no-useless-collection-argument

📝 Disallow useless values or fallbacks in Set, Map, WeakSet, or WeakMap.

💼 This rule is enabled in the following configs: ✅ recommended, ☑️ unopinionated.

🔧💡 This rule is automatically fixable by the --fix CLI option and manually fixable by editor suggestions.

It's unnecessary to pass an empty array or string when constructing a Set, Map, WeakSet, or WeakMap, since they accept nullish values.

It's also unnecessary to provide a fallback for possible nullish values.

Examples

// ❌
const set = new Set([]);
// ❌
const set = new Set("");

// ✅
const set = new Set();

// ❌
const set = new Set(foo ?? []);
// ❌
const set = new Set(foo ?? "");

// ✅
const set = new Set(foo);