eslint-config-prettier runs prettier on every file being linted

[petetnt]

https://typescript-eslint.io/linting/troubleshooting/performance-troubleshooting/#eslint-plugin-prettier

This plugin surfaces Prettier formatting problems at lint time, helping to ensure your code is always formatted. However this comes at a quite a large cost - in order to figure out if there is a difference, it has to do a Prettier format on every file being linted. This means that each file will be parsed twice - once by ESLint, and once by Prettier. This can add up for large codebases.

Instead of using this plugin, we recommend using Prettier's --check flag to detect if a file has not been correctly formatted.

On larger codebases, this definitely seems noticeable.