sfcc/prefer-const

Requires const for let and var declarations that are never reassigned, except in Rhino-sensitive scopes where const would be unsafe.

What it checks

• Finds declarations whose variables are never reassigned
• Skips nested blocks, because Rhino can treat nested const bindings as conflicting function-scoped bindings
• Skips Rhino-critical scopes, such as loop headers and related declarations handled by sfcc/rhino-const-compat

Fix behavior

• Rewrites eligible let and var declarations to const
• Leaves unsafe scopes alone so --fix does not bounce between conflicting rules

Why this rule exists

The config aims to preserve the safe use of const while avoiding patterns that behave differently in Rhino. That keeps the fix flow stable and makes the Rhino-specific rules cooperate instead of fighting each other.

Default behavior

• Severity: error
• Auto-fix: yes

Example

Invalid

let value = compute() 

Valid

const value = compute()