According to [this Github page][1] the shims include all monkey-patches that faithfully represent the ES5 features.

In other words: you can use the features provided by these files as if you were using ES5 proper.

The shams, however contain those features that can not be emulated with other code. They basically provide the API, so your code doesn&#39;t crash but they don&#39;t provide the actual functionality.

Which ones do you need? That depends on how you write your code. If you only use features provided by the shims, then include that. If you also want to (optionally) use features from the shams, then you need both of them.


  [1]: https://github.com/es-shims/es5-shim

I&#39;m trying to compile my app as assembleRelease in Android Studio 1.0.1 and get the following message:

    FAILURE: Build failed with an exception.

    * What went wrong:
    Execution failed for task &#39;:app:proguardRelease&#39;.
    &gt; java.io.IOException: Please correct the above warnings first.

The app compiles and runs perfectly in debug mode, and assembleRelease worked with Android Studio 0.8.

The `proguard-rules.pro` file is empty. The `build.gradle` file and the full error are shown below.

Anybody can help?

&lt;b&gt;build.gradle&lt;/b&gt;

    apply plugin: &#39;com.android.application&#39;

    android {
        compileSdkVersion 19
        buildToolsVersion &#39;19.1&#39;

        defaultConfig {
            applicationId &quot;com.xxx.xxx&quot;
            minSdkVersion 15
            targetSdkVersion 19
            versionCode 1
            versionName &quot;1.0&quot;
        }
        buildTypes {
            release {
                minifyEnabled true
                proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.pro&#39;
            }
        }

        lintOptions {
            abortOnError false
            absolutePaths false
            lintConfig file(&quot;lint.xml&quot;)
        }
    }

    repositories {
        mavenCentral()
        flatDir {
            dirs &#39;aars&#39;
        }
    }

    dependencies {
        compile fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
        compile &#39;com.urbanairship:urbanairship-lib:+@aar&#39;
        compile &#39;com.google.android.gms:play-services:6.1.+&#39;
        compile &#39;me.grantland:autofittextview:0.1.1@aar&#39;
        compile &#39;com.google.code.gson:gson:2.2.+&#39;
        compile &#39;net.danlew:android.joda:2.3.4@aar&#39;
        compile &#39;com.android.support:support-v4:21.0.0&#39;
        compile &#39;com.android.support:support-v13:21.0.0&#39;
        compile &#39;com.squareup.okio:okio:1.0.0@jar&#39;
        compile &#39;net.danlew:android.joda:2.4.0&#39;
        compile &#39;de.greenrobot:eventbus:2.2.1&#39;
        compile &#39;se.emilsjolander:stickylistheaders:2.5.0&#39;
        compile &#39;se.emilsjolander:StickyScrollViewItems:1.1.0&#39;
        compile &#39;com.nostra13.universalimageloader:universal-image-loader:1.9.3&#39;
        compile &#39;com.sothree.slidinguppanel:library:2.0.2&#39;
        compile &#39;com.squareup.okhttp:okhttp:2.1.0&#39;
        compile &#39;com.squareup.picasso:picasso:2.4.0&#39;
        compile &#39;com.squareup.okhttp:okhttp-urlconnection:2.1.0&#39;
        compile &#39;de.greenrobot:eventbus:2.4.0&#39;
    }

