Do you need to wrap RXJS Observables in try-catch?

 No.

Internally errors are caught implicitly.

Here is a good example, give it a swing yourself! (Source)

	import { throwError, of, Observable } from 'rxjs';
	import { catchError, map } from 'rxjs/operators';
	const exampleOne$ = new Observable(subscriber => {
	throw new Error('thrown');
	});
	exampleOne$.pipe(
	catchError(val => of(`Exmaple One ${val}`))
	).subscribe(console.log); // Exmaple One Error: thrown
	const exampleTwo$ = new Observable(subscriber => {
	try {
	throw new Error('native error')
	}
	catch (e) {
	subscriber.error(e);
	}
	});
	exampleTwo$.pipe(
	catchError(val => of(`Example Two ${val}`))
	).subscribe(console.log); // Example Two Error: thrown

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