"Zone.js has detected that ZoneAwarePromise `(window|global).Promise` has been overwritten

There is error when exceljs is used in code.

Error:

Error: “Zone.js has detected that ZoneAwarePromise (window|global).Promise has been overwritten. Most likely cause is that a Promise polyfill has been loaded after Zone.js (Polyfilling Promise api is not necessary when zone.js is loaded. If you must load one, do so before loading zone.js.)” Angular 5 o exceljs.min.js:3

My service.ts file

import { Injectable } from '@angular/core'; import * as Excel from "exceljs/dist/exceljs.min.js"; import * as fs from 'file-saver'; @Injectable({ providedIn: 'root' }) export class ExcelserviceService {

constructor() { }

generatereport(dummydata):void{

let workbook = new Excel.Workbook();

let worksheet = workbook.addWorksheet('Car Data');

} }

[inyourdrimz]

fixed mine by importing it before ‘core-js’ and ‘zone.js’ in the pollyfills.ts file

pollyfills.ts file:

import 'exceljs/dist/exceljs.min.js';

/** IE9, IE10 and IE11 requires all of the following polyfills. */
import 'core-js/es6/symbol';
.
.
. 
.
.
.
import 'zone.js/dist/zone';

[bleuscyther]

I suggested a PR that should fix this issue. You can download it and build to test the excelis.min files.

It worked for me i did not need to import in the polyfill.ts anymore.

import {Row, Workbook, Worksheet} from 'exceljs';
...
    const workbook: Workbook = new Workbook();

    const sheet: Worksheet = workbook.addWorksheet( ....