0,this._connectLock=!1,this._binaryType="blob",this._closeCalled=!1,this._messageQueue=[],this.onclose=null,this.onerror=null,this.onmessage=null,this.onopen=null,this._handleOpen=function(t){r._debug("open event");var e=r._options.minUptime,n=void 0===e?a.minUptime:e;clearTimeout(r._connectTimeout),r._uptimeTimeout=setTimeout(function(){return r._acceptOpen()},n),r._ws.binaryType=r._binaryType,r._messageQueue.forEach(function(t){return r._ws.send(t)}),r._messageQueue=[],r.onopen&&r.onopen(t),r._listeners.open.forEac

1h(function(e){return r._callEventListener(t,e)})},this._handleMessage=function(t){r._debug("message event"),r.onmessage&&r.onmessage(t),r._listeners.message.forEach(function(e){return r._callEventListener(t,e)})},this._handleError=function(t){r._debug("error event",t.message),r._disconnect(void 0,"TIMEOUT"===t.message?"timeout":void 0),r.onerror&&r.onerror(t),r._debug("exec error listeners"),r._listeners.error.forEach(function(e){return r._callEventListener(t,e)}),r._connect()},this._handleClose=function(t){r._debug("close event"),r._clearTimeouts(),r._shouldReconnect&&r._connect(),r.onclose&&r.onclose(t),r._listeners.close.forEach(function(e){return r._callEventListener(t,e)})},this._url=t,this._protocols=e,this._options=n,this._options.startClosed&&(this._shouldReconnect=!1),this._connect()}return Object.defineProperty(t,"CONNECTING",{get:function(){return 0},enumerable:!0,configurable:!0}),Object.defineProperty(t,"OPEN",{get:function(){return 1},enumerable:!0,configurable:!0}),Object.defineProperty(t,"CLOSING",{get:function(){return 2},enumerable:!0,configurable:!0}),Object.defineProperty(t,"CLOSED",{get:function(){return 3},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"CONNECTING",{get:function(){return t.CONNECTING},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"OPEN",{get:function(){return t.OPEN},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"CLOSING",{get:function(){return t.CLOSING},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"CLOSED",{get:function(){return t.CLOSED},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"binaryType",{get:function(){return this._ws?this._ws.binaryType:this._binaryType},set:function(t){this._binaryType=t,this._ws&&(this._ws.binaryType=t)}

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this._ws?this._ws.url:""},enumerable:!0,configurable:!0}),t.prototype.close=function(t,e){if(void 0===t&&(t=1e3),this._closeCalled=!0,this._shouldReconnect=!1,this._clearTimeouts(),!this._ws){this._debug("close enqueued: no ws instance");return}if(this._ws.readyState===this.CLOSED){this._debug("close: already closed");return}this._ws.close(t,e)},t.prototype.reconnect=function(t,e){this._shouldReconnect=!0,this._closeCalled=!1,this._retryCount=-1,this._ws&&this._ws.readyState!==this.CLOSED&&this._disconnect(t,e),this._connect()},t.prototype.send=function(t){if(this._ws&&this._ws.readyState===this.OPEN)this._debug("send",t),this._ws.send(t);else{var e=this._options.maxEnqueuedMessages,n=void 0===e?a.maxEnqueuedMessages:e;this._messageQueue.length<n&&(this._debug("enqueue",t),this._messageQueue.push(t))}},t.prototype.addEventListener=function(t,e){this._listeners[t]&&this._listeners[t].push(e)},t.prototype.dispatchEvent=function(t){var e,n,r=this._listeners[t.type];if(r)try{for(var i,s,o,h=(i=r,s="function"==typeof Symbol&&i[Symbol.iterator],o=0,s?s.call(i):{next:function(){return i&&o>=i.length&&(i=void 0),{value:i&&i[o++],done:!i}}}),a=h.next();!a.done;a=h.next()){var f=a.value;this._callEventListener(t,f)}}catch(t){e={error:t}}finally{try{a&&!a.done&&(n=h.return)&&n.call(h)}finally{if(e)throw e.error}}return!0},t.prototype.removeEventListener=function(t,e){this._listeners[t]&&(this._listeners[t]=this._listeners[t].filter(function(t){return t!