/**
 * @public
 * Gets the value from a `Map` for a given key, where the value is `undefined` or hasn't been set, the callback's return will be inserted into the `Map` and returned.
 * @param map - The `Map` to search and modify.
 * @param key - The key to search for / set in `map`.
 * @param getValue - The function to call if a value is not found.
 * @returns The value in `map`, otherwise the result of the `getValue`.
 *
 * @remarks
 * See {@link (mapInitializeGet:1)}.
 */
export declare function mapInitializeGet<TMapKey, TKey extends TMapKey, TMapValue, TValue extends TMapValue>(map: Map<TMapKey, TMapValue>, key: TKey, getValue: (key: TKey) => TValue): TMapValue;
/**
 * @public
 * {@inheritDoc (mapInitializeGet: 1)}
 */
export declare function mapInitializeGet<TMapKey extends object, TKey extends TMapKey, TMapValue, TValue extends TMapValue>(map: WeakMap<TMapKey, TMapValue>, key: TKey, getValue: (key: TKey) => TValue): TMapValue;
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