It&#39;s a class name that is used internally by the `BrowserAnimationsModule` when animating entry and leaving transitions. You can see it in the source code [here](https://github.com/angular/angular/blob/13e663c232dddc457e3f7243be404398624c9de6/packages/animations/browser/src/render/transition_animation_engine.ts#L25).

This class cause problem with the UI so need to replace with a 
`&lt;ng-container *ngIf=&quot;&quot;&gt;&lt;/ng-container&gt;`

I&#39;m just getting started with terraform and I&#39;d like to be able to use AWS S3 as my backend for storing the state of my projects. 

&lt;!-- language: lang-hcl --&gt;

    terraform {
        backend &quot;s3&quot; {
          bucket = &quot;tfstate&quot;
          key = &quot;app-state&quot;
          region = &quot;us-east-1&quot;
        }
    }

I feel like it is sensible to setup my S3 bucket, IAM groups and polices for the backend storage infrastructure with terraform as well. 

If I setup my backend state before I apply my initial terraform infrastructure, it reasonably complains that the backend bucket is not yet created. So, my question becomes, how do I setup my terraform backend with terraform, while keeping my state for the backend tracked by terraform. Seems like a nested dolls problem.

I have some thoughts about how to script around this, for example, checking to see if the bucket exists or some state has been set, then bootstrapping terraform and finally copying the terraform tfstate up to s3 from the local file system after the first run. But before going down this laborious path, I thought I&#39;d make sure I wasn&#39;t missing something obvious.

Initial setup of terraform backend using terraform

There is an old post asking for a construct for which `sizeof` would return `0`. There are some high score answers from high reputation users saying that by the standard no type or variable can have sizeof 0. And I agree 100% with that.

However there is [this new answer][1] which presents this solution:

    struct ZeroMemory {
        int *a[0];
    };

I was just about to down-vote and comment on it, but time spent here taught me to check even the things that I am 100% sure on. So... to my surprise both `gcc` and `clang` show the same results: `sizeof(ZeroMemory) == 0`. Even more, sizeof a variable is `0`:

    ZeroMemory z{};
    static_assert(sizeof(z) == 0); // Awkward...

Whaaaat...?

[Godbolt link][2]

How is this possible?

  [1]: https://stackoverflow.com/a/47352302/2805305
  [2]: https://godbolt.org/g/hyVr9u


How can this structure have sizeof == 0?

I&#39;m seeing that among the classes added to an element, sometimes there&#39;s this &#39;ng-star-inserted&#39; added as well and I&#39;d like to know more as to why is it there?

Angular 5 adds &#39;ng-star-inserted&#39; in some classes - what is that?

<p>I'm seeing that among the classes added to an element, sometimes there's this 'ng-star-inserted' added as well and I'd like to know more as to why is it there?</p>


I am doing some research on how to split a huge single-page-monolith into a micro-frontend architecture.

# The idea:

 - the page consists of several components which would be running autonomously
 - each component is managed by one dev-team
 - each team can change, update and deploy their components without breaking components of other teams
 - each team chooses its own toolstack

# The reason

To efficiently develop large applications you need to have many people working on it. However the number of developers per app/team does not scale well. Parallel development of multiple independent apps by independent teams however can be scaled arbitrarily

With this in mind it is imperative that teams can choose their own toolstack and especially perform independent version-upgrades of third party-libraries (like angular, react, jquery). If this was not the case a framework-update would need to be compatible with every single component before you could deploy it to production.

# Does this work with Angular?

While independent version-upgrades are necessary, it would be reasonable to restrict the teams to a few supported frameworks (Angular, React, Vue, Polymer...) and for now I try to build a demo purely consisting of Angular-Apps.

However even though Angular 5 is supposedly a platform-framework which supports huge multi-module apps, it seems to be almost impossible to have several independent angular-apps running in the same browser window.

I managed to bootstrap several Angular-Apps (different versions, each hosted on its own server) on a single webapp by utilizing HTML-Imports. However there are several `global` dependencies which need to be shared between apps

 - zone.js can only be started once
 - routing requires url-changes
 - Browser-stuff like cookies, sessionstorage, etc...

