Cannot import @cycle/time/rxjs

[kiyui]

Importing mockTimeSource from the rxjs variant of @cycle/time throws an error because it is importing an undefined path. I believe this issue is related to #672, as the cause seems to originate from the bundled rxjs.d.ts file wherein certain imports do not point to the ./lib/cjs/src/.. variant.

Code to reproduce the issue:

import { mockTimeSource } from '@cycle/time/rxjs';

Alternatively, the following branch where I am testing on:
kiyui/cycle-rxjs-playground#1

Expected behavior:
Importing mockTimeSource should not result in any errors.

Actual behavior:

  [at-loader] ./node_modules/@cycle/time/rxjs.d.ts:3:42 
      TS2307: Cannot find module './src/types'.

Versions of packages used:
@cycle/time: 0.18.0

Thanks in advance 🙇‍♂️ !