Factory function in Angular for translating using arrow syntax

When I include TranslateModule using the following code:

TranslateModule.forRoot({
    loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpClient]
    }
})

where

export function HttpLoaderFactory(http: HttpClient) {
    return new TranslateHttpLoader(http, "./assets/i18n/", ".json");
}

everything functions correctly. However, if I switch to an arrow function:

export const HttpLoaderFactory = (http: HttpClient) => new TranslateHttpLoader(http, "./assets/i18n/", ".json");

I encounter this error:

Uncaught ReferenceError: Cannot access 'HttpLoaderFactory' before initialization
    at Module.HttpLoaderFactory (app.component.ts:18:26)
    at Module.10617 (core-components.module.ts:18:29)
    at __webpack_require__ (bootstrap:19:1)
    ...

Why is this issue occurring?

Appreciate any help!

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