Production build fails with AngularFire 7 & Firebase 9 (ES5 bundle problem)

[petrot]

Version info

Angular: 12.2.13

Firebase: 9.1.3

AngularFire: 7.2.0

Other (e.g. Ionic/Cordova, Node, browser, operating system): Ionic 5.8.5, Cordova 9, BraveBrowser, MacOS

How to reproduce these conditions

Steps to set up and reproduce

The problem occured when I ran ionic build --prod

Important! The problem appears only with Firebase 9 and AngularFire 7! With Firebase 8 and AngularFire 6 the production build works without any problem.

Sample data and security rules

Debug output

› ionic build --prod
> ng run app:build:production
✔ Browser application bundle generation complete.
⠙ Generating ES5 bundles for differential loading...An unhandled exception occurred: {project-path}/main-es2015.059a60e139f9c6cfd626.js: Unexpected token (2461:8)

  2459 |        * limitations under the License.
  2460 |        */
> 2461 | function(de){return Promise.all(de.map(function(){var P=(0,f.Z)(function*(W){try{return{fulfilled:!0,value:yield W}}catch(Ie){return{fulfilled:!1,reason:Ie}}});return function(W){return P.apply(this,arguments)}}()))}(Io);dt.ports[0].postMessage({status:"done",eventId:Lt,eventType:Un,response:Yo})})()}_subscribe(W,Ie){0===Object.keys(this.handlersMap).length&&this.eventTarget.addEventListener("message",this.boundEventHandler),this.handlersMap[W]||(this.handlersMap[W]=new Set),this.handlersMap[W].add(Ie)}_unsubscribe(W,Ie){this.handlersMap[W]&&Ie&&this.handlersMap[W].delete(Ie),(!Ie||0===this.handlersMap[W].size)&&delete this.handlersMap[W],0===Object.keys(this.handlersMap).length&&this.eventTarget.removeEventListener("message",this.boundEventHandler)}}
       |         ^
  2462 | /**
  2463 |          * @license
  2464 |          * Copyright 2020 Google LLC
See "/private/var/folders/hx/vt3ky4d13xvb7856_4mwlj300000gn/T/ng-FP9bZ2/angular-errors.log" for further details.
[ERROR] An error occurred while running subprocess ng.
        
        ng run app:build:production exited with exit code 127.
        
        Re-running this command with the --verbose flag may provide more information.

The exact problem is the function(de). It should be function de(), I think..

Expected behavior

Successful build.

Actual behavior

Build failure