fix: issue-webpack-error should not add colors to file string

[sreucherand]

Introduced in #641, the issue location is now coloured in green in both the terminal console and in the error sent to webpack.

No problem at all in the terminal:

Having a look at the message sent through ws:

The file property contains the ANSI chalk chars corresponding to the colour applied to the issue location.

The thing is, in the webpack-dev-server overlay, the location does not come up properly:

In fact, the overlay does not seem to apply a ANSI to HTML conversion for the header of the message (file) (see. overlay.js#L247) but only for the body of the message (message) (see. overlay.js#L262).

I suggest that we just remove the coloured location in the error message sent to webpack.

Here is a minimum reproducible example:
https://github.com/sreucherand/webpack-ts-checker-minimal-reproducible-example

yarn
yarn start

[sreucherand]

Hi @piotr-oles, did you have the opportunity to look at this?

[piotr-oles]

Hi! The change looks reasonable, let's wait for the CI to pass and we can merge it

[github-actions]

🎉 This PR is included in version 9.0.2 🎉

The release is available on:

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

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