/**
 * Case-insensitive map, keys are case-insensitive.
 *
 * @example
 * ```ts
 * import { CiMap } from "@ayonli/jsext/collections";
 *
 * const map = new CiMap<string, string>();
 *
 * map.set("foo", "hello");
 * map.set("bar", "world");
 *
 * console.log(map.get("FOO")); // hello
 * console.log(map.has("BAR")); // true
 * ```
 */
export default class CiMap<K extends string, V> extends Map<K, any> {
    get [Symbol.toStringTag](): "CiMap";
    constructor(iterable?: Iterable<readonly [K, V]> | null);
    set(key: K, value: V): this;
    get(key: K): V | undefined;
    has(key: K): boolean;
    delete(key: K): boolean;
    entries(): IterableIterator<[K, V]>;
    keys(): IterableIterator<K>;
    values(): IterableIterator<V>;
    forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void;
    [Symbol.iterator](): IterableIterator<[K, V]>;
}