973 lines
32 KiB
HTML

<html lang="en"><head></head><body>
<form id="mainForm" method="post" action="https://run.stackblitz.com/api/angular/v1?file=src/app/app.component.html" target="_self"><input type="hidden" name="files[src/app/app.component.ts]" value="import { Component } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html'
})
export class AppComponent { }
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/app.module.ts]" value="import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { AstronautComponent } from './astronaut.component';
import { CountdownLocalVarParentComponent, CountdownViewChildParentComponent } from './countdown-parent.component';
import { CountdownTimerComponent } from './countdown-timer.component';
import { HeroChildComponent } from './hero-child.component';
import { HeroParentComponent } from './hero-parent.component';
import { MissionControlComponent } from './missioncontrol.component';
import { NameChildComponent } from './name-child.component';
import { NameParentComponent } from './name-parent.component';
import { VersionChildComponent } from './version-child.component';
import { VersionParentComponent } from './version-parent.component';
import { VoterComponent } from './voter.component';
import { VoteTakerComponent } from './votetaker.component';
@NgModule({
imports: [
BrowserModule,
],
declarations: [
AppComponent,
AstronautComponent,
CountdownLocalVarParentComponent,
CountdownTimerComponent,
CountdownViewChildParentComponent,
HeroChildComponent,
HeroParentComponent,
MissionControlComponent,
NameChildComponent,
NameParentComponent,
VersionChildComponent,
VersionParentComponent,
VoterComponent,
VoteTakerComponent,
],
bootstrap: [ AppComponent ],
})
export class AppModule { }
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/astronaut.component.ts]" value="import { Component, Input, OnDestroy } from '@angular/core';
import { MissionService } from './mission.service';
import { Subscription } from 'rxjs';
@Component({
selector: 'app-astronaut',
template: `
<p>
{{astronaut}}: <strong>{{mission}}</strong>
<button
(click)=&quot;confirm()&quot;
[disabled]=&quot;!announced || confirmed&quot;>
Confirm
</button>
</p>
`
})
export class AstronautComponent implements OnDestroy {
@Input() astronaut: string;
mission = '<no mission announced>';
confirmed = false;
announced = false;
subscription: Subscription;
constructor(private missionService: MissionService) {
this.subscription = missionService.missionAnnounced$.subscribe(
mission => {
this.mission = mission;
this.announced = true;
this.confirmed = false;
});
}
confirm() {
this.confirmed = true;
this.missionService.confirmMission(this.astronaut);
}
ngOnDestroy() {
// prevent memory leak when component destroyed
this.subscription.unsubscribe();
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/countdown-parent.component.ts]" value="import { AfterViewInit, ViewChild } from '@angular/core';
import { Component } from '@angular/core';
import { CountdownTimerComponent } from './countdown-timer.component';
//// Local variable, #timer, version
@Component({
selector: 'app-countdown-parent-lv',
template: `
<h3>Countdown to Liftoff (via local variable)</h3>
<button (click)=&quot;timer.start()&quot;>Start</button>
<button (click)=&quot;timer.stop()&quot;>Stop</button>
<div class=&quot;seconds&quot;>{{timer.seconds}}</div>
<app-countdown-timer #timer></app-countdown-timer>
`,
styleUrls: ['../assets/demo.css']
})
export class CountdownLocalVarParentComponent { }
//// View Child version
@Component({
selector: 'app-countdown-parent-vc',
template: `
<h3>Countdown to Liftoff (via ViewChild)</h3>
<button (click)=&quot;start()&quot;>Start</button>
<button (click)=&quot;stop()&quot;>Stop</button>
<div class=&quot;seconds&quot;>{{ seconds() }}</div>
<app-countdown-timer></app-countdown-timer>
`,
styleUrls: ['../assets/demo.css']
})
export class CountdownViewChildParentComponent implements AfterViewInit {
@ViewChild(CountdownTimerComponent)
private timerComponent: CountdownTimerComponent;
seconds() { return 0; }
ngAfterViewInit() {
// Redefine `seconds()` to get from the `CountdownTimerComponent.seconds` ...