There are several articles in the net on how to bootstrap multiple angular-modules but they all refer to multiple modules in the same core-app, which in turn means they all are running on the same framework-version and an update means you have to rebuild and deploy the whole monolith.

**Is there any solution other than &quot;`iframes`&quot; to get multiple Angular (5) Apps running on the same Page?**

Angular and Micro-Frontends

I&#39;m new to Jest, I&#39;m trying to use it for testing if a function was called or not. I noticed the mock.calls.length is not resetting for every test but accumulating. How can I make it 0 before every test? I don&#39;t want my next tests depends on the results of the previous.

I know there is beforeEach in Jest - should I use it? What is the best way to reset mock.calls.length? Thank you. 

A code example:

Sum.js:

    import local from &#39;api/local&#39;;

    export default {
      addNumbers(a, b) {
        if (a + b &lt;= 10) {
          local.getData();
        }
        return a + b;
      },
    };

Sum.test.js

    import sum from &#39;api/sum&#39;;
    import local from &#39;api/local&#39;;
    jest.mock(&#39;api/local&#39;);
    
    // For current implementation, there is a difference 
    // if I put test 1 before test 2. I want it to be no difference

    // test 1
    test(&#39;should not to call local if sum is more than 10&#39;, () =&gt; {
      expect(sum.addNumbers(5, 10)).toBe(15);
      expect(local.getData.mock.calls.length).toBe(0);
    });
    
    // test 2
    test(&#39;should call local if sum &lt;= 10&#39;, () =&gt; {
      expect(sum.addNumbers(1, 4)).toBe(5);
      expect(local.getData.mock.calls.length).toBe(1);
    });

How to reset Jest mock functions calls count before every test

Hello guys I&#39;m trying to find all the results that have a in them. I have tried a couple of ways but the problem is nothing works. It just returns an empty array 

```js
var data = await getRepository(User)
  .createQueryBuilder(&quot;user&quot;)
  .where(&quot;user.firstName = %:name%&quot;, { name: firstName })
  .getMany();
```

and something like this 

```js
var data = await getRepository(User)
  .createQueryBuilder(&quot;user&quot;)
  .where(&quot;user.firstName like %:name%&quot;, { name: firstName })
  .getMany();
```

but nothing is working. All of these are returning me a empty array. Can somebody help me out thanks 

How to perform a like query TypeORM

I`m tryng to use Babel-loader on an old project, and i notice some issues regarding when babel loader is working on wrapped objects, is this its default behaviour ? I am not sure if this is a bug or something im doing wrong, i could not find much about it over google, so this is my last resource.


Would i need to change something to my code to make it work ?

This are my current specs:
 Webpack: 3.19.0
 babel/core: 7.0.0-beta.34
 babel-loader: 8.0.0-beta.0

Please refer to my packages.json if needed:

http://paste.ubuntu.com/26187880/

I`m tryng to load a single file wrapped in a function:

http://paste.ubuntu.com/26187814/

Resuming, something old, that is built like this:


    (  window.global = { } )();


This is my webpack config:


    const webpackConfig = {
        context: __dirname,
        entry: {
            app: &#39;../../JavaScript/Namespacing.js&#39;
        },
        module: {
            rules: [
              {
                test: /.jsx?$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                  loader: &#39;babel-loader&#39;,
                }
              }
            ]
        },
        output: {
          path: __dirname + &quot;/../../static/js&quot;,
          filename: &quot;[name].js&quot;
        },
        plugins: [
            new webpack.ProvidePlugin({
                $: &quot;jquery&quot;,
                jQuery: &quot;jquery&quot;,
                &quot;window.jQuery&quot;: &quot;jquery&quot;
            })
        ],
    }

And the error i get on my file is the following:

`Plugin/Preset files are not allowed to export objects, only functions.`

So, am i missing something ? 

Thanks for any help.