The error is

    13:40:19: Executing external task &#39;assembleRelease&#39;...
    :app:preBuild
    :app:preReleaseBuild
    :app:checkReleaseManifest
    :app:preDebugBuild
    :app:prepareComAndroidSupportSupportV132100Library UP-TO-DATE
    :app:prepareComAndroidSupportSupportV42100Library UP-TO-DATE
    :app:prepareComGoogleAndroidGmsPlayServices6171Library UP-TO-DATE
    :app:prepareComSothreeSlidinguppanelLibrary202Library UP-TO-DATE
    :app:prepareComUrbanairshipUrbanairshipLib510Library UP-TO-DATE
    :app:prepareMeGrantlandAutofittextview011Library UP-TO-DATE
    :app:prepareNetDanlewAndroidJoda240Library UP-TO-DATE
    :app:prepareSeEmilsjolanderStickyScrollViewItems110Library UP-TO-DATE
    :app:prepareSeEmilsjolanderStickylistheaders250Library UP-TO-DATE
    :app:prepareReleaseDependencies
    :app:compileReleaseAidl
    :app:compileReleaseRenderscript
    :app:generateReleaseBuildConfig
    :app:generateReleaseAssets UP-TO-DATE
    :app:mergeReleaseAssets
    :app:generateReleaseResValues UP-TO-DATE
    :app:generateReleaseResources
    :app:mergeReleaseResources
    :app:processReleaseManifest
    :app:processReleaseResources
    :app:generateReleaseSources
    Note: &lt;path_to_my_project&gt;/app/src/main/java/com/xxx/xxx/fragments/MatchCenterFragment.java uses unchecked or unsafe operations.
    Note: Recompile with -Xlint:unchecked for details.
    :app:compileReleaseJava
    :app:lintVitalRelease
    :app:compileReleaseNdk
    :app:proguardRelease
    Warning: com.ooyala.android.player.WidevineLibPlayer: can&#39;t find superclass or interface com.widevine.drmapi.android.WVEventListener
    ( more com.ooyala.* warnings )
    Warning: com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl: can&#39;t find referenced method &#39;long getContentLengthLong()&#39; in program class com.squareup.okhttp.internal.huc.HttpURLConnectionImpl
    Warning: com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl: can&#39;t find referenced method &#39;long getHeaderFieldLong(java.lang.String,long)&#39; in program class com.squareup.okhttp.internal.huc.HttpURLConnectionImpl
    Warning: com.squareup.okhttp.internal.huc.JavaApiConverter$CacheHttpsURLConnection: can&#39;t find referenced method &#39;long getContentLengthLong()&#39; in program class com.squareup.okhttp.internal.huc.JavaApiConverter$CacheHttpURLConnection
    Warning: com.squareup.okhttp.internal.huc.JavaApiConverter$CacheHttpsURLConnection: can&#39;t find referenced method &#39;long getHeaderFieldLong(java.lang.String,long)&#39; in program class com.squareup.okhttp.internal.huc.JavaApiConverter$CacheHttpURLConnection
    Warning: okio.DeflaterSink: can&#39;t find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.Files
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.Files
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.Files
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.Path
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.OpenOption
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.Path
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.OpenOption
    Warning: okio.Okio: can&#39;t find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.Path
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.OpenOption
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.Path
    Warning: okio.Okio: can&#39;t find referenced class java.nio.file.OpenOption
    Warning: okio.Okio: can&#39;t find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
    Warning: there were 234 unresolved references to classes or interfaces.
             You may need to add missing library jars or update their versions.
             If your code works fine without the missing classes, you can suppress
             the warnings with &#39;-dontwarn&#39; options.
             (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
    Warning: there were 4 unresolved references to program class members.
             Your input classes appear to be inconsistent.
             You may need to recompile the code.
             (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedprogramclassmember)
    :app:proguardRelease FAILED

    FAILURE: Build failed with an exception.

    * What went wrong:
    Execution failed for task &#39;:app:proguardRelease&#39;.
    &gt; java.io.IOException: Please correct the above warnings first.

    * Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

    BUILD FAILED

    Total time: 14.674 secs
    Please correct the above warnings first.
    13:40:35: External task execution finished &#39;assembleRelease&#39;.

proguardRelease FAILED when compiling apk with assembleRelease in Android Studio

My `User` model has many `Target` and vice versa.
Now I&#39;ve got a given `User` and given `Target` and I want to access pivot data from their relation. The pivot column is called `type`

How can I achieve this?

Laravel: Get pivot data for specific many to many relation

What is the difference between a shim an a sham?

Is it enough to include es5-shim.min.js and es6-shim.min.js or should I also include es5-sham.min.js and es6-sham.min.js?

