LayZeeDK

flowchart TD
    A[ContentChild] --> B;
    B{Is static?} -- No --> C;
    B -- Yes --> D;
    C[Make the query<br>type optional] --> E(Access in<br>ngAfterContentInit<br>or later);
    D(Add assertion<br>in ngOnInit or<br>ngOnChanges) --> F;
    F[Add ! to<br>the query type] --> G(Access in<br>ngOnInit<br>or later)

ThomasBurleson

/**
 *  When manually subscribing to an observable in a view component, developers are traditionally required
 *  to unsubscribe during ngOnDestroy. This utility method auto-configures and manages that relationship
 *  by watching the DOM with a MutationObserver and internally using the takeUntil RxJS operator.
 *
 *  Angular 7 has stricter enforcements and throws errors with monkey-patching of view component life-cycle methods.
 *  Here is an updated version that uses MutationObserver to accomplish the  same goal.
 *
 *  @code
 *

PCreations

Source : Learn to combine RxJs sequences with super intuitive interactive diagrams

Legend

Merge

Concat

ediblecode

$version = (Get-Content package.json) -join "`n" | ConvertFrom-Json | Select -ExpandProperty "version"
$buildCounter = "%build.counter%"
$buildNumber = "$version.$buildCounter"
Write-Host "##teamcity[buildNumber '$buildNumber']"

mhevery

Microsyntax

Microsyntax in Angular allows you to write <div *ngFor="let item of items">{{item}}</div> instead of <ng-template ngFor [ngForOf]="items"><div>{{item}}</div></ng-template.

Constraints

The microsyntax must:

• be know ahead of time so that IDEs can parse it without knowing what is the underlying semantics of the directive or what directives are present.
• must translate to key-value attributes in the DOM.

adamrecsko

import {PipeTransform, Pipe} from 'angular2/core';

@Pipe({ name: 'highlight' })
export class HighLightPipe implements PipeTransform {
  transform(text: string, [search]): string {
    return search ? text.replace(new RegExp(search, 'i'), `<span class="highlight">${search}</span>`) : text;
  }
}

/** Usage: 

carcinocron

// Run this in the F12 javascript console in chrome
// if a redirect happens, the page will pause
// this helps because chrome's network tab's
// "preserve log" seems to technically preserve the log
// but you can't actually LOOK at it...
// also the "replay xhr" feature does not work after reload
// even if you "preserve log".

window.addEventListener("beforeunload", function() { debugger; }, false)

addyosmani

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version