CODE EXAMPLE FOR JAVASCRIPT

call method from parent

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

@Component({
  selector: 'app-parent',
  styleUrls: ['./parent.component.css'],
  template: `
  <app-child [parentApi]="getParentApi()"></app-child>
`,
})
export class ParentComponent implements OnInit {

  getParentApi(): ParentComponentApi {
    return {
      callParentMethod: (name) => {
        this.parentMethod(name)
      }
    }
  }

  constructor() { }

  ngOnInit() {
  }

  parentMethod(name: string) {
    console.log(`Hello ${name} from parent`)
  }
  
}

export interface ParentComponentApi {
  callParentMethod: (string) => void
}