Скачать или смотреть Resolving the module loading error in TypeScript with Create-React-App

Encountering a module loading error while using TypeScript and Create-React-App? Learn how to fix it by organizing your scripts effectively and understanding TypeScript configurations.
---
This video is based on the question https://stackoverflow.com/q/64530884/ asked by the user 'MattoMK' ( https://stackoverflow.com/u/4876257/ ) and on the answer https://stackoverflow.com/a/64619476/ provided by the user 'MattoMK' ( https://stackoverflow.com/u/4876257/ ) 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: Create-React-App while attempting to run a Typescript mock api server (module loading error)

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 module loading error in TypeScript with Create-React-App: A Comprehensive Guide

When working with TypeScript in a Create-React-App (CRA) environment, developers may encounter frustrating module loading errors—especially when incorporating a mock API server. This issue typically arises when the TypeScript configuration differs between the client application and the server files, leading to errors like "import xxxx is not a module." In this guide, we will explore the core problem and how to effectively resolve it.

Understanding the Problem

You might have set up a CRA application in TypeScript with a mock API server, utilizing tools like json-server. However, you might face challenges such as:

Module Compatibility: Your server’s tsconfig.json may require the module setting to be CommonJS, while CRA typically uses ESNext modules.

Script Execution: Running the server script with the wrong TypeScript configuration can lead to errors, making it impossible to start both your client and API concurrently.

Example Directory Structure

To clarify, here's an example of how your project structure may look:

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

Breaking Down the Solution

Fortunately, resolving this issue is straightforward once you understand the correct configuration and execution order. Below are the steps to follow.

Step 1: Update the Package Scripts

You need to modify the scripts section in your main package.json file located in the MyApp directory to ensure the API starts with the appropriate configuration. Replace the current start:api script with the following:

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

Here’s the breakdown of the new script:

cd mockApi && npm run start: Changes the directory to the mockApi folder and runs the start command defined in that directory’s package.json.

Step 2: Ensure Your Mock API has its Own Scripts

In the MockApi/package.json, you need to ensure you have a start script that refers to your server.ts. It should look like this:

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

Step 3: Running Your Application

Now, the final step is to simply start your application. While in your main directory (MyApp), run:

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

What to Expect

Following the above steps should effectively kick off both your Create-React-App and the mock API simultaneously without any module loading errors. The essence is in correctly directing the npm script to the right TypeScript configuration, allowing for seamless integration between both components.

Conclusion

In conclusion, while integrating TypeScript with Create-React-App and developing a mock API, ensuring the correct module settings in your tsconfig.json and managing your npm scripts efficiently are key to avoiding common errors. By following the outlined approach, you can set up your development environment effectively and focus on building your application without getting bogged down by configuration issues.

If you have any further questions or face different challenges while working with CRA and TypeScript, feel free to leave a comment below! Happy coding!