This is a simple example that demonstrates the use of the lettable operator map with pipe from the provided link:
import { map } from 'rxjs/operator/map';
let o = of(1, 2, 3, 4).pipe(
map((v) => v * 2)
);
However, when running this code, it triggers the error message
Error:(34, 5) TS2684:The 'this' context of type 'void' is not assignable to method's 'this' of type 'Observable<{}>'.It is recommended to import lettable instance operators from rxjs/operators:
import { map } from 'rxjs/operators';
Instead of importing non-lettable equivalents from rxjs/operator:
import { map } from 'rxjs/operator/map';
If you want to understand more about lettable operators, we suggest reading:
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