Build optimization breaks my library code #13768
Description
🐞 Bug report
Command (mark with an x)
- [ ] new
- [ x ] build
- [ x ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc
Is this a regression?
Not sure.
Description
I created a workspace with two projects.
main-app is an application that is responsible for running the library.
domain is a library that has classes and utility methods.
When I build main-app in production (optimization=true), my utility function in domain library doesn't work.
Apparently, the problem only happens when you export arrow functions.
🔬 Minimal Reproduction
I created a repository in GitHub to reproduce this error.
🌍 Your Environment
Angular CLI: 7.3.2
Node: 10.15.1
OS: win32 x64
Angular: 7.2.6
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Package Version
------------------------------------------------------------
@angular-devkit/architect 0.13.2
@angular-devkit/build-angular 0.13.2
@angular-devkit/build-ng-packagr 0.13.2
@angular-devkit/build-optimizer 0.13.2
@angular-devkit/build-webpack 0.13.2
@angular-devkit/core 7.3.2
@angular-devkit/schematics 7.3.2
@angular/cli 7.3.2
@ngtools/json-schema 1.1.0
@ngtools/webpack 7.3.2
@schematics/angular 7.3.2
@schematics/update 0.13.2
ng-packagr 4.7.1
rxjs 6.3.3
typescript 3.2.4
webpack 4.29.0
Anything else relevant?