type Index = number;
type Revision = number;
/**
 * This class keeps a linear array of values and a mapping between the key of the value and its index in the array.
 * It also allows to specify a `revision` for each value, so that always the most up-to-date value is kept.
 * It does not support removing values.
 */
export declare class IndexedMap<Key extends string | number, Value> {
    /** Mapping between keys and indexes */
    private index;
    /** The linear array of values */
    private array;
    /**
     * Stores a value. If a value with the same key already exists, it will keep the one with highest `revision` value.
     * @returns the index of the value in the array
     */
    set(key: Key, value: Value, revision?: Revision): Index;
    /** @returns the index of the value with the given key */
    getIndex(key: Key): Index | undefined;
    /** @returns the value with the given key */
    getByIndex(idx: Index): Value | undefined;
    /** @returns the array containing all values */
    get values(): Value[];
    /** @returns the number of values stored */
    get size(): number;
}
export {};