@development-environment/linting/node_modules/rxjs/src/add/operator/mapTo.ts

Automatically catches many issues as they happen

import { Observable } from '../../Observable';
import { mapTo } from '../../operator/mapTo';

Observable.prototype.mapTo = mapTo;

declare module '../../Observable' {
  interface Observable<T> {
    mapTo: typeof mapTo;
  }
}