Shim vs. Sham: What is the difference?

<p>What is the difference between a shim an a sham?</p>
<p>Is it enough to include es5-shim.min.js and es6-shim.min.js or should I also include es5-sham.min.js and es6-sham.min.js?</p>


I was trying out this really simple example from the awesome &quot;Professional JavaScript for Web Developers&quot; book by Nicholas Zakas but I can&#39;t figure what I am doing wrong here. Must be something really simple that I missed but I&#39;m stuck.

Here is the code:

    &#39;use strict&#39;;

    var book = {};
    
    Object.defineProperties(book, {
    	originYear: {
    		value: 2004,
    		writable: false
    	},
    
    	_year: {
    		value: 2004
    	},
    
    	edition: {
    		value: 1
    	},
    
    	year : {
    		get: function() {
    			return this._year;
    		},
    
    		set: function(newValue) {
    			if(newValue &gt; this.originYear) {
    				this._year = newValue;
    				this.edition += newValue - this.originYear;
    			}
    		}
    	}
    });
    
    console.log(book.edition);
    book.year = 2006;
    console.log(book.edition);

The error I am getting on the Chrome console is:

&gt; Uncaught TypeError: Cannot assign to read only property &#39;_year&#39; of
&gt; #&lt;Object&gt;main.js:31 Object.defineProperties.year.setmain.js:39 (anonymous function)

Can someone please explain where I have gone wrong?

Here is the [fiddle][1]


  [1]: http://jsfiddle.net/csssolver296/gvgf6r1a/

Uncaught TypeError: Cannot assign to read only property

Is it possible to create an Interface in TypeScript with optional function?

    interface IElement {
      name: string;
      options: any;
      type: string;
      value?: string;
      validation(any): boolean; // --&gt; should be optional.
    
    }

TypeScript Optional function in Interface

    var arrObj = [{a:1, b:2},{c:3, d:4},{e:5, f:6}];

how can i merge this into one obj?
    
    //mergedObj = {a:1, b:2, c:3, d:4, e:5, f:6}

Merge multiple objects inside the same array into one object

I have the following code for [ECMAScript 6][1] *template literals*:

    let person = {name: &#39;John Smith&#39;};
    let tpl = `My name is ${person.name}.`;
    let MyVar = &quot;My name is &quot; + person.name + &quot;.&quot;;

    console.log(&quot;template literal= &quot; + tpl);
    console.log(&quot;my variable = &quot; + MyVar);

The output is as follows:

    template literal= My name is John Smith.
    my variable = My name is John Smith.

[This][2] is the fiddle.

I tried searching for the exact difference, but I couldn&#39;t find it,
What is the difference between the following two statements?

      let tpl = `My name is ${person.name}.`;

And

      let MyVar = &quot;My name is &quot;+ person.name+&quot;.&quot;;

I am already able to get the string `MyVar` concatenated with `person.name` here, so what would be the scenario to use the template literal in?

  [1]: https://en.wikipedia.org/wiki/ECMAScript#6th_Edition_%E2%80%93_ECMAScript_2015
  [2]: http://www.es6fiddle.net/i3vgplv9/






ES6 template literals vs. concatenated strings

If I define a function

    inc = function(x) { return x + 1 }

and make a nested invocation of it

    inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(inc(1)))))))))))))))))))))

this will result in the value `22`. If I revise the nested expression to instead make use of `call`, passing in `null` for `this`, as

    inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, 1)))))))))))))))))))))

this will also produce the value `22`. 

But, on JavaScriptCore this second form appears to consume _O_(2^_n_) memory, where _n_ is the number of nested calls. This is not the case if I try this JavaScript in Firefox or Chrome so it seems to be isolated to JavaScriptCore.

I have very little JavaScript experience (almost none). I don&#39;t have a feel for the tradeoffs that various JavaScript implementations might make, nor whether it is reasonable for the example code to be expensive in some implementations (providing generic support for closures or some such), while efficient in others.

