In some parts it's eval-cheap-module-source-map,
https://webpack.js.org/api/cli/#shortcuts
https://webpack.js.org/guides/build-performance/#devtool

Instead in the Sourcemap documentation it's cheap-module-eval-source-map:

https://webpack.js.org/configuration/devtool/

Which one is correct? Searching for those in the webpack repo, it gives results for both of the words.