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Fix usage for decorated class properties #17326

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Commits on Oct 28, 2020

  1. Fix usage for decorated class properties

    Given the following `tsconfig.json`:
    
    ```json
    {
      "compilerOptions": {
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true
      }
    }
    ```
    
    The following will currently causes an import error:
    
    ```ts
    import { IconName } from '@fortawesome/fontawesome-common-types';
    
    class MyClass {
      @MyDecorator
      icon: IconName;
    }
    ```
    
    This is because in some situations TypeScript doesn’t know that `IconName` is a
    only exists as a type. It will generate an import, which can’t be resolved.
    
    Simply adding an empty JavaScript file, will make the environment able to import
    the package, even though the import value of `IconName` will be `undefined`.
    remcohaszing committed Oct 28, 2020
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