message: feat(global): export lettables as Rx.operators
  fixes
diff: @@ -176,6 +176,10 @@ import { rxSubscriber } from './symbol/rxSubscriber';
  import { iterator } from './symbol/iterator';
  import { observable } from './symbol/observable';
  +import * as _operators from './operators';
  +
  +export const operators = _operators;
  +
  /* tslint:enable:no-unused-variable */
  /**
  