Скачать или смотреть How to Export Angular 10 Guard Using DOCUMENT for Your Public API

Learn how to resolve build errors when exporting Angular 10 guards by adjusting the DOCUMENT injection to ensure compatibility.
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Exporting Angular 10 Guard Using DOCUMENT: A Step-by-Step Guide

If you're developing an Angular 10 library and need to export a guard to your consuming applications, you might run into a frustrating build error related to the DOCUMENT type. This guide will help you understand the issue and provide a straightforward solution to successfully export your guard.

The Problem: Build Errors with DOCUMENT

When exporting your guard, you may encounter an error message similar to this:

[[See Video to Reveal this Text or Code Snippet]]

This error occurs because the Angular compiler cannot resolve the Document type during the build process. This situation usually arises when you have injected DOCUMENT into your guard, leading to complications in your library's public API.

Understanding the Guard Code

Your guard code should look something like this:

[[See Video to Reveal this Text or Code Snippet]]

In the code, DOCUMENT is injected into the constructor of the guard class, which is standard practice to access the global document object.

The Solution: Changing the Injection Type

Step 1: Modify the DOCUMENT Injection

To resolve the build error, the quickest solution is to alter the DOCUMENT injection type in your guard as follows:

[[See Video to Reveal this Text or Code Snippet]]

This change officially tells the Angular compiler to treat document as an any type, which bypasses the type-checking issue that arises from using the Document type.

Step 2: Update Your Guard Class

Here is how your modified guard class should look like after adjustment:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Rebuild Your Library

After making this change, rebuild your Angular library. The build process should complete without the previous errors, enabling you to successfully export your guard and use it in consuming applications.

Conclusion

Exporting guards in Angular libraries can sometimes lead to unexpected build errors, particularly when dealing with the DOCUMENT type. By changing the injection to any, you can overcome the resolution issue and proceed with your development work. This small yet effective tweak ensures that your guard is exportable without complications.

Now, you can confidently share your guard across applications while focusing on creating powerful features in your Angular library!