==e}))},t.prototype._debug=function(){for(var t=[],e=0;e<arguments.length;e++)t[e]=arguments[e];this._options.debug&&console.log.apply(console,function(){for(var t=[],e=0;e<arguments.length;e++)t=t.concat(function(t,e){var n="function"==typeof Symbol&&t[Symbol.iterator];if(!n)return t;var r,i,s=n.call(t),o=[];try{for(;(void 0===e||e-- >0)&&!(r=s.next()).done;)o.push(r.value)}catch(t){i={error:t}}finally{try{r&&!r.done&&(n=s.return)&&n.call(s)}finally{if(i)throw i.error}}return o}(arguments[e]));return t}(["RWS>"],t))},t.prototype._getNextDelay=function(){var t=this._options,e=t.reconnectionDelayGrowFactor,n=void 0===e?a.reconnectionDelayGrowFactor:e,r=t.minReconnectionDelay,i=void 0===r?a.minReconnectionDelay:r,s=t.maxReconnectionDelay,o=void 0===s?a.maxReconnectionDelay:s,h=0;return this._retryCount>0&&(h=i*Math.pow(n,this._retryCount-1))>o&&(h=o),this._debug("next delay",h),h},t.prototype._wait=function(){var t=this;return new Promise(function(e){setTimeout(e,t._getNextDelay())})},t.prototype._getNextUrl=function(t){if("string"==typeof t)return Promise.resolve(t);if("function"==typeof t){var e=t();if("string"==typeof e)return Promise.resolve(e);if(e.then)return e}throw Error("Invalid URL")},t.prototype._connect=function(){var t=this;if(!this._connectLock&&this._shouldReconnect){this._connectLock=!0;var e=this._options,n=e.maxRetries,r=void 0===n?a.maxRetries:n,i=e.connectionTimeout,s=void 0===i?a.connectionTimeout:i,o=e.WebSocket,f=void 0===o?h():o;if(this._retryCount>=r){this._debug("max retries reached",this._retryCount,">=",r);return}if(this._retryCount++,this._debug("connect",this._retryCount),this._removeListeners(),!(void 0!==f&&f&&2===f.CLOSING))throw Error("No valid WebSocket class provided");this._wait().then(function(){return t._getNextUrl(t._url)}).then(function(e){t._closeCalled||(t._debug("connect",{url:e,protocols:t._protocols}),t._ws=t._protocols?new f(e,t._protocols):new f(e),t._ws.binaryType=t._binaryType,t._connectLock=!1,t._addListeners(),t._connectTimeout=setTimeout(function(){return t._handleTimeout()},s))})}},t.prototype._handleTimeout=function(){this._debug("timeout event"),this._handleError(new s(Error("TIMEOUT"),this))},t.prototype._disconnect=function(t,e){if(void 0===t&&(t=1e3),this._clearTimeouts(),this._ws){this._removeListeners();try{this._ws.close(t,e),this._handleClose(new o(t,e,this))}catch(t){}}},t.prototype._acceptOpen=function(){this._debug("accept open"),this._retryCount=0},t.prototype._callEventListener=function(t,e){"handleEvent"in e?e.handleEvent(t):e(t)},t.prototype._removeListeners=function(){this._ws&&(this._debug("removeListeners"),this._ws.removeEventListener("open",this._handleOpen),this._ws.removeEventListener("close",this._handleClose),this._ws.removeEventListener("message",this._handleMessage),this._ws.removeEventListener("error",this._handleError))},t.prototype._addListeners=function(){this._ws&&(this._debug("addListeners"),this._ws.addEventListener("open",this._handleOpen),this._ws.addEventListener("close",this._handleClose),this._ws.addEventListener("message",this._handleMessage),this._ws.addEventListener("error",this._handleError))},t.prototype._clearTimeouts=function(){clearTimeout(this._connectTimeout),clearTimeout(this._uptimeTimeout)},t}();e.Z=f}}]);