angular output decorator is not working giving the error

Question

demo.Parent.html

<p>demo-parent works!</p>
<app-demo-child (property)="parentFunction($event)"  ></app-demo-child>

demo.parent.component.ts

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-demo-parent',
  templateUrl: './demo-parent.component.html',
  styleUrls: ['./demo-parent.component.css']
})
export class DemoParentComponent implements OnInit {

  constructor() { }


  display : any;

  parentFuction(event: any){

    this.display=event;
    console.log(this.display);

  }
  ngOnInit() {
  }

}

demo.child.html

<p>demo-child works!</p>

demo.child.component.ts

export class DemoChildComponent implements OnInit {

@Output() property = new EventEmitter<String>();

 value : string="angualr";

  constructor() { 

  }


  senndData(){
    this.property.emit( this.value);
  }
  ngOnInit() {
  }

}

.

Expected 0 type arguments, but got 1

WARNING in ./node_modules/protractor/built/configParser.js Module not found: Error: Can't resolve 'coffee-script' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built'

WARNING in ./node_modules/protractor/built/configParser.js Module not found: Error: Can't resolve 'coffeescript' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built'

WARNING in ./node_modules/protractor/node_modules/source-map-support/source-map-support.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/node_modules/source-map-support'

WARNING in ./node_modules/protractor/node_modules/source-map-support/source-map-support.js Module not found: Error: Can't resolve 'module' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/node_modules/source-map-support'

ERROR in ./node_modules/saucelabs/index.js Module not found: Error: Can't resolve './lib-cov/SauceLabs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/saucelabs' ERROR in ./node_modules/protractor/built/runner.js Module not found: Error: Can't resolve 'child_process' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built' ERROR in ./node_modules/protractor/built/debugger.js Module not found: Error: Can't resolve 'child_process' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built' ERROR in ./node_modules/protractor/built/bpRunner.js Module not found: Error: Can't resolve 'child_process' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built' ERROR in ./node_modules/selenium-webdriver/firefox/binary.js Module not found: Error: Can't resolve 'child_process' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/firefox' ERROR in ./node_modules/selenium-webdriver/io/exec.js Module not found: Error: Can't resolve 'child_process' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/io' ERROR in ./node_modules/selenium-webdriver/net/portprober.js Module not found: Error: Can't resolve 'child_process' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/net' ERROR in ./node_modules/blocking-proxy/built/lib/webdriver_logger.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/blocking-proxy/built/lib' ERROR in ./node_modules/fs.realpath/index.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/fs.realpath' ERROR in ./node_modules/fs.realpath/old.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/fs.realpath' 1mERROR in ./node_modules/glob/glob.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/glob' ERROR in ./node_modules/glob/sync.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/glob' ERROR in ./node_modules/protractor/built/logger.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built' ERROR in ./node_modules/protractor/built/driverProviders/direct.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built/driverProviders' ERROR in ./node_modules/protractor/built/driverProviders/local.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/built/driverProviders' ERROR in ./node_modules/protractor/node_modules/webdriver-manager/built/lib/cli/logger.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/protractor/node_modules/webdriver-manager/built/lib/cli' ERROR in ./node_modules/rimraf/rimraf.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/rimraf' ERROR in ./node_modules/selenium-webdriver/chrome.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver' ERROR in ./node_modules/selenium-webdriver/edge.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver' ERROR in ./node_modules/selenium-webdriver/ie.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver' ERROR in ./node_modules/selenium-webdriver/opera.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver' ERROR in ./node_modules/selenium-webdriver/phantomjs.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver' ERROR in ./node_modules/selenium-webdriver/firefox/binary.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/firefox' ERROR in ./node_modules/selenium-webdriver/firefox/profile.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/firefox' ERROR in ./node_modules/selenium-webdriver/firefox/extension.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/firefox' ERROR in ./node_modules/selenium-webdriver/io/index.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/io' ERROR in ./node_modules/selenium-webdriver/lib/devmode.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/lib' ERROR in ./node_modules/selenium-webdriver/net/portprober.js Module not found: Error: Can't resolve 'fs' in '/home/sangamnath/Desktop/angualr/ball/node_modules/selenium-webdriver/net'

@sagar can you show how you called DemoChildComponent component in html — Akhil Aravind
– Akhil Aravind, Commented Feb 13, 2020 at 6:50

Vijay Prajapati · Accepted Answer · 2020-02-13 07:14:16Z

4

Try importing EventEmitter from Angular instead of from protractor:

import { Component, OnInit, Output, EventEmitter } from '@angular/core';

edited Feb 13, 2020 at 7:14

answered Feb 13, 2020 at 6:49

Vijay Prajapati

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2 Comments

sagar k Over a year ago

Hi Vijay Import error has been cleared but now I not able to get data from a child

Vijay Prajapati Over a year ago

must be same type parent and child both component

WorksLikeACharm · Accepted Answer · 2020-02-13 06:44:31Z

1

//value : string="sam";

-> this.value is not defined, as it´s only a comment. Is that the case in your real code too?

answered Feb 13, 2020 at 6:44

WorksLikeACharm

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