// but wait a tick first to avoid one-time devMode
// unidirectional-data-flow-violation error
setTimeout(() => this.seconds = () => this.timerComponent.seconds, 0);
}
start() { this.timerComponent.start(); }
stop() { this.timerComponent.stop(); }
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/countdown-timer.component.ts]" value="import { Component, OnDestroy } from '@angular/core';
@Component({
selector: 'app-countdown-timer',
template: '<p>{{message}}</p>'
})
export class CountdownTimerComponent implements OnDestroy {
intervalId = 0;
message = '';
seconds = 11;
ngOnDestroy() { this.clearTimer(); }
start() { this.countDown(); }
stop() {
this.clearTimer();
this.message = `Holding at T-${this.seconds} seconds`;
}
private clearTimer() { clearInterval(this.intervalId); }
private countDown() {
this.clearTimer();
this.intervalId = window.setInterval(() => {
this.seconds -= 1;
if (this.seconds === 0) {
this.message = 'Blast off!';
} else {
if (this.seconds < 0) { this.seconds = 10; } // reset
this.message = `T-${this.seconds} seconds and counting`;
}
}, 1000);
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/hero-child.component.ts]" value="import { Component, Input } from '@angular/core';
import { Hero } from './hero';
@Component({
selector: 'app-hero-child',
template: `
<h3>{{hero.name}} says:</h3>
<p>I, {{hero.name}}, am at your service, {{masterName}}.</p>
`
})
export class HeroChildComponent {
@Input() hero: Hero;
@Input('master') masterName: string; // tslint:disable-line: no-input-rename
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/hero-parent.component.ts]" value="import { Component } from '@angular/core';
import { HEROES } from './hero';
@Component({
selector: 'app-hero-parent',
template: `
<h2>{{master}} controls {{heroes.length}} heroes</h2>
<app-hero-child *ngFor=&quot;let hero of heroes&quot;
[hero]=&quot;hero&quot;
[master]=&quot;master&quot;>
</app-hero-child>
`
})
export class HeroParentComponent {
heroes = HEROES;
master = 'Master';
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/hero.ts]" value="export interface Hero {
name: string;
}
export const HEROES = [
{name: 'Dr IQ'},
{name: 'Magneta'},
{name: 'Bombasto'}
];
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/mission.service.ts]" value="import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';
@Injectable()
export class MissionService {
// Observable string sources
private missionAnnouncedSource = new Subject<string>();
private missionConfirmedSource = new Subject<string>();
// Observable string streams
missionAnnounced$ = this.missionAnnouncedSource.asObservable();
missionConfirmed$ = this.missionConfirmedSource.asObservable();
// Service message commands
announceMission(mission: string) {
this.missionAnnouncedSource.next(mission);
}
confirmMission(astronaut: string) {
this.missionConfirmedSource.next(astronaut);
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/missioncontrol.component.ts]" value="import { Component } from '@angular/core';
import { MissionService } from './mission.service';
@Component({
selector: 'app-mission-control',
template: `
<h2>Mission Control</h2>
<button (click)=&quot;announce()&quot;>Announce mission</button>
<app-astronaut *ngFor=&quot;let astronaut of astronauts&quot;
[astronaut]=&quot;astronaut&quot;>
</app-astronaut>
<h3>History</h3>
<ul>
<li *ngFor=&quot;let event of history&quot;>{{event}}</li>
</ul>
`,
providers: [MissionService]
})
export class MissionControlComponent {
astronauts = ['Lovell', 'Swigert', 'Haise'];
history: string[] = [];
missions = ['Fly to the moon!',
'Fly to mars!',
'Fly to Vegas!'];
nextMission = 0;
constructor(private missionService: MissionService) {
missionService.missionConfirmed$.subscribe(
astronaut => {
this.history.push(`${astronaut} confirmed the mission`);
});
}
announce() {
const mission = this.missions[this.nextMission++];
this.missionService.announceMission(mission);
this.history.push(`Mission &quot;${mission}&quot; announced`);
