> For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt.

# logHeapUsage

- **Type:** `boolean`
- **Default:** `false`
- **CLI:** `--logHeapUsage`

Log heap usage for each test, it can help to find memory leaks in tests.


**CLI**

```bash
npx rstest --logHeapUsage
```


**rstest.config.ts**

```ts
import { defineConfig } from '@rstest/core';

export default defineConfig({
  logHeapUsage: true,
});
```


## Example

After setting `logHeapUsage` to `true`, Rstest will log heap usage for each test.

```bash
 ✓ test/index.test.ts (2) 11 MB heap used
 ✓ test/index1.test.ts (2) 11 MB heap used

 Test Files 2 passed
      Tests 2 passed | 2 skipped (4)
   Duration 233ms (build 175ms, tests 58ms)
```