prefer-const

Require const for bindings never reassigned after initialization

A let binding that is never reassigned permits a write the function does not perform.
Instead, you SHOULD declare the binding with const.

const freezes directly stored values while preserving the access carried by references.

- Category: style
- Level: warning
- Fix: automatic
- Scope: module

Reported

function identity(value: int32): int32 {
    let result = value;
    return result;
}
Accepted

function identity(value: int32): int32 {
    const result = value;
    return result;
}
Prior art

- ESLint · prefer-const

language/linter/src/rules/style/preferconst.rs:9