/**
 * Registry
 *
 * The Registry class is basically just a mapping from a string key to an object.
 * It is really not much more than an object. It is however useful for the
 * following reasons:
 *
 * 1. it let us react and execute code when someone add something to the registry
 *   (for example, the FunctionRegistry subclass this for this purpose)
 * 2. it throws an error when the get operation fails
 * 3. it provides a chained API to add items to the registry.
 */
export declare class Registry<T> {
    content: {
        [key: string]: T;
    };
    /**
     * Add an item to the registry, you can only add if there is no item
     * already present in the registery with the given key
     *
     * Note that this also returns the registry, so another add method call can
     * be chained
     */
    add(key: string, value: T): this;
    /**
     * Replace (or add) an item to the registry
     *
     * Note that this also returns the registry, so another add method call can
     * be chained
     */
    replace(key: string, value: T): this;
    /**
     * Get an item from the registry
     */
    get(key: string): T;
    /**
     * Check if the key is already in the registry
     */
    contains(key: string): boolean;
    /**
     * Get a list of all elements in the registry
     */
    getAll(): T[];
    /**
     * Get a list of all keys in the registry
     */
    getKeys(): string[];
    /**
     * Remove an item from the registry
     */
    remove(key: string): void;
}