True if maybeKeyed
is a Collection.Keyed, or any of its subclasses.
isKeyed(maybeKeyed: unknown): boolean
const { isKeyed, Map, List, Stack } = require('immutable');
isKeyed([]); // false
isKeyed({}); // false
isKeyed(Map()); // true
isKeyed(List()); // false
isKeyed(Stack()); // falserun it