@clementdreptin
I got the same error! As I understand it, the problem is that webpack settings do not know how to work with mjs files. I work with nativescript-vue. I found a solution for compiling mjs files for vue, but I don't know how to integrate it into the project:
// vue.config.js
module.exports = {
chainWebpack: config => config.resolve.extensions.prepend('.mjs').prepend('.wasm')
}