In general, to fix an "expression has no effect" warning for an IIFE-like function expression, you should either remove the unused expression or, if the intention was to execute it, add the invocation () so that the function body runs. For async IIFEs used in Node scripts, the usual pattern is (async () => { ... })().catch(...);.

Here, the best fix with minimal behavior change is to turn the top-level async arrow expression into an actually invoked async IIFE. We keep the inner logic unchanged (the dynamic imports and the BedrockCli.run(...).then(...).catch(...) chain) and simply append () after the closing }); of the arrow body, then await its result if desired or just let it run. Since the body already contains its own .catch handler for errors from BedrockCli.run, we only need to ensure the outer async function itself is invoked; we don't need extra error handling around the IIFE.

Concretely in modules/server/bin/bedrock.cjs, adjust the last line from }); to })();. This calls the async arrow immediately, preserving existing functionality, but actually making it execute when the script runs. No new imports or helper methods are needed.