Identifies variable definitions that aren't used.

## Examples

The following examples contain code snippets that either fail or pass this check.

### ✗ Fail


```liquid
{% assign this_variable_is_not_used = 1 %}
```


### ✓ Pass


```liquid
{% assign this_variable_is_used = 1 %}
{% if this_variable_is_used == 1 %}
  <span>Hello!</span>
{% endif %}
{% assign _prefixed_ok = 1}
```


## Options

```yaml
UnusedAssign:
  enabled: true
  severity: warning
```

| Parameter | Description |
| --- | --- |
| `enabled` | Whether this check is enabled. |
| `severity` | The [severity](https://shopify.dev/themes/tools/theme-check/configuration#check-severity) of the check. |

## Disabling this check

Variables that are known to be unused can be prefixed by a `_` to disable the check. Example:



```liquid
{% capture _ %}
  {% form "cart", cart %}
    {% assign posted_successfully = cart.posted_successfully? %}
  {% endform %}
{% endcapture %}

{% assign _unused = 'some value' %}
```



This check is safe to [disable](/docs/storefronts/themes/tools/theme-check/configuration).