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‎README.md‎

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# Binding observable data to an Angular TreeGrid
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Learn how you can bind observable data to the Syncfusion Angular TreeGrid control. This example explains how to bind observables using the async pipe to subscribe to observable objects and get the latest emitted values. It also explains how to bind observable data while expand operations are performed in the TreeGrid.
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Documentation: https://ej2.syncfusion.com/angular/documentation/treegrid/observables/?no-cache=1#observables
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## Project prerequisites
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Make sure you have the compatible versions of TypeScript and Angular on your machine before starting to work on this project:
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* Angular 4+
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* TypeScript 2.6+
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## How to run this application
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To run this application, you need to first clone the `Binding-Observable-data-to-an-Angular-Tree-Grid` repository and then navigate to the path where it has been copied to your system.
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To do this, open the Command Prompt and run the following commands, one after the other:
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```
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git clone https://github.com/SyncfusionExamples/Binding-Observable-data-to-an-Angular-Tree-Grid treegrid-example
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cd treegrid-example
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```
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## Installation
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Once done with downloading, you need to install the necessary packages required to run this application locally. To do so, run the following command:
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```
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npm install
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```
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This will install all the needed Angular packages into your current project.
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## Running on a development server
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Run the `ng serve` command for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.
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## Further help
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To get more help with the Angular CLI, use `ng help` or check out the [Angular CLI README](https://github.com/angular/angular-cli/blob/master/README.md).

‎angular.json‎

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{
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"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
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"version": 1,
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"newProjectRoot": "projects",
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"projects": {
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"editing": {
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"root": "",
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"sourceRoot": "src",
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"projectType": "application",
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"prefix": "app",
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"schematics": {},
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"architect": {
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"build": {
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"builder": "@angular-devkit/build-angular:browser",
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"options": {
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"outputPath": "dist/editing",
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"index": "src/index.html",
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"main": "src/main.ts",
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"polyfills": "src/polyfills.ts",
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"tsConfig": "src/tsconfig.app.json",
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"assets": [
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"src/favicon.ico",
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"src/assets"
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],
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"styles": [
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"src/styles.css",
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"./node_modules/@syncfusion/ej2-material-theme/styles/material.css"
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],
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"scripts": []
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},
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"configurations": {
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"production": {
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"fileReplacements": [
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{
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"replace": "src/environments/environment.ts",
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"with": "src/environments/environment.prod.ts"
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}
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],
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"optimization": true,
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"outputHashing": "all",
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"sourceMap": false,
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"extractCss": true,
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"namedChunks": false,
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"aot": true,
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"extractLicenses": true,
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"vendorChunk": false,
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"buildOptimizer": true,
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"budgets": [
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{
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"type": "initial",
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"maximumWarning": "2mb",
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"maximumError": "5mb"
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}
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]
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}
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}
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},
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"serve": {
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"builder": "@angular-devkit/build-angular:dev-server",
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"options": {
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"browserTarget": "editing:build"
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},
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"configurations": {
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"production": {
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"browserTarget": "editing:build:production"
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}
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}
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},
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"extract-i18n": {
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"builder": "@angular-devkit/build-angular:extract-i18n",
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"options": {
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"browserTarget": "editing:build"
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}
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},
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"test": {
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"builder": "@angular-devkit/build-angular:karma",
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"options": {
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"main": "src/test.ts",
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"polyfills": "src/polyfills.ts",
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"tsConfig": "src/tsconfig.spec.json",
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"karmaConfig": "src/karma.conf.js",
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"styles": [
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"src/styles.css",
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"./node_modules/@syncfusion/ej2-material-theme/styles/material.css"
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],
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"scripts": [],
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"assets": [
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"src/favicon.ico",
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"src/assets"
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]
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}
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},
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"lint": {
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"builder": "@angular-devkit/build-angular:tslint",
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"options": {
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"tsConfig": [
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"src/tsconfig.app.json",
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"src/tsconfig.spec.json"
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],
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"exclude": [
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"**/node_modules/**"
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]
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}
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}
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}
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},
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"editing-e2e": {
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"root": "e2e/",
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"projectType": "application",
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"prefix": "",
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"architect": {
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"e2e": {
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"builder": "@angular-devkit/build-angular:protractor",
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"options": {
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"protractorConfig": "e2e/protractor.conf.js",
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"devServerTarget": "editing:serve"
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},
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"configurations": {
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"production": {
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"devServerTarget": "editing:serve:production"
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}
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}
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},
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"lint": {
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"builder": "@angular-devkit/build-angular:tslint",
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"options": {
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"tsConfig": "e2e/tsconfig.e2e.json",
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"exclude": [
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"**/node_modules/**"
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]
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}
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}
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}
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}
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},
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"defaultProject": "editing"
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}

‎e2e/protractor.conf.js‎

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// Protractor configuration file, see link for more information
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// https://github.com/angular/protractor/blob/master/lib/config.ts
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const { SpecReporter } = require('jasmine-spec-reporter');
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exports.config = {
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allScriptsTimeout: 11000,
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specs: [
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'./src/**/*.e2e-spec.ts'
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],
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capabilities: {
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'browserName': 'chrome'
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},
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directConnect: true,
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baseUrl: 'http://localhost:4200/',
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framework: 'jasmine',
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jasmineNodeOpts: {
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showColors: true,
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defaultTimeoutInterval: 30000,
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print: function() {}
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},
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onPrepare() {
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require('ts-node').register({
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project: require('path').join(__dirname, './tsconfig.e2e.json')
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});
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jasmine.getEnv().addReporter(new SpecReporter({ spec: { displayStacktrace: true } }));
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}
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};

‎e2e/src/app.e2e-spec.ts‎

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import { AppPage } from './app.po';
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describe('workspace-project App', () => {
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let page: AppPage;
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beforeEach(() => {
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page = new AppPage();
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});
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it('should display welcome message', () => {
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page.navigateTo();
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expect(page.getTitleText()).toEqual('Welcome to editing!');
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});
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});

‎e2e/src/app.po.ts‎

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import { browser, by, element } from 'protractor';
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export class AppPage {
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navigateTo() {
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return browser.get('/');
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}
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getTitleText() {
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return element(by.css('app-root h1')).getText();
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}
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}

‎e2e/tsconfig.e2e.json‎

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{
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"extends": "../tsconfig.json",
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"compilerOptions": {
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"outDir": "../out-tsc/app",
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"module": "commonjs",
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"target": "es5",
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"types": [
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"jasmine",
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"jasminewd2",
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"node"
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]
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}
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}

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