---
url: /docs/guide/usage/linter/rules/unicorn/no-thenable.md
---

### What it does

Disallow defining a `then` property.

### Why is this bad?

If an object is defined as "thenable", once it's accidentally
used in an `await` expression, it may cause problems.

### Examples

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

```javascript
async function example() {
  const foo = {
    unicorn: 1,
    then() {},
  };

  const { unicorn } = await foo;

  console.log("after"); // <- This will never execute
}
```

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

```javascript
async function example() {
  const foo = {
    unicorn: 1,
    bar() {},
  };

  const { unicorn } = await foo;

  console.log("after");
}
```

## How to use

## Version

This rule was added in v0.0.13.

## References