/**
 * Represents a function used to resolve an entity by key.
 */
export declare type ILookupResolver<Key, Value> = (key: Key) => Value;
/**
 * Represents an in-memory cache that allows values to be resolved on-demand.
 */
export interface ILookup<Key extends string | number, Value> {
    /**
     * Looks up the value or the specified key.
     * If the value has already been resolved, the cached value will be returned; otherwise,
     * the value will be resolved.
     * @param key The key of the value to retrieve.
     */
    find(key: Key): Value;
    /**
     * Stores the specified key/value pair and replaces the cached value.
     * @param key The key to override.
     * @param value The value to override.
     */
    inject(key: Key, value: Value): void;
    /**
     * Clears the specified key and invalidates the cache.
     * @param key The key to invalidate.
     */
    clear(key: Key): void;
    /**
     * Clears all keys and invalidates the cache.
     * @param key The key to invalidate.
     */
    clearAll(): void;
}
/**
 * Represents a simple hash (JSON object).
 */
export declare type Hash<Value> = {
    [key: string | number]: Value;
};
/**
 * Represents an in-memory cache that allows values to be resolved on-demand.
 */
export declare class Lookup<Key extends string | number, Value> implements ILookup<Key, Value> {
    private readonly resolver;
    private readonly values;
    constructor(resolver: ILookupResolver<Key, Value>);
    /**
     * Stores the specified key/value pair and replaces the cached value.
     * @param key The key to override.
     * @param value The value to override.
     */
    inject(key: Key, value: Value): void;
    /**
     * Looks up the value or the specified key.
     * If the value has already been resolved, the cached value will be returned; otherwise,
     * the value will be resolved.
     * @param key The key of the value to retrieve.
     */
    find(key: Key): Value;
    /**
     * Clears the specified key and invalidates the cache.
     * @param key The key to invalidate.
     */
    clear(key: Key): void;
    /**
     * Clears all keys and invalidates the cache.
     * @param key The key to invalidate.
     */
    clearAll(): void;
}