/**
 * @public
 * Used with maps that store arrays. Where an array exists for a given key the value will be appended to that array, otherwise a new array will be created containing the value.
 * @param map - The `Map` to check. May be modified.
 * @param key - The key to lookup in `map`.
 * @param value - The value to push.
 *
 * @remarks
 * See {@link (mapPush: 1)}.
 */
export declare function mapPush<TKey, TValue>(map: Map<TKey, TValue[]>, key: TKey, value: TValue): void;
/**
 * @public
 * {@inheritDoc (mapPush: 1)}
 */
export declare function mapPush<TKey extends object, TValue>(map: WeakMap<TKey, TValue[]>, key: TKey, value: TValue): void;
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