Cannot export "non-angular" classes with non-initialized static attributes

Type of Issue

[x] Bug Report
[ ] Feature Request

Description

When trying to export (amongs other things) a “non-angular” class with an uninitiailized static attribute, the packaging of the library fails with the error:

 Error: C:/dev/ng-packagr-not-ng/src/app/core/my-class.ts:1:1: Error encountered in metadata generated for exported symbol 'MyClass':
 C:/dev/ng-packagr-not-ng/src/app/core/my-class.ts:2:18: Metadata collected contains an error that will be reported at runtime: Only initialized variables and constants can be referenced because the value of this variable is needed by the template compiler.

Maybe we could add something to the config to prevent metadata generation for specified files ?

How To Reproduce

Clone this repository, do yarn install (npm install should do the trick too), then run npm run build:lib. The problematic file is src/app/core/my-class.ts

Expected Behaviour

The library is build without error

Version Information

ng-packagr: 2.4.1
@angular/compiler: 5.2.9
@angular/compiler-cli: 5.2.9
rollup: 0.55.5
tsickle: 0.27.2
typescript: 2.5.3
node: 8.9.0
yarn: 1.2.1

Kind regards,

[huang12zheng]

if you use static in your class , you need // @dynamic.

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