Babel Plugin/Preset files are not allowed to export objects, only functions

I got this array,

    var rockets = [
        { country:&#39;Russia&#39;, launches:32 },
        { country:&#39;US&#39;, launches:23 },
        { country:&#39;China&#39;, launches:16 },
        { country:&#39;Europe(ESA)&#39;, launches:7 },
        { country:&#39;India&#39;, launches:4 },
        { country:&#39;Japan&#39;, launches:3 }
    ];

What do I need to do to return an array mapped, that adds 10 to each 

&gt; launches

 value,  here my first approach,

    var launchOptimistic = rockets.map(function(elem){
      // return  elem.launches+10;
         return (elem.country, elem.launches+10);


    });
    console.log(launchOptimistic);

JS map return object

Given the current CSS grid example, how can I collapse the borders in order to avoid the double borders ?

This is such a simple thing to achieve using an Html table. How do I do it using `display: grid` ?

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    .wrapper {
      display: grid;
      grid-template-columns: 50px 50px 50px 50px;
    }

    .wrapper &gt; div {
      padding: 15px;
      text-align: center;
      border: 1px solid black;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;wrapper&quot;&gt;
      &lt;div&gt;1&lt;/div&gt;
      &lt;div&gt;2&lt;/div&gt;
      &lt;div&gt;3&lt;/div&gt;
      &lt;div&gt;4&lt;/div&gt;
      &lt;div&gt;5&lt;/div&gt;
      &lt;div&gt;6&lt;/div&gt;
      &lt;div&gt;7&lt;/div&gt;
      &lt;div&gt;8&lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;



Preventing double borders in CSS Grid

So, I&#39;ve read [here][1] that in Vue.js, you can use `/deep/` or `&gt;&gt;&gt;` in a selector in order to create style rules that apply to elements inside of child components. However, attempting to use this in my styles, whether in SCSS or in plain old CSS, doesn&#39;t work. Instead, they are sent to the browser verbatim, and therefore have no effect. For example:

**home.vue:**

    &lt;style lang=&quot;css&quot; scoped&gt;
    .autocomplete &gt;&gt;&gt; .autocomplete-input 
    {
    // ...
    }
    &lt;/style&gt;

**generated css:**

    &lt;style type=&quot;text/css&quot;&gt;
    .autocomplete &gt;&gt;&gt; .autocomplete-input[data-v-2bda0c9a]
    {
    //...
    }
    &lt;/style&gt;

**what I want:**

    &lt;style type=&quot;text/css&quot;&gt;
    .autocomplete[data-v-2bda0c9a] .autocomplete-input
    {
    //...
    }
    &lt;/style&gt;

My webpack configuration pertaining to `vue-loader` looks like this:

    // ...
    {
        test: /\.vue$/,
        loader: &quot;vue-loader&quot;,
        options: {
            loaders: {
                scss: &quot;vue-style-loader!css-loader!sass-loader&quot;
            }
        }
    }
    // ...

So my question is, how do I get this `&gt;&gt;&gt;` operator to work?

I&#39;ve already found [this][2] answer, but I&#39;m doing exactly that and it doesn&#39;t work...


  [1]: https://vue-loader.vuejs.org/en/features/scoped-css.html
  [2]: https://stackoverflow.com/a/46964259/3508956

How do I use /deep/ or &gt;&gt;&gt; or ::v-deep in Vue.js?

I&#39;m trying to retain the first 2 child elements on the same row while the third element is in its own below at full width, all while using flex.

I&#39;m particularly interested in using the `flex-grow` and `flex-shrink` properties on the first 2 elements (which is one of my reasons for not using percentages) however the third element really must be full width and below the first two.

The `label` element is added programmatically after the `text` element when there&#39;s an error and I can&#39;t change the code.

How do I force the label element to span a 100% width below the other two elements which are positioned using flex?

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    .parent {
      display: flex;
      align-items: center;
      width: 100%;
      background-color: #ececec;
    }

    .parent * {
      width: 100%;
    }

    .parent #text {
      min-width: 75px;
      flex-shrink: 2.25;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;parent&quot;&gt;
      &lt;input type=&quot;range&quot; id=&quot;range&quot;&gt;
      &lt;input type=&quot;text&quot; id=&quot;text&quot;&gt;
      &lt;label class=&quot;error&quot;&gt;Error message&lt;/label&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;



Force flex item to span full row width

Why do I have an overflow on the X axis in the following snippet?