My question is: Is this code inherently problematic? Should it be rewritten to be structured in a different way? Or is the code fine—does JavaScriptCore simply have a bug? 

I&#39;ve done some experimentation where refactoring a few of the inner calls to temporaries will &quot;truncate&quot; the memory doubling behavior

    var temp1 = inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, 1)))))));
                                                                                                  
    var temp2 = inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, temp1)))))));
        
    inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, inc.call(null, temp2)))))));

JavaScriptCore nested &quot;call&quot; performance issue

I use Traceur Compiler to have advantage with ES6 features now. 

I want to implement this stuff from ES5:

    function Animal() {
        var self = this,
            sayHi;
        
        sayHi  = function() {
            self.hi();
        };
    
        this.hi = function() {/* ... */}
    }

Currently traceur does not support `private` and `public` keywords ([from harmony][1]). And ES6 class syntax does not allow to use simple `var` (or `let`) statements in class body. 

The only way that I am find is to simulate privates before class declaration. Something like:

    var sayHi = function() {
        // ... do stuff
    };
    
    class Animal {
    ...

It is better then nothing but as expected you can not pass correct `this` to private method without `apply`-ing or `bind`-ing it every time.

So, is there any possibility to use private data in ES6 class compatible with traceur compiler?


  [1]: http://wiki.ecmascript.org/doku.php?id=harmony:classes

How to implement private method in ES6 class with Traceur

If I type `019 &gt; 020` in the JavaScript console (tested in both Chrome and Firefox), I get the answer `true`.

This is due to `020` being interpreted as an [`OctalIntegerLiteral`][1] (equals `16`) whereas `019` is apparently being interpreted as [`DecimalLiteral`][2] (and equals `19`). As `19` is greater than `16`, `019 &gt; 020` is `true`.

What puzzles me is why `019` is interpreted as a `DecimalLiteral` in first place. Which production is it? `DecimalIntegerLiteral` does not allow `019`:

    DecimalIntegerLiteral ::
        0
        NonZeroDigit DecimalDigits_opt

`OctalIntegerLiteral` also does not allow `019` (as `9` is not an octal digit):

    OctalIntegerLiteral ::
        0 OctalDigit
        OctalIntegerLiteral OctalDigit
    
    OctalDigit :: one of
        0 1 2 3 4 5 6 7

So from what I see in the specification, `019` should actually be rejected, I don&#39;t see why it is interpreted as a decimal integer.

I guess there&#39;s some kind of compatibility rule in place here but I have failed to find a formal definition. Could please anyone help me with this?

(Why I need this: I&#39;m developing a [JavaScript/ECMAScript parser for Java with JavaCC][3] and have to pay a special attention to the specification - and deviations thereof.)


  [1]: http://www.ecma-international.org/ecma-262/5.1/#sec-B.1.1
  [2]: http://www.ecma-international.org/ecma-262/5.1/#sec-7.8.3
  [3]: https://github.com/highsource/javascript-codemodel

Why is 019 not a JavaScript syntax error? Or why is 019 &gt; 020

Why are objects not iterable by default?

**I see questions all the time related to iterating objects, the common solution being to iterate over an object&#39;s properties and accessing the values within an object that way. This seems so common that it makes me wonder why objects themselves aren&#39;t iterable.**

Statements like the ES6 [`for...of`][1] would be nice to use for objects by default. Because these features are only available for special &quot;iterable objects&quot; which don&#39;t include `{}` objects, we have to go through hoops to make this work for objects we want to use it for. 

&gt; The for...of statement creates a loop Iterating over **iterable objects**
&gt; (including Array, Map, Set, arguments object and so on)...