if (this.nextMission >= this.missions.length) { this.nextMission = 0; }
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/name-child.component.ts]" value="// tslint:disable: variable-name
import { Component, Input } from '@angular/core';
@Component({
selector: 'app-name-child',
template: '<h3>&quot;{{name}}&quot;</h3>'
})
export class NameChildComponent {
@Input()
get name(): string { return this._name; }
set name(name: string) {
this._name = (name &amp;&amp; name.trim()) || '<no name set>';
}
private _name = '';
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/name-parent.component.ts]" value="import { Component } from '@angular/core';
@Component({
selector: 'app-name-parent',
template: `
<h2>Master controls {{names.length}} names</h2>
<app-name-child *ngFor=&quot;let name of names&quot; [name]=&quot;name&quot;></app-name-child>
`
})
export class NameParentComponent {
// Displays 'Dr IQ', '<no name set>', 'Bombasto'
names = ['Dr IQ', ' ', ' Bombasto '];
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/version-child.component.ts]" value="/* tslint:disable:forin */
import { Component, Input, OnChanges, SimpleChanges } from '@angular/core';
@Component({
selector: 'app-version-child',
template: `
<h3>Version {{major}}.{{minor}}</h3>
<h4>Change log:</h4>
<ul>
<li *ngFor=&quot;let change of changeLog&quot;>{{change}}</li>
</ul>
`
})
export class VersionChildComponent implements OnChanges {
@Input() major: number;
@Input() minor: number;
changeLog: string[] = [];
ngOnChanges(changes: SimpleChanges) {
const log: string[] = [];
for (const propName in changes) {
const changedProp = changes[propName];
const to = JSON.stringify(changedProp.currentValue);
if (changedProp.isFirstChange()) {
log.push(`Initial value of ${propName} set to ${to}`);
} else {
const from = JSON.stringify(changedProp.previousValue);
log.push(`${propName} changed from ${from} to ${to}`);
}
}
this.changeLog.push(log.join(', '));
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/version-parent.component.ts]" value="import { Component } from '@angular/core';
@Component({
selector: 'app-version-parent',
template: `
<h2>Source code version</h2>
<button (click)=&quot;newMinor()&quot;>New minor version</button>
<button (click)=&quot;newMajor()&quot;>New major version</button>
<app-version-child [major]=&quot;major&quot; [minor]=&quot;minor&quot;></app-version-child>
`
})
export class VersionParentComponent {
major = 1;
minor = 23;
newMinor() {
this.minor++;
}
newMajor() {
this.major++;
this.minor = 0;
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/voter.component.ts]" value="import { Component, EventEmitter, Input, Output } from '@angular/core';
@Component({
selector: 'app-voter',
template: `
<h4>{{name}}</h4>
<button (click)=&quot;vote(true)&quot; [disabled]=&quot;didVote&quot;>Agree</button>
<button (click)=&quot;vote(false)&quot; [disabled]=&quot;didVote&quot;>Disagree</button>
`
})
export class VoterComponent {
@Input() name: string;
@Output() voted = new EventEmitter<boolean>();
didVote = false;
vote(agreed: boolean) {
this.voted.emit(agreed);
this.didVote = true;
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/votetaker.component.ts]" value="import { Component } from '@angular/core';
@Component({
selector: 'app-vote-taker',
template: `
<h2>Should mankind colonize the Universe?</h2>
<h3>Agree: {{agreed}}, Disagree: {{disagreed}}</h3>
<app-voter *ngFor=&quot;let voter of voters&quot;
[name]=&quot;voter&quot;
(voted)=&quot;onVoted($event)&quot;>
</app-voter>
`
})
export class VoteTakerComponent {
agreed = 0;
disagreed = 0;
voters = ['Narco', 'Celeritas', 'Bombasto'];
onVoted(agreed: boolean) {
agreed ? this.agreed++ : this.disagreed++;
}
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/environments/environment.prod.ts]" value="export const environment = {
production: true
};
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/environments/environment.ts]" value="// This file can be replaced during build by using the `fileReplacements` array.