The overflow is generated once I apply `grid-gap: 10px` on my `.body` grid container.

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    div:not(.header):not(.body):not(.row) {
      border: 1px solid grey;
    }

    .header {
      margin-top: 20px;
      display: grid;
      grid-gap: 10px;
      grid-template-areas: &quot;header-left header-right-up&quot; &quot;header-left header-right-down&quot;;
      grid-template-rows: 40px 40px;
      grid-template-columns: minmax(50px, 200px) auto;
    }

    .header-left {
      grid-area: header-left;
    }

    .header-right-up {
      grid-area: header-right-up;
    }

    .header-right-down {
      grid-area: header-right-down;
    }

    .body {
      margin-top: 20px;
      display: grid;
      grid-template-columns: 25% 50% 25%;
      grid-auto-rows: 80px; 
      grid-gap: 10px;
    }

    .row-left {
    }

    .row-center {
    }

    .row-right {
    }


&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;header&quot;&gt;
      &lt;div class=&quot;header-left&quot;&gt;image&lt;/div&gt;
      &lt;div class=&quot;header-right-up&quot;&gt;content&lt;/div&gt;
      &lt;div class=&quot;header-right-down&quot;&gt;long content&lt;/div&gt;
    &lt;/div&gt;

    &lt;div class=&quot;body&quot;&gt;
        &lt;div class=&quot;row-left&quot;&gt;&lt;/div&gt;
        &lt;div class=&quot;row-center&quot;&gt;&lt;/div&gt;
        &lt;div class=&quot;row-right&quot;&gt;&lt;/div&gt;

        &lt;div class=&quot;row-left&quot;&gt;&lt;/div&gt;
        &lt;div class=&quot;row-center&quot;&gt;&lt;/div&gt;
        &lt;div class=&quot;row-right&quot;&gt;&lt;/div&gt;

        &lt;div class=&quot;row-left&quot;&gt;&lt;/div&gt;
        &lt;div class=&quot;row-center&quot;&gt;&lt;/div&gt;
        &lt;div class=&quot;row-right&quot;&gt;&lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;

https://codepen.io/anon/pen/WdJExz?editors=1100

Why does grid-gap cause an overflow?

I&#39;m working on a website that uses `gulp` to compile and browser sync to keep the browser synchronised with my changes.

The gulp task compiles everything properly, but on the website, I&#39;m unable to see any style, and the console shows this error message:

&gt; Refused to apply style from
&gt; &#39;http://localhost:3000/assets/styles/custom-style.css&#39; because its
&gt; MIME type (&#39;text/html&#39;) is not a supported stylesheet MIME type, and
&gt; strict MIME checking is enabled.

Now, I don&#39;t really understand why this happens.

The HTML includes the file like this (which I am pretty sure is correct):

    &lt;link rel=&quot;stylesheet&quot; type=&quot;text/css&quot; href=&quot;assets/styles/custom-style.css&quot;/&gt;

And the stylesheet is a merge between Bootstrap &amp; font-awesome styles for now (nothing custom yet).

The path is correct as well, as this is the folder structure:

    index.html
    assets
    |-styles
      |-custom-style.css

But I keep getting the error.

What could it be? Is this something (maybe a setting?) for gulp/browsersync maybe?


Stylesheet not loaded because of MIME-type

&lt;!-- language-all: lang-js --&gt;

I&#39;m trying to test the interaction between a host component and a child component in an Angular application. I don&#39;t know how to get a reference to the child component created when the parent gets created. Here is the setup:

**child.component.spec.ts**

    @Component({template: `&lt;child [data]=&quot;model&quot;&gt;&lt;/child&gt;`})
    class HostComponent {
      public model:any;
    }
    
    describe(&#39;ChildComponent&#39;, () =&gt; {
      let hostFixture: ComponentFixture&lt;HostComponent&gt;;
      let childFixture: ComponentFixture&lt;ChildComponent&gt;;
    
      beforeEach(async(() =&gt; {
        TestBed.configureTestingModule({
          declarations: [ChildComponent, HostComponent]
        });
      }));
    
      beforeEach(() =&gt; {
        // this creates the child component as well, but how to get to it?
        hostFixture = TestBed.createComponent(HostComponent);
    
        // this creates a NEW instance of child component, not the one from the Host template
        // so it&#39;s not the instance I actually want to test
        childFixture = TestBed.createComponent(ChildComponent);
      });
    });

Changing the `model` value in `hostFixture.componentInstance` doesn&#39;t actually change the `data` input value of `childFixture.componentInstance`; that&#39;s how I realized that there are two instances of child component.

