Webpack / Mix - how to change a script directory?

I get the error "Can't resolve '../api" running "npm run dev"

I wrote a script to retrieve some data via an api call.

This script works well when I put it in the vendor directory (vendor/badaso/core/src/js/api/modules) It is called by a store in resources/js/badaso/stores with

import api from "../../../../vendor/badaso/core/src/resources/js/api";

When I move this script to resources/js/badaso/api/modules and call it by

import "../api"

Running "npm run dev", I get the error

Can't resolve '../api

My webpack.mix.js is

const mix = require('laravel-mix');

//mix.js('resources/js/app.js', 'public/js')                              // original
mix.js('resources/js/*.js', 'public/js')                                    // try -> same error
    .postCss('resources/css/app.css', 'public/css', [
        //
    ]);
// Can't resolve '../api'

// Badaso
mix.js("vendor/badaso/core/src/resources/js/app.js", "public/js/badaso.js")
    .sass("vendor/badaso/core/src/resources/js/assets/scss/style.scss", "public/css/badaso.css")
    .vue()

Thanks in advance for any help