How to add line numbers to code blocks?

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Edit: ok I whipped together a quick theme component. I will add some settings later to control background and text colours.

The image displays a text-based interface with a code snippet for a JavaScript function, showcasing the use of a for loop and the event listener base type. (Captioned by AI)
The image displays a text-based interface with a code snippet for a JavaScript function, showcasing the use of a for loop and the event listener base type. (Captioned by AI)805×632 52 KB