Creating a Typescript HttpInterceptor and ensuring its compatibility with minification techniques

Currently, I am trying to implement an Angular HttpInterceptor based on the solution provided in this Stack Overflow response:

However, I am struggling with the factory method:

 public static Factory($q: ng.IQService) {
    return new AuthenticationInterceptor($q);
}

It seems that we are reliant on the $q service being injected, but this will create issues when the code is minified. How can I ensure that it remains minification-safe? Would using the string array syntax be a viable solution?

Answer №1

After some trial and error, I managed to figure it out.

Summary:

In order to resolve the issue, I placed this code line AFTER and outside of the class definition:

ApiCallInterceptor.Factory.$inject = ["$q"];

The nitty-gritty details

For future reference, here's the process I followed:

  • I utilized a tool called ng-annotate. If incorporated into the build process, it would have solved the problem.
  • Since we do not intend to use this tool for the build, it wasn't a viable solution for me.

So, here's what I did:

I installed ng-annotate and executed it as a one-time command to identify the necessary javascript code:

npm install -g ng-annotate
  • I temporarily appended the @ngannotate marker to my factory method
  • Ran the file through ng-annotate
  • Observed that ng-annotate generated the following line of code:

    ApiCallInterceptor.Factory.$inject = ["$q"];

Great, now I just needed to ensure typescript could generate that line of code.

After much experimentation, I discovered that the key is to add the following line of code OUTSIDE of the class definition. Attempting to include it within the class definition would result in compile-time syntax errors.

ApiCallInterceptor.Factory.$inject = ["$q"];

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