For example using an ES6 [generator function][2]:

    var example = {a: {e: &#39;one&#39;, f: &#39;two&#39;}, b: {g: &#39;three&#39;}, c: {h: &#39;four&#39;, i: &#39;five&#39;}};
    
    function* entries(obj) {
       for (let key of Object.keys(obj)) {
         yield [key, obj[key]];
       }
    }
    
    for (let [key, value] of entries(example)) {
      console.log(key);
      console.log(value);
      for (let [key, value] of entries(value)) {
        console.log(key);
        console.log(value);
      }
    }

The above properly logs data in the order I expect it to when I run the code in Firefox (which supports [ES6][3]):

![output of hacky for...of][4]

**By default, `{}` objects are not iterable, but why? Would the disadvantages outweigh the potential benefits of objects being iterable? What are the issues associated with this?**

In addition, because `{}` objects are different from &quot;Array-like&quot; collections and &quot;iterable objects&quot; such as [`NodeList`][7], [`HtmlCollection`][8], and [`arguments`][9], they can&#39;t be converted into Arrays.

For example:

`var argumentsArray = Array.prototype.slice.call(arguments);` 

or be used with Array methods:

`Array.prototype.forEach.call(nodeList, function (element) {})`.

**Besides the questions I have above, I would love to see a working example on how to make `{}` objects into iterables, especially from those who have mentioned the `[Symbol.iterator]`.** This should allow these new `{}` &quot;iterable objects&quot; to use statements like `for...of`. Also, I wonder if making objects iterable allow them to be converted into Arrays.

I tried the below code, but I get a `TypeError: can&#39;t convert undefined to object`.

    var example = {a: {e: &#39;one&#39;, f: &#39;two&#39;}, b: {g: &#39;three&#39;}, c: {h: &#39;four&#39;, i: &#39;five&#39;}};
    
    // I want to be able to use &quot;for...of&quot; for the &quot;example&quot; object.
    // I also want to be able to convert the &quot;example&quot; object into an Array.
    example[Symbol.iterator] = function* (obj) {
       for (let key of Object.keys(obj)) {
         yield [key, obj[key]];
       }
    };
    
    for (let [key, value] of example) { console.log(value); } // error
    console.log([...example]); // error


  [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of
  [2]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*
  [3]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/ECMAScript_6_support_in_Mozilla
  [4]: http://i.stack.imgur.com/SSJbr.png
  [5]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
  [6]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for
  [7]: https://developer.mozilla.org/en-US/docs/Web/API/NodeList
  [8]: https://developer.mozilla.org/en-US/docs/Web/API/HTMLCollection
  [9]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments
  [10]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols

Why are Objects not Iterable in JavaScript?

I am trying to run this code but it is giving me following errors:

&gt; Animal.ts(10,13): error TS1056: Accessors are only available when
&gt; targeting ECMAScript 5 and higher. Animal.ts(14,13): error TS1056:
&gt; Accessors are only available when targeting ECMAScript 5 and higher.


    interface IAnimal{
        name : string;
        sayName():string;
    }

    class AnimalImpm implements IAnimal{
        private _name : string = &#39;[Animal]&#39;;
        get name():string{
            return this._name;
        }

        set name(name:string){
            this._name = name;
        }

        constructor(name:string){
            this.name = name;
        }

        sayName():string {
            console.log(`My name is ${this.name}`);
            return &quot;Hello&quot;;
        }
    }


Accessors are only available when targeting ECMAScript 5 and higher

Say you have an array-like Javascript ES6 Iterable that you know in advance will be finite in length, what&#39;s the best way to convert that to a Javascript Array?

The reason for doing so is that many js libraries such as underscore and lodash only support Arrays, so if you wish to use any of their functions on an Iterable, it must first be converted to an Array.

In python you can just use the list() function. Is there an equivalent in ES6?

Convert ES6 Iterable to Array

That is, how do I express

    function *(next) {}

with arrow syntax? I&#39;ve tried all the combinations I could think of, and I can&#39;t find any documentation on it.

(I am currently using Node.js v0.11.14.)




Can I use ES6&#39;s arrow function syntax with generators? (arrow notation)

Using ES6 arrow functions with lexical `this` binding is great.

