Скачать или смотреть Resolving the TS2339 Error: Using JSON Files in Angular with TypeScript `

Learn how to effectively import JSON data in Angular when using TypeScript, and how to avoid the common `TS2339` error. `
---
This video is based on the question https://stackoverflow.com/q/65682177/ asked by the user 'Weronika' ( https://stackoverflow.com/u/12933680/ ) and on the answer https://stackoverflow.com/a/65682280/ provided by the user 'Shashank Vivek' ( https://stackoverflow.com/u/3092377/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Error TS2339: Property 'default' does not exist on type 'Special[]'

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving the TS2339 Error: Using JSON Files in Angular with TypeScript

If you're developing an Angular application and working with JSON files to manage data, you might encounter a common error when trying to specify types in TypeScript. One such error is TS2339: Property 'default' does not exist on type 'Special[]'. In this post, we'll dive into the cause of this error and provide a straightforward solution to help you seamlessly integrate JSON data into your Angular components.

Understanding the Problem

While working with JSON data, you might have come across the need to define a specific type for the data you're importing. Consider the example below where we initially import JSON data without specifying its type:

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

The Error Explained

This code works, but it bypasses TypeScript's strict typing. Once you attempt to define a proper type like this:

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

You receive the error: TS2339: Property 'default' does not exist on type 'Special[]'.

This happens because TypeScript is unable to find a default property on the type you defined (Special[]). Instead, the default import behavior must be correctly set up in your tsconfig.json.

Solution: Configuring TypeScript for JSON Modules

The good news is that fixing this issue is straightforward! You need to enable two TypeScript compiler options in your tsconfig.json:

Step 1: Update tsconfig.json

Open your tsconfig.json file and add the following compiler options:

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

These options do the following:

resolveJsonModule: This allows you to import JSON files as modules.

esModuleInterop: This enables a compatibility layer for importing CommonJS modules, making it easier to work with packages that were designed for a different module system.

Step 2: Adjust the Import Statement

Now that your TypeScript configuration is updated, modify your import statement to correctly reflect the type:

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

By doing this, you can now access the data correctly typed as an array of Special without facing any TS2339 errors.

Summary

In summary, encountering the TS2339 error while importing JSON data into your Angular application can be resolved by properly configuring your TypeScript environment. By enabling resolveJsonModule and esModuleInterop in your tsconfig.json, and adjusting your import statements accordingly, you can effectively utilize JSON data while maintaining the benefits of strong typing in TypeScript.

By following these steps, you'll ensure a smoother development experience and better integration of JSON data in your Angular projects!