• https://cdn.bootcdn.net/ajax/libs/rxjs/6.6.0/rxjs.umd.js
• https://cdn.bootcdn.net/ajax/libs/rxjs/6.6.0/rxjs.umd.js.map
• https://cdn.bootcdn.net/ajax/libs/rxjs/6.6.0/rxjs.umd.min.js
• https://cdn.bootcdn.net/ajax/libs/rxjs/6.6.0/rxjs.umd.min.js.map