plugin-legacy injects a __vite_legacy_plugin function which is incompatible with iife formats

[lvancraen]

Question

Is there a way to remove the injected __vite_legacy_guard function without needing to write a generateBundle plugin to remove it?

Why?

I'm attempting to generate a bundle which is intended to be used within a classic <script /> tag (no type=module).

My ideal format for the bundle is iife, which aligns with what is proposed in Rollup output formats.

However, when I generate the bundle, plugin-legacy injects an exported function __vite_legacy_guard, which means I end up with a bundle which looks like:

export function __vite_legacy_guard(){import.meta.url,import("_").catch(()=>1),async function*(){}().next()}(function(){...})();

This added function causes an error to be thrown when the bundle is loaded by the <script />:

SyntaxError: Unexpected token 'export'

Fwiw, the need for a legacy guard is obsolete in my use-case. My server has logic to determine which chunks to serve (modern or legacy); and thus, I don't require checking this at runtime.