---
url: /commerce-klaus/packages/eslint-config-sfcc/rules/sfcc/rhino-const-compat.md
---
# sfcc/rhino-const-compat

Enforces `let` instead of `const` in Rhino-unsafe loop-related scopes.

## What it checks

* Flags `const` declarations in Rhino-critical scopes
* Targets loop headers and declarations inside loop bodies where Rhino compatibility is a concern

## Fix behavior

* Automatically rewrites the keyword from `const` to `let`

## Why this rule exists

Rhino does not handle `const` reliably in some loop-related contexts. This rule keeps the code valid in those places and prevents the fixers from producing code that works in modern JavaScript but not on SFCC sandboxes.

## Default behavior

* Severity: `error`
* Auto-fix: yes

## Example

```js [Invalid]
// [!code error:1]
for (const item of items) {
  process(item)
}
```

```js{1} [Valid]
for (let item of items) {
  process(item)
}
```