What does `~{}` mean in `(js* "(~{} * ~{})" 1 2)`?

Questions & Help General Questions
1

I trying a macro from https://clojuredocs.org/clojure.core/macroexpand

(macroexpand '(-> c (+ 3) (* 2)))

but got this in ClojureScript:

(js* "(~{} * ~{})" (+ c 3) 2)

What does ~{} mean here?

2

js* is a special form that’s internal to the ClojureScript compiler, it directly outputs raw JavaScript. The ~{} is a placeholder, you can give js* extra arguments, and they will be filled in in the string

(js* "alert(~{})" "ok la")
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3

Is that documented somewhere?

4

Not really, it’s an internal thing, but something you should use directly.

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