Typeahead: Wikipedia example is not working at http://plnkr.co

1 possible answer(s) on “Typeahead: Wikipedia example is not working at http://plnkr.co”

1. I’ve faced with similar error (ERROR TypeError: Cannot read property ‘lift’ of undefined).

   For me it was because the search function has not returned anything however it should. There are no curly brackets ({}) in the example in the arrow function so it returns the value of the only expression. However, I’ve surrounded the function body with {} but not prefixed with return.

   So here is my answer in ‘code language’:

   Before: (mine, wrong)

   search = (text$: Observable<string>) => {
       text$
         .debounceTime(300)
         ...
         .merge(this.hideSearchingWhenUnsubscribed);
   }

   After: (corrected; instead you can also use it without curly brackets and then you can skip the return keyword)

   search = (text$: Observable<string>) => {
       return text$
         .debounceTime(300)
         ...
         .merge(this.hideSearchingWhenUnsubscribed);
   };