Property ‘catch’ does not exist on type ‘Observable’

Warning: This solution is deprecated since Angular 5.5, please refer to Trent’s answer below

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Yes, you need to import the operator:

import 'rxjs/add/operator/catch';

Or import Observable this way:

import {Observable} from 'rxjs/Rx';

But in this case, you import all operators.

See this question for more details:

• Angular HTTP GET with TypeScript error http.get(…).map is not a function in [null]