// `ng build --prod` replaces `environment.ts` with `environment.prod.ts`.
// The list of file replacements can be found in `angular.json`.
export const environment = {
production: false
};
/*
* For easier debugging in development mode, you can import the following file
* to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
*
* This import should be commented out in production mode because it will have a negative impact
* on performance if an error is thrown.
*/
// import 'zone.js/plugins/zone-error'; // Included with Angular CLI.
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/main.ts]" value="import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
if (environment.production) {
enableProdMode();
}
platformBrowserDynamic().bootstrapModule(AppModule);
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/polyfills.ts]" value="/**
* This file includes polyfills needed by Angular and is loaded before the app.
* You can add your own extra polyfills to this file.
*
* This file is divided into 2 sections:
* 1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
* 2. Application imports. Files imported after ZoneJS that should be loaded before your main
* file.
*
* The current setup is for so-called &quot;evergreen&quot; browsers; the last versions of browsers that
* automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
* Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
*
* Learn more in https://angular.io/guide/browser-support
*/
/***************************************************************************************************
* BROWSER POLYFILLS
*/
/** IE11 requires the following for NgClass support on SVG elements */
// import 'classlist.js'; // Run `npm install --save classlist.js`.
/**
* Web Animations `@angular/platform-browser/animations`
* Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
* Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
*/
// import 'web-animations-js'; // Run `npm install --save web-animations-js`.
/**
* By default, zone.js will patch all possible macroTask and DomEvents
* user can disable parts of macroTask/DomEvents patch by setting following flags
* because those flags need to be set before `zone.js` being loaded, and webpack
* will put import in the top of bundle, so user need to create a separate file
* in this directory (for example: zone-flags.ts), and put the following flags
* into that file, and then add the following code before importing zone.js.
* import './zone-flags';
*
* The flags allowed in zone-flags.ts are listed here.
*
* The following flags will work for all browsers.
*
* (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch
* requestAnimationFrame
* (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
* (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch
* specified eventNames
*
* in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
* with the following flag, it will bypass `zone.js` patch for IE/Edge
*
* (window as any).__Zone_enable_cross_context_check = true;
*
*/
/***************************************************************************************************
* Zone JS is required by default for Angular itself.
*/
import 'zone.js'; // Included with Angular CLI.
/***************************************************************************************************
* APPLICATION IMPORTS
*/
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/assets/demo.css]" value="/* Component Communication cookbook specific styles */
.seconds {
background-color: black;
color: red;
font-size: 3em;
margin: 0.3em 0;
text-align: center;
width: 1.5em;
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/styles.css]" value="/* Global Styles */
* {
font-family: Arial, Helvetica, sans-serif;
}
h1 {
color: #264D73;
font-size: 2.5rem;
}
h2, h3 {
color: #444;
font-weight: lighter;
}
h3 {
font-size: 1.3rem;
}
body {
padding: .5rem;
max-width: 1000px;
margin: auto;
}
@media (min-width: 600px) {
body {
padding: 2rem;
}
}
body, input[text] {
