Sometimes when I enable this plugin for one file this file is excluded from sourcemap

[galoko]

I didn't get exact details, I was just adding ES6 code to ES5 module like this:

insert.transform((magicString, code) => `${code}\nexport default Module;`, {
    include: "src/wasm/engine.js",
}),

and engine.js was not in sourcemap.

without this plugin everything works fine.

[JounQin]

Thanks for reporting first.

https://antfu.me/posts/why-reproductions-are-required

[JounQin]

And did you tried append?