prefer-observer.md

Avoid separate handlers (prefer-observer)

This rule effects failures if subscribe - or tap - is called with separate handlers instead of an observer.

Rule details

Examples of incorrect code for this rule:

import { of } from "rxjs";
of(42, 54).subscribe((value) => console.log(value));

Examples of correct code for this rule:

import { of } from "rxjs";
of(42, 54).subscribe({
  next: (value) => console.log(value)
});

Options

This rule accepts a single option which is an object with an allowNext property that determines whether a single next callback is allowed. By default, allowNext is true.

{
  "rxjs/prefer-observer": [
    "error",
    { "allowNext": false }
  ]
}