/**
 * A map, will throw error when try to get not exists key
 */
export declare class RequiredMap<K, V> extends Map<K, V> {
    /**
     * Get value from map, if not exists, throw an error
     */
    get(id: K): V;
    /**
     * Get value from map, if not exists, return def instead (not insert it into map)
     */
    get(id: K, def: V): V;
    /**
     * Get a value, if not exists, call init() and save to map
     */
    entry(id: K, init: (id: K) => V): V;
}
/**
 * A map that holds instances, automatically create new instance
 */
export declare abstract class InstanceMap<K, V> extends Map<K, V> {
    protected abstract instance(key: K): V;
    /**
     * Get a value, if not exists, call init() and save to map
     */
    get(id: K): V;
}
//# sourceMappingURL=required-map.d.ts.map