Скачать или смотреть How to Fix the No suitable injection token for parameter 'functions' Error in Angular with Firebase

Learn how to resolve the `No suitable injection token for parameter 'functions'` error in your Angular app when using Firebase. Solutions provided step-by-step to ensure your code runs seamlessly.
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This video is based on the question https://stackoverflow.com/q/71556671/ asked by the user 'Forever Lost Account' ( https://stackoverflow.com/u/15967718/ ) and on the answer https://stackoverflow.com/a/71556789/ provided by the user 'rohithpoya' ( https://stackoverflow.com/u/18436980/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the No suitable injection token for parameter 'functions' Error in Angular with Firebase

As a developer using Angular and Firebase together, you may encounter issues that can disrupt your workflow. One such frustrating error states: No suitable injection token for parameter 'functions' of class 'TodosComponent'. This issue often arises when integrating Firebase Cloud Functions directly into your Angular components. In this guide, we will break down this problem and walk you through the solution step by step.

Understanding the Error

The error occurs in scenarios where Angular expects a certain type of dependency to be injected through the constructor, but the way you've structured your imports and injections does not align with those expectations. In the snippet below, we can see the relevant part of a component that may trigger this error:

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

Problematic Code Part

The compiler raises an error regarding private functions: functions.Functions in the constructor, indicating it does not recognize it as an injectable dependency. This typically happens because of how Firebase functions are imported and used.

Solution: Adjusting Firebase Imports

Fortunately, solving this problem is quite straightforward! Here’s how you can fix it:

Step 1: Remove Constructor Injection

Since you are importing directly from firebase/functions, you don't need to provide the functions variable in the component constructor. Instead, you can access the functions directly as a static import. Here’s what you need to do:

Remove the line from your constructor:

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

Access Firebase functions directly throughout your component without this:
Change your usage from:

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

To simply:

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

Step 2: Update Your Code

After making the required edits, your updated TodosComponent might look like this:

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

In the updated code, we efficiently use Firebase Functions without relying on Angular dependency injection, resolving the error effectively.

Conclusion

Encountering errors like No suitable injection token for parameter 'functions' of class 'TodosComponent' can be frustrating, but understanding how to manipulate imports and dependencies in Angular applications will save you time and headaches in the future. By simply adjusting how Firebase Functions are imported and utilized, you can get your application up and running smoothly.

If you continue to work with Angular and Firebase, keep this guide handy for quick reference. Happy coding!