The docs mention importing like so

import Vue from 'vue'
import VueRx from 'vue-rx'

Vue.use(VueRx)

However this yields a TypeScript error: TS1192: Module '...node_modules/vue-rx/types/index' has no default export

I was able to work around this via

import Vue from 'vue'
import * as VueRx from 'vue-rx'

const vueRx: any = VueRx
Vue.use(vueRx.default)

And things seem to be working normally now.

Here's the relevant package versions I'm using:

  "rxjs": "^6.2.1",
  "vue": "^2.5.2",
  "vue-router": "^3.0.1",
  "vue-rx": "^6.0.0"