Angular Component "before destroy"

beforeOnDestroy.ts

import { Component, Input, OnDestroy } from '@angular/core';
import { timer } from 'rxjs';
import { timeInterval, pluck, take} from 'rxjs/operators';

interface BeforeOnDestroy {
  ngxBeforeOnDestroy();
}

type NgxInstance = BeforeOnDestroy & Object;
type Descriptor = TypedPropertyDescriptor<Function>;
type Key = string | symbol;

function BeforeOnDestroy(
  target: NgxInstance,
  key: Key,
  descriptor: Descriptor
) {
  return {
    value: async function(...args: any[]) {
      await target.ngxBeforeOnDestroy.apply(this);
      return descriptor.value.apply(target, args);
    },
  };
}

credits: angular/angular#20713 (comment)