export declare class GenericCache<Key, Item> {
    private _keyLookupFunction?;
    /** @remarks Using a keyLoopupFunction makes the cache much much slower! */
    constructor(_keyLookupFunction?: ((key1: Key, key2: Key) => boolean) | undefined);
    _cache: Map<Key, Item>;
    get(key: Key, createMissing: () => Item): Item;
    delete: (key: Key) => boolean;
    clear: () => void;
    /**
     * This might seem unnecessary, but for non-primitive datatypes equality is compared on
     * reference, not value, so finding the right key is a thing that must be done.
     */
    findExistingKeyOrReturnInput(key: Key, keyLookupFunction: (key1: Key, key2: Key) => boolean): Key;
}
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