```ts

Observable("test")
  .map((_) => _ + _)
  .mergeMap((_) => Observable([_]))
  .tap((_) => Observable(console.log(_))) // bs obviously
  .subscribe()

Observable("test")
  .map((_) => _ + _)
  .mergeMap((_) => Observable([_]))
  .tap((_) => Observable(console.log(_))) // bs obviously
  .subscribe()

import * as tsplus_module_1 from "ts-plus-test/rxjs/bindings";
tsplus_module_1.toArray_(tsplus_module_1.tap_(tsplus_module_1.mergeMap_(tsplus_module_1.map_(tsplus_module_1.of("test"), (_) => _ + _), (_) => tsplus_module_1.of([_])), (_) => tsplus_module_1.of(console.log(_)))).subscribe();

import * as tsplus_module_1 from "ts-plus-test/rxjs/bindings";
tsplus_module_1.toArray_(tsplus_module_1.tap_(tsplus_module_1.mergeMap_(tsplus_module_1.map_(tsplus_module_1.of("test"), (_) => _ + _), (_) => tsplus_module_1.of([_])), (_) => tsplus_module_1.of(console.log(_)))).subscribe();