The best way with fd to match on files with
a specific extension is to use the -e flag.
Here is how you'd find all .ts files:
$ fd -e tsYou can use the flag multiple times to specify multiple file extensions. This will turn up all TypeScript and JavaScript files:
$ fd -e ts -e jsAlternatively, you can use regex in the filename pattern to match on several file extensions like so:
$ fd '.*\.(js|ts|jsx|tsx)$'