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Showing content from https://reactivex.io/documentation/operators/empty-never-throw.html below:

Empty, Never, and Throw operators

RxJS implements these operators as empty, never, and throw.

var source = Rx.Observable.empty();

var subscription = source.subscribe(
    function (x) { console.log('Next: ' + x); },
    function (err) { console.log('Error: ' + err); },
    function () { console.log('Completed'); });

// This will never produce a value, hence never calling any of the callbacks
var source = Rx.Observable.never();

var subscription = source.subscribe(
    function (x) { console.log('Next: ' + x); },
    function (err) { console.log('Error: ' + err); },
    function () { console.log('Completed'); });

var source = Rx.Observable.return(42)
    .selectMany(Rx.Observable.throw(new Error('error!')));

var subscription = source.subscribe(
    function (x) { console.log('Next: ' + x); },
    function (err) { console.log('Error: ' + err); },
    function () { console.log('Completed'); });

empty is found in the following distributions:

• rx.js
• rx.all.js
• rx.all.compat.js
• rx.compat.js
• rx.lite.js
• rx.lite.compat.js

never is found in the following distributions:

• rx.js
• rx.compat.js
• rx.lite.js
• rx.lite.compat.js

throw is found in the following distributions:

• rx.js
• rx.all.js
• rx.compat.js
• rx.lite.js
• rx.lite.compat.js

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