export type IColumnKeyCreator = {
    getUniqueKey(colId?: string | null, colField?: string | null): string;
};
/** @internal AG_GRID_INTERNAL - Not for public use. Can change / be removed at any time. */
export declare class ColumnKeyCreator implements IColumnKeyCreator {
    private existingKeys;
    addExistingKeys(keys: string[]): void;
    getUniqueKey(colId?: string | null, colField?: string | null): string;
}