How to enable type checking option in Vite application?

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Vite is a modern and fast build tool for frontend development, particularly with Vue.js. It allows developers to quickly set up a project and start coding with minimal configuration. However, to ensure code quality and avoid type-related errors, it’s essential to integrate type checking into your development workflow. This guide will demonstrate how to enable type checking in a Vite application using the vue-tsc package.

Installation

Before you can enable type checking, you need to install the vue-tsc package. This package is specifically designed for Vue applications and works seamlessly with Vite. To install it, run the following command in your terminal:

npm install vue-tsc

Integration

After installing vue-tsc, you need to integrate it with your Vite build script. This is done by modifying the package.json file in your project. Refer to the below code example.

"scripts": {
  "dev": "vite",
  "build": "vue-tsc --noEmit && vite build",
  "preview": "vite preview"
}

The "build" script includes vue-tsc --noEmit, which runs the type checking process before the Vite build command vite build, and the --noEmit flag tells vue-tsc to perform type checking without generating any output files.

Type Checking

When you run the build script with the new changes, vue-tsc will check your application for type errors. If there are any issues, the build process will display errors, allowing you to identify and fix them before deploying your application.

Example

The below error indicates that there is a mismatch between expected and provided types in your code, which you should address to ensure type safety.

src/App.vue:3:5 - error TS2322: Type 'string' is not assignable to type 'number'.

let typeWillWarn: number = "111";

Found 1 error in src/App.vue:3

Conclusion

Integrating type checking into your Vite application with vue-tsc is a straightforward process that significantly improves the reliability of your code. By catching type errors early in the development cycle, you can maintain a high-quality codebase and reduce the likelihood of bugs in your Vue applications.

For more information on Vite and vue-tsc, you can refer to the following resources:

Remember to always consult the official documentation for the most up-to-date information and best practices.

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