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# node/no-callback-literal
> ensure Node.js-style error-first callback pattern is followed
When invoking a callback function which uses the Node.js error-first callback pattern, all of your errors should either use the `Error` class or a subclass of it. It is also acceptable to use `undefined` or `null` if there is no error.
## 📖 Rule Details
When a function is named `cb` or `callback`, then it must be invoked with a first argument that is `undefined`, `null`, an `Error` class, or a subclass or `Error`.
Examples of :-1: **incorrect** code for this rule:
```js
/*eslint node/no-callback-literal: "error" */
cb('this is an error string');
cb({ a: 1 });
callback(0);
```
Examples of :+1: **correct** code for this rule:
```js
/*eslint node/no-callback-literal: "error" */
cb(undefined);
cb(null, 5);
callback(new Error('some error'));
callback(someVariable);
```
### Options
```json
{
"rules": {
"node/no-callback-literal": "error"
}
}
```
## 🔎 Implementation
- [Rule source](../../lib/rules/no-callback-literal.js)
- [Test source](../../tests/lib/rules/no-callback-literal.js)
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