eslint-plugin-rxjs/docs/rules/no-unsafe-subject-next.md

ESLint rules for RxJS

# Avoid passing `undefined` to `next` (`no-unsafe-subject-next`)

This rule effects failures if `next` is called without an argument and the subject's value type is not `void`.

In RxJS version 6, the `next` method's `value` parameter is optional, but a value should always be specified for subjects with non-`void` element types.

## Rule details

Examples of **incorrect** code for this rule:

```ts
const subject = new Subject<number>();
subject.next();
```

Examples of **correct** code for this rule:

```ts
const subject = new Subject<void>();
subject.next();
```

```ts
const subject = new Subject<number>();
subject.next(0);
```

## Options

This rule has no options.