Angular-cli: The Array.includes polyfill is not added to the polyfills-es5.ts file

[destus90]

🐞 Bug report

I try to run my app in IE11. In the browser console I get this error
TypeError: Object doesn't support property or method 'includes', but with Differential Loading concept Angular should automatically add the polyfills with the used setup. My browserslist looks like

> 0.5%
last 2 versions
Firefox ESR
IE 11

A temporary workaround is to add import 'core-js/features/array/includes' in the polyfills.ts file.

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

The previous versions don't have the Differential Loading concept

Description

See above

🔬 Minimal Reproduction

1. See the repo https://github.com/destus90/cli-array-includes-issue
2. Clone it, install modules and run ng build command.
3. Run some static server (for example node-static), go to IE11 and check out the browser's console.

🔥 Exception or Error

TypeError: Object doesn't support property or method 'includes'

🌍 Your Environment

Angular CLI: 8.0.3
Node: 12.3.1
OS: win32 x64
Angular: 8.0.1
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.800.3
@angular-devkit/build-angular     0.800.3
@angular-devkit/build-optimizer   0.800.3
@angular-devkit/build-webpack     0.800.3
@angular-devkit/core              8.0.3
@angular-devkit/schematics        8.0.3
@angular/cli                      8.0.3
@ngtools/webpack                  8.0.3
@schematics/angular               8.0.3
@schematics/update                0.800.3
rxjs                              6.4.0
typescript                        3.4.5
webpack                           4.30.0

Anything else relevant?

[alan-agius4]

Hi, thanks for opening the issue. However we only include polyfills which are directly required by the Angular framework.

If you include code that requires additional polyfills to work on older browsers, you need to include these yourself in the polyfills.ts file.

[timbru31]

For future Google search visitors:

import 'core-js/modules/es.array.includes';

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