Every Discord bot eventually gets the same feature request:

"Can I customize the welcome message?"

Seems simple enough. An admin wants to write something like:

Welcome {user} to {server}! You're member #{count}.

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and your bot fills in the blanks.

The first version I built looked exactly like you'd expect:

const msg = template . replaceAll ( " {user} " , `<@ ${ member . id } >` ) . replaceAll ( " {server} " , guild . name ) . replaceAll ( " {count} " , String ( guild . memberCount ));

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Honestly, it felt done.

Then reality showed up.

A server owner wanted premium members to get a different welcome message. Another wanted to display the user's roles. Someone else wanted conditional content.…