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To delete the sourcemap in ReactJS using webpack5, follow these steps:

1. Open the webpack.config.js file in your project.

2. Find the devtool property, which is responsible for generating a sourcemap.

3. Remove or comment out the devtool line to disable sourcemap generation.

4. Alternatively, you can set the devtool property to "none" to explicitly disable sourcemap generation.

5. Save the webpack.config.js file and rebuild your project using the webpack command.

Once you have removed or disabled the sourcemap generation, your ReactJS project will no longer generate sourcemaps. This can help reduce the size of your build and potentially improve performance. However, keep in mind that sourcemaps are useful for debugging, so disabling them may make debugging more difficult.