Sourcemap issues when used with Vite

[baffalop]

I tried to use this plugin with Vite to transform Vue files prior to passing to @vitejs/plugin-vue, but it appears to interfere with the production of sourcemaps. In the terminal running vite (ie. dev mode) it shows warnings:

Sourcemap for "/var/www/tpf/node_modules/vite/dist/client/client.mjs" points to missing source files
Sourcemap for "/var/www/tpf/node_modules/vite/dist/client/env.mjs" points to missing source files

And in the browser console, any warnings or errors show stack traces where most stack frames have a null filename reference, ie. null:138. When there is a reference to a Vue file, this will point to the compiled output file (with inaccurate line numbers) rather than the mapped Vue single-file component as expected.

I'm unsure if this is an interaction between this plugin and the Vue plugin, or with Vite in general.