Rxjs error: The 'pipe' property is not found on the 'UnaryFunction<Observable<{}>, Observable<string | {}>>' type

Currently working on implementing ngbTypeAhead and encountering problems with RxJS version 5.5.5. The example I am referencing is from version 6 of rxjs.

"rxjs": "^5.5.2" and
 angular "^5.0.1",
"typescript": "~2.6.1",

While trying to apply typeahead on focus, an error occurs:

 *[ts] Property 'pipe' does not exist on type 'UnaryFunction<Observable<{}>, Observable<string | {}>>'.
any*

search2 = (text$: Observable<string>) => {
    const debouncedText$ = text$.pipe(debounceTime(200), distinctUntilChanged());
    const clicksWithClosedPopup$ = this.click$.pipe(filter(() => !this.instance.isPopupOpen()));
    const inputFocus$ = this.focus$;

    let mer = merge(debouncedText$, inputFocus$, clicksWithClosedPopup$);
    debugger;
    return mer.pipe(
      map(term => (term === '' ? this.roadList
        : this.roadList.filter(v => v.toLowerCase().indexOf(term.toString().toLowerCase()) > -1)).slice(0, 10))
    );
  }

Seeking assistance in resolving the issue with rewriting the search2 method above.

Answer №1

It seems that you may be mistakenly importing the merge as an operator rather than the "Observable creation method" which is directly from 'rxjs'.

To clarify, make sure you are using the correct import for RxJS 6:

import { merge } from 'rxjs';

Avoid importing the merge operator that you do not want with this line:

import { merge } from 'rxjs/operators'; // This only imports the operator

For RxJS 5, the appropriate import statement would be:

import { merge } from 'rxjs/observable/merge';

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