Cannot make a prod build using @​ionic/app-scripts 2.1.3

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~~[ ] feature request~~ [new feature requests are not considered at this time]
[ ] support request/question

Current behavior

After building an Ionic 2 app (ionic-angular 3.6.0) using @​ionic/app-scripts 2.1.3, the vendor.js file throws an exception on app load:

Uncaught TypeError: Cannot read property 'a' of undefined
    at Object.<anonymous> (vendor.js:1)
    at e (vendor.js:1)
    at Object.<anonymous> (vendor.js:1)
    at e (vendor.js:1)
    at Object.415 (main.js:1)
    at e (vendor.js:1)
    at window.webpackJsonp (vendor.js:1)
    at main.js:1

The actual error is from the reference to v.a at the end of the line below:

p=a([Object(r.Component)({selector:"tag-input-dropdown",templateUrl:"./tag-input-dropdown.template.html"}),c(0,Object(r.Inject)(Object(r.forwardRef)(function(){return v.a}))),u("design:paramtypes",[v.a])],p);

Expected behavior

After a prod build, the Ionic 2 app loads without throwing an exception.

Minimal reproduction of the problem with instructions (if applicable)

1. Create an Ionic 2 app using ionic-angular 3.6.0 and @​ionic/app-scripts 2.1.3.
2. Include ngx-chips 1.5.0 with the necessary imports in the app’s @​NgModule.
3. Build the app using ionic-app-scripts build --prod.
4. Attempt to navigate to the app in a browser. Note the exception in vendor.js.

What is the motivation / use case for changing the behavior? (if applicable)

What do you use to build your app?. Please specify the version

@​ionic/app-scripts 2.1.3 ionic-app-scripts build --prod

Angular version:

4.2.0

ngx-chips version:

1.5.0

Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

all

[Gbuomprisco]

I’ll have a deeper look on Sunday

[jknisley]

The “fix” in the commit of my previous message seemed to work in practice, but unit tests sure didn’t like it. I tried using Injector instead (see https://github.com/jknisley/ngx-chips/commit/3f98d4db3159fbfefd2bd0d79d399d6aca8b7459) and looks like that works just as well and doesn’t break any tests.