Cannot use JSX unless the "--jsx" flag is provided

🎉🎉🎉 Hey there, techies! Are you facing the dreaded error of "Cannot use JSX unless the '--jsx' flag is provided"? 😱 Don't worry, we've got you covered! In this blog post, we'll dive into some common issues related to this problem and provide easy solutions to help you overcome it. 💪

First things first, let's take a look at the context provided by our fellow developer:

"I have looked around a bit for a solution to this problem. All of them suggest adding 'jsx': 'react' to your tsconfig.json file. Which I have done. Another one was to add 'include: []', which I have also done. However, I am still getting the error when I am trying to edit .tsx files. Below is my tsconfig file."

<pre><code>{ "compilerOptions": { "module": "commonjs", "target": "es5", "allowJs": true, "checkJs": false, "jsx": "react", "outDir": "./build", "rootDir": "./lib", "removeComments": true, "noEmit": true, "pretty": true, "skipLibCheck": true, "strict": true, "moduleResolution": "node", "esModuleInterop": true }, "include": [ "./lib/**/*" ], "exclude": [ "node_modules" ] } </code></pre>

Our friend has already tried a couple of solutions but is still facing the issue. Let's provide a step-by-step guide to make sure we cover all the bases. 📝

Solution 1: Check your TypeScript configuration

The first solution suggests adding the following line to your tsconfig.json file:

"compilerOptions": {
    "jsx": "react"
}

Our friend has already done this, so we can move on to the next solution.

Solution 2: Ensure correct file inclusion

Sometimes, the problem can arise from incorrect file inclusion. Here's what you need to do:

1. Open your tsconfig.json file. ✨

2. Look for the "include" property.

3. Check if the file or folder containing your .tsx files is correctly included.

4. Ensure that the pattern you use matches the location of your TypeScript files.

In our friend's case, they have already included the correct folder in their configuration:

"include": [
    "./lib/**/*"
]

Since they have done this correctly, let's move on to another solution.

Solution 3: Check your build pipeline

Sometimes, the issue could be related to your build process using Babel. Make sure you have the necessary plugins and presets installed.

1. Check your package.json for the required dependencies.

2. Ensure that you have installed the @babel/preset-react and @babel/preset-typescript presets.

3. Double-check your build script and make sure it includes the necessary Babel configuration.

If our fellow developer still faces the issue after going through these steps, it might be helpful for them to provide additional files for debugging purposes.

We hope this guide helps you fix the "Cannot use JSX unless the '--jsx' flag is provided" error like a pro! If you have any questions or need further assistance, feel free to drop a comment below. Let's work together to make coding a smoother journey for everyone! 😉💻

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