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# no-misused-promises

[Added in v0.1.4](https://github.com/web-infra-dev/rslint/releases/tag/v0.1.4)
## Configuration

| Preset                              | Configured Value |
| ----------------------------------- | ---------------- |
| ✅ ts.configs.recommendedTypeChecked | `"error"`        |
| ✅ ts.configs.strictTypeChecked      | `"error"`        |


```ts title=rslint.config.ts
import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/no-misused-promises': 'error',
    },
  },
]);
```

## Rule Details

Disallows Promises in places that are not designed to handle them. This rule catches common mistakes such as using a Promise in a conditional check (where it always evaluates to truthy), passing an async function as a callback where a void return is expected, spreading a Promise in an object, or returning a Promise-returning function where a void return is expected. The rule checks conditionals, void returns (arguments, properties, variables, inherited methods, attributes, and return statements), and object spreads.

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

```typescript
// Promise used in conditional (always truthy)
if (fetchData()) {
}

// Async function passed where void callback expected
[1, 2, 3].forEach(async n => {
  await doSomething(n);
});

// Spreading a Promise in an object
const obj = { ...fetchData() };

// Returning async function where void expected
const listeners = {
  onClick: async () => await handleClick(),
};
```

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

```typescript
if (await fetchData()) {
}

for (const n of [1, 2, 3]) {
  await doSomething(n);
}

const data = await fetchData();
const obj = { ...data };

const listeners = {
  onClick: () => {
    void handleClick();
  },
};
```

## Original Documentation

- [typescript-eslint: no-misused-promises](https://typescript-eslint.io/rules/no-misused-promises)
- [Source code](https://github.com/typescript-eslint/typescript-eslint/blob/v8.28.0/packages/eslint-plugin/src/rules/no-misused-promises.ts)