Severity: warning
Category: lint
Stage: Stage 3

Description

A non-exported top-level binding (const, let, var, function, or class) is never referenced elsewhere in the module. Dead code should be removed or exported if it is part of the public API.

Exported declarations are never flagged — they may be consumed by other modules.

Example

// ✗ lint warning
function helper(): void {}   // SJS-L012 — never called

export function run(): void {
  console.log("ok")
}

Fix

Remove the unused declaration, call it, or export it:

// ✓ correct
export function helper(): void {}

export function run(): void {
  helper()
}

Configuration

{
  "lint": {
    "L012": "error" | "warn" | "off"
  }
}

Default: "warn" in standard mode, "error" in --strict mode.

Related codes

• SJS-L009 — unused import
• SJS-L001 — prefer const