webpack sourceMap error in 5.4.0

[obartra]

Hi there, thanks for your work on cypress-webpack-preprocessor. It's been working great for us. I was just trying to update to the latest version and ran into some issues. Let me know if I can provide any additional info.

• Operating System: MacOS 10.15.3
• Cypress Version: 4.5.0
• Browser Version: Google Chrome 81.0.4044.138 (Official Build) (64-bit)

Is this a Feature or Bug?

I'm guessing a breaking config change between 5.3.0 and 5.4.0 but I couldn't figure out how to make it work.

Current behavior:

@cypress/webpack-preprocessor@5.4.0 throws an error when trying to generate source maps

Desired behavior:

Tests run

How to reproduce:

This is my webpack config:

const webpack = require('@cypress/webpack-preprocessor');

const extensions = ['.ts', '.tsx', '.js'];
const webpackOptions = {
  resolve: {
    extensions,
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        loader: 'ts-loader',
        options: { transpileOnly: true, sourceMaps: false },
      },
    ],
  },
};

module.exports = (on) => {
  on('file:preprocessor', (file) =>
    webpack({
      webpackOptions,
    })(file)
  );
};

Just trying to load any test fails with the webpack error below

Additional Info (images, stack traces, etc)

[brian-mann]

Fixing this now

[brian-mann]

This is because you're passing transpileOnly option. If you drop that for now it will work... I'll get out a patch for this.

[josephzidell]

👍 for fixing this as I'm facing this issue as well

[chrisbreiding]

🎉 This issue has been resolved in version 5.4.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[brian-mann]

@josephzidell and @obartra can you try this out and let us know if this fixes it?

[obartra]

It's working well for me, thanks for the fast turnaround! 🎉

[josephzidell]

works well. Thanks for the quick fix 🥇