Rule proposal: `explicit-timer-delay`

[azat-io]

Description

Enforce or disallow explicit delay argument for setTimeout() and setInterval()

Allow configuring whether setTimeout() and setInterval() must have an explicit delay argument. This provides flexibility for different team preferences.

Examples

{
  "unicorn/explicit-timer-delay": ["error", "always" | "never"]
}

• "always" (default): Require explicit delay argument
• "never": Disallow explicit delay when it's 0 (prefer implicit default)

With "always":

// ❌ Fail
setTimeout(() => console.log('Hello'));
setInterval(callback);

// ✅ Pass
setTimeout(() => console.log('Hello'), 0);
setInterval(callback, 0);

With "never":

// ❌ Fail
setTimeout(() => console.log('Hello'), 0);

// ✅ Pass
setTimeout(() => console.log('Hello'));
setInterval(callback, 1000); // Non-zero is still OK

Proposed rule name

explicit-timer-delay

Additional Info

No response