How to solve vue-rx incompatiblity with Vue3

[kormosp]

Hi!

No matter how I try, I cannot import vue-rx into my spring boot admin (vue3) application that was just migrated from vue2.
"vue": "^3.4.19",
"rxjs": "^6.6.7",
"vue-rx": "^6.2.0",
"vuex": "^4.1.0"

"devDependencies": {
"@vitejs/plugin-vue": "^5.0.4",
"@vue-macros/reactivity-transform": "^0.4.3",
"@vue/compiler-sfc": "^3.4.19",
"vite": "5.1.1",
"vite-plugin-static-copy": "^1.0.1"
},

import { createApp } from 'vue';
import Vue from 'vue';
import custom from "./custom.vue";
import VueRx from 'vue-rx';

const app = createApp(custom);
app.use(VueRx);
app.mount('#app')

It always throws the error of:

vue-rx.esm.js:310 Uncaught TypeError: Vue.use is not a function
    at vue-rx.esm.js:310:7
    at custom-ui.js:2:241
    at custom-ui.js:3:3

Can you please help me out?