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@pmun/utils / isSet
function isSet<T>(val): val is Set<T>;
检查值是否为 Set
T = any
T
any
unknown
要检查的值
val is Set<T>
如果是 Set 则返回 true,否则返回 false
isSet(new Set()) // true isSet(new WeakSet()) // false isSet([]) // false