color: #333;
font-family: Cambria, Georgia, serif;
}
a {
cursor: pointer;
}
button {
background-color: #eee;
border: none;
border-radius: 4px;
cursor: pointer;
color: black;
font-size: 1.2rem;
padding: 1rem;
margin-right: 1rem;
margin-bottom: 1rem;
}
button:hover {
background-color: black;
color: white;
}
button:disabled {
background-color: #eee;
color: #aaa;
cursor: auto;
}
/* Navigation link styles */
nav a {
padding: 5px 10px;
text-decoration: none;
margin-right: 10px;
margin-top: 10px;
display: inline-block;
background-color: #e8e8e8;
color: #3d3d3d;
border-radius: 4px;
}
nav a:hover {
color: white;
background-color: #42545C;
}
nav a.active {
background-color: black;
color: white;
}
hr {
margin: 1.5rem 0;
}
input[type=&quot;text&quot;] {
box-sizing: border-box;
width: 100%;
padding: .5rem;
}
/*
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
*/"><input type="hidden" name="files[src/app/app.component.html]" value="<h1 id=&quot;top&quot;>Component Communication Cookbook</h1>
<a href=&quot;#parent-to-child&quot;>Pass data from parent to child with input binding (&quot;Heroes&quot;)</a><br/>
<a href=&quot;#parent-to-child-setter&quot;>Intercept input property changes with a setter (&quot;Master&quot;)</a><br/>
<a href=&quot;#parent-to-child-on-changes&quot;>Intercept input property changes with <i>ngOnChanges</i> (&quot;Source code version&quot;)</a><br/>
<a href=&quot;#child-to-parent&quot;>Parent listens for child event (&quot;Colonize Universe&quot;)</a><br/>
<a href=&quot;#parent-to-child-local-var&quot;>Parent to child via <i>local variable</i>(&quot;Countdown to Liftoff&quot;)</a><br/>
<a href=&quot;#parent-to-view-child&quot;>Parent calls <i>ViewChild</i>(&quot;Countdown to Liftoff&quot;)</a><br/>
<a href=&quot;#bidirectional-service&quot;>Parent and children communicate via a service (&quot;Mission Control&quot;)</a><br/>
<div id=&quot;parent-to-child&quot;>
<app-hero-parent></app-hero-parent>
</div>
<a href=&quot;#top&quot; class=&quot;to-top&quot;>Back to Top</a>
<hr>
<div id=&quot;parent-to-child-setter&quot;>
<app-name-parent></app-name-parent>
</div>
<a href=&quot;#top&quot; class=&quot;to-top&quot;>Back to Top</a>
<hr>
<div id=&quot;parent-to-child-on-changes&quot;>
<app-version-parent></app-version-parent>
</div>
<a href=&quot;#top&quot; class=&quot;to-top&quot;>Back to Top</a>
<hr>
<div id=&quot;child-to-parent&quot;>
<app-vote-taker></app-vote-taker>
</div>
<a href=&quot;#top&quot; class=&quot;to-top&quot;>Back to Top</a>
<hr>
<div id=&quot;parent-to-child-local-var&quot;>
<app-countdown-parent-lv></app-countdown-parent-lv>
</div>
<a href=&quot;#top&quot; class=&quot;to-top&quot;>Back to Top</a>
<hr>
<div id=&quot;parent-to-view-child&quot;>
<app-countdown-parent-vc></app-countdown-parent-vc>
</div>
<a href=&quot;#top&quot; class=&quot;to-top&quot;>Back to Top</a>
<hr>
<div id=&quot;bidirectional-service&quot;>
<app-mission-control></app-mission-control>
</div>
<a href=&quot;#top&quot; class=&quot;to-top&quot;>Back to Top</a>
<!--
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
-->"><input type="hidden" name="files[src/index.html]" value="<!DOCTYPE html>
<html lang=&quot;en&quot;>
<head>
<meta charset=&quot;UTF-8&quot;>
<title>Passing information from parent to child</title>
<base href=&quot;/&quot;>
<style>
.to-top {margin-top: 8px; display: block;}
</style>
</head>
<body>
<app-root></app-root>
</body>
</html>
<!--
Copyright Google LLC. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at https://angular.io/license
-->"><input type="hidden" name="files[angular.json]" value="{
&quot;$schema&quot;: &quot;./node_modules/@angular/cli/lib/config/schema.json&quot;,
&quot;version&quot;: 1,
&quot;newProjectRoot&quot;: &quot;projects&quot;,
&quot;projects&quot;: {
&quot;angular.io-example&quot;: {
&quot;projectType&quot;: &quot;application&quot;,
&quot;schematics&quot;: {
&quot;@schematics/angular:application&quot;: {
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