br

(module
  ;; Import the browser console object, which you'll need to pass in from JavaScript
  (import "console" "log" (func $log (param i32)))
  (func
    (block $my_block
      ;; Break out of the block
      ;; If this is removed, the code will throw an error when it reaches `unreachable`
      br $my_block
      ;; The code will never reach this point since we broke out of the block
      unreachable
    )
  )
  (start 1) ;; run the first function automatically
)

const url = "{%wasm-url%}";
await WebAssembly.instantiateStreaming(fetch(url), { console });

;; label the loop so that it can be branched to
(loop $my_loop
  ;; branch to the loop.
  ;; most of the time you'll want to put this in an if statement and only branch on condition,
  ;; otherwise you have an infinite loop.
  br $my_loop
)