However, I ran into an issue a moment ago using it with a typical jQuery click binding:

    class Game {
      foo() {
        self = this;
        this._pads.on(&#39;click&#39;, function() {
          if (self.go) { $(this).addClass(&#39;active&#39;); }
        });
      }
    }

Using an arrow function instead:


    class Game {
      foo() {
        this._pads.on(&#39;click&#39;, () =&gt; {
          if (this.go) { $(this).addClass(&#39;active&#39;); }
        });
      }
    }

And then `$(this)` gets converted to ES5 (self = this) type closure.

Is a way to have Traceur ignore &quot;$(this)&quot; for lexical binding?


Using jQuery $(this) with ES6 Arrow Functions (lexical this binding)

Can someone explain to me: why are generator functions in ES6 marked by asterisk symbol? 

For example, instead of:

&lt;!-- language: lang-js --&gt;

    function *someGenerator() {
        yield 1;
        yield 2;
        yield 3;
    }

we could write:   

&lt;!-- language: lang-js --&gt;

    function someGenerator() {
        yield 1;
        yield 2;
        yield 3;
    }

or even:
&lt;!-- language: lang-js --&gt;

    var someGenerator = () =&gt; {
        yield 1;
        yield 2;
        yield 3;
    }

    var someObject = {

        someGenerator() {
            yield 1;
            yield 2;
            yield 3;
        }
    }            

The JS compiler can detect that `someGenerator` contains `yield` operator at the parse time and make a generator from this function.
 
Why is detection of `yield` existence not enough?


What&#39;s the purpose of an asterisk (*) in ES6 generator functions

I just started to use Babel to compile my ES6 javascript code into ES5. When I start to use Promises it looks like it&#39;s not working. The Babel website states support for promises via polyfills.

Without any luck, I tried to add:

    require(&quot;babel/polyfill&quot;);

or

    import * as p from &quot;babel/polyfill&quot;;

With that I&#39;ll get the following error on my app bootstrapping:

&gt; Cannot find module &#39;babel/polyfill&#39;

I searched for the module but it seems I&#39;m missing some fundamental thing here. I also tried to add the old and good bluebird NPM but it looks like it&#39;s not working.

How to use the polyfills from Babel?


How do I install the babel-polyfill library?

I have a simple code that runs perfectly on every browser except for the Internet Explorer 11. How can I make it work on all browsers?

[Codepen][1]

    &#39;use strict&#39;;
    
    let promise = new Promise((resolve, reject) =&gt; {
    
      setTimeout(() =&gt; {
        resolve(&quot;result&quot;);
      }, 1000);
    });
    
    promise
      .then(
        result =&gt; {
          alert(&quot;Fulfilled: &quot; + result);
        },
        error =&gt; {
          alert(&quot;Rejected: &quot; + error);
        }
      );


  [1]: http://codepen.io/Alexnotonfire/pen/bpBvqW?editors=0010

How to support promises in Internet Explorer 11?

I am building a Angular4 project using Angular CLI (1.1.2). It runs perfectly in Chrome (Version 59.0.3071.115) and firefox(54.0.1) but when I tried to use IE11 (Verison 11.0.9600.18738) nothings shows up and when I open the develper mode in IE, it shows me the following Error:

    SCRIPT5022: Exception thrown and not caught
    File: polyfills.bundle.js, Line: 829, Column: 34

And the detailed Error message is following:

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/O2L2B.png


Anyone knows how to solve this problem?

Thanks!

Angular4 Application running issues in IE11

I&#39;m developing a webpage in a mixed web browser environment (Chrome/IE11). 
IE11 doesn&#39;t support CSS variables, is there a polyfill or script that exists that would allow me to use CSS variables in IE11?


IE11 - does a polyfill / script exist for CSS variables?

I have an issue with IE 11 and my react app. I use Webpack, babel and polyfill.io cdn and all is nice until rendering bundeled file, then it stops doing anything.
Do you have any idea what may go wrong?

Thanks in advance.

Content Type	Original Author	Original Content on Stackoverflow
Question	garbanzio	View Question on Stackoverflow
Solution 1 - Javascript	Joachim Sauer	View Answer on Stackoverflow

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