Differential loading with es5 support enabled doesn't inject es5 bundles in the extra html files generated through @angular-builders/custom-webpack

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
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• doc

Description

A clear and concise description of the problem...

Recently we updated our project to Angular9.1.0 from Angularv7.3.8. We use @angular-builders/custom-webpack to generate index files for higher environments. After migration, i enabled Differential loading with es5 support enabled(With browserslist for IE11). After build, i can see that the generated htmls through custom webpack builder doesn’t have es5 builds injected in it. It has all the es2015 bundles and polyfills-es5. Since it doesn’t have other es bundles in it, it will fail in IE.

🔬 Minimal Reproduction

https://stackblitz.com/edit/angular-kzvnyl

🌍 Your Environment

Angular cli 9.1.1 Nod 10.15.3 Os: Win32

“@angular/animations”: “^9.1.0”, “@angular/common”: “^9.1.0”, “@angular/compiler”: “^9.1.0”, “@angular/core”: “^9.1.0”, “@angular/forms”: “^9.1.0”, “@angular/platform-browser”: “^9.1.0”, “@angular/platform-browser-dynamic”: “^9.1.0”, “@angular/platform-server”: “^9.1.0”, “@angular/router”: “^9.1.0”, “@angular/cli”: “^9.1.0”, “@angular/compiler-cli”: “^9.1.0”, “@angular/language-service”: “^9.1.0”, “@angular-builders/custom-webpack”: “^9.0.0”, “@angular-builders/dev-server”: “^7.3.1”, “@angular-devkit/build-angular”: “~0.901.0”,

[just-jeb]

Just to clarify - indexTransform is an option in custom-webpack builder.

[arbali12]

My bad…didn’t notice it :p