Скачать или смотреть How to Use jQuery in an Angular 15 npm Package

Discover how to successfully integrate `jQuery` into your `Angular 15` npm package and avoid common errors.
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How to Use jQuery in an Angular 15 npm Package

When working with Angular projects, you may find yourself in a situation where you need to use jQuery alongside your Angular code within a private npm package. If you've encountered an issue where jQuery functions aren’t working correctly after publishing your package, you’re not alone. In this guide, we'll walk through a real-world example of integrating jQuery in an Angular 15 package, addressing the common pitfalls, and providing solutions.

The Problem

You started developing your own npm package based on Angular with TypeScript. While testing, jQuery functions worked perfectly, but after building and publishing the package, you faced a disturbing error message:

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

This can be frustrating, especially when everything appears to work correctly in a local context. The underlying issue can often be traced back to how the TypeScript definitions are generated or how dependencies are included.

Understanding the Issue

Upon building and publishing your package, you noticed the generated PDFViewer.service.d.ts file didn't include the jQuery import. This omission leads to the error, as Angular cannot recognize jQuery when it is used in your service.

Key Points to Note

The TypeScript definition file (.d.ts) acts as a contract that tells Angular (and other developers) what types and classes are available.

Missing imports in the definition file prevent proper recognition of the jQuery functions in your service code.

The Solution

After some research and experimentation, here’s how to resolve the problem and successfully integrate jQuery into your Angular package:

Step 1: Modify angular.json Configuration

You need to include jQuery in your main project's build options. This ensures that jQuery is available globally. Open your angular.json file and add the following configuration under the appropriate build options section:

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

This modification includes the jQuery script in your Angular project during the build process.

Step 2: Update the Service Code

To ensure that TypeScript understands that you are making use of jQuery, you need to modify your pdf-viewer.service.ts file. Here's how to adjust it:

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

Explanation of Adjustments

Adding /// <reference types="jquery" /> at the top of your service file tells TypeScript to include the types for jQuery.

The declare var $: any; statement declares jQuery as a variable that can be used globally, allowing you to call jQuery functions without TypeScript throwing errors.

Conclusion

Integrating jQuery in an Angular 15 npm package can lead to issues if dependencies are not correctly referenced. By following the steps outlined above, you should be able to resolve any jQuery integration problems smoothly.

Remember, when you're publishing packages or dealing with external libraries, it’s essential to ensure all dependencies are correctly defined and imported. Happy coding!