My question is simple, how can I get `childFixture` to refer to the component fixture found in the `HostComponent` template, instead of a different instance as I currently have it?

[The docs](https://angular.io/guide/testing#test-a-component-inside-a-test-host-component) haven&#39;t been helpful.

Angular 5 testing: how to get a reference to the child component

I am working on an Angular project. I&#39;m struggling with refresh action in a component. &lt;br&gt;&lt;br&gt;
I would like to refresh the router&#39;s components on button click.
I have refresh button when I click on it the component/router need to be refresh.&lt;br&gt;&lt;br&gt;
I tried `window.location.reload()` and `location.reload()` these two are not suitable for my need. Please help if anyone aware of it.
 

How to Refresh a Component in Angular

I got an error in my Angular Material:

    compiler.js:466 Uncaught Error: Template parse errors:
    &#39;mat-label&#39; is not a known element:
    1. If &#39;mat-label&#39; is an Angular component, then verify that it is part of this module.
    2. If &#39;mat-label&#39; is a Web Component then add &#39;CUSTOM_ELEMENTS_SCHEMA&#39; to the &#39;@NgModule.schemas&#39; of this component to suppress this message. (&quot;
            &lt;/mat-form-field&gt;
            &lt;mat-form-field&gt;
                [ERROR -&gt;]&lt;mat-label&gt;Both a label and a placeholder&lt;/mat-label&gt;
                &lt;input matInput placeholder=&quot;Simple&quot;): 


Question:

Material Label is under MatFormFieldModule [Here&#39;s the link][1]


  [1]: https://material.angular.io/components/form-field/api#MatLabel

Now, what is the possible cause of the issue why Mat-Label is unknown to Angular Material.

Here is the HTML

&gt;     &lt;mat-form-field&gt;
&gt;               &lt;mat-label&gt;Both a label and a placeholder&lt;/mat-label&gt;
&gt;               &lt;input matInput placeholder=&quot;Simple placeholder&quot;&gt;
&gt;     &lt;/mat-form-field&gt;



&#39;mat-label&#39; is not a known element Error in latest Angular Material

Is there any npm module/ other way like [React-Helmet][1] that allows us to change page title as we route through our Angular application?
 
PS: I am using Angular 5.


  [1]: https://github.com/nfl/react-helmet

How to change page title with routing in Angular application?

I am trying to build this template:

&lt;!-- language: lang-html --&gt;

    &lt;ul&gt;
        &lt;li *ngFor=&#39;let link of links&#39;&gt;
            &lt;ng-container *ngIf=&quot;link.type == &#39;complex&#39;; then complexLink else simpleLink&quot;&gt;&lt;/ng-container&gt;
        &lt;/li&gt;
    &lt;/ul&gt;
    
    &lt;ng-template #simpleLink&gt;
        ...
        {{ link.some_property }}
    &lt;/ng-template&gt;
    
    &lt;ng-template #complexLink&gt;
        ...
        {{ link.some_property }}
    &lt;/ng-template&gt;

The problem is that the link variable is undefined inside the ng-template so I get an error of accessing &#39;some_property&#39; of undefined.

I am struggeling to understand how I pass the link variable from the ngFor to the ng-template

It would be great to know if there are multiple solutions for this problem.

Content Type	Original Author	Original Content on Stackoverflow
Question	vzR	View Question on Stackoverflow
Solution 1 - Javascript	Ben Elliott	View Answer on Stackoverflow
Solution 2 - Javascript	eliprodigy	View Answer on Stackoverflow

Angular 5 adds 'ng-star-inserted' in some classes - what is that?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

How can this structure have sizeof == 0?

Initial setup of terraform backend using terraform

Attributions