/**
 * Expands "type" property of the meta object to single values. For example `type: 'numeric'` sets
 * "renderer", "editor", "validator" properties to specific functions designed for numeric values.
 * If "type" is passed as an object that object will be returned, excluding properties that
 * already exist in the "metaObject".
 *
 * The function utilizes `_automaticallyAssignedMetaProps` meta property that allows tracking what
 * properties are changed by the "type" expanding feature. That properties can be always overwritten by
 * the user.
 *
 * @param {object} metaObject The meta object.
 * @param {object} settings The settings object with the "type" setting.
 * @param {object} settingsToCompareWith The object to compare which properties need to be updated.
 */
export declare function extendByMetaType(metaObject: Record<string, unknown>, settings: Record<string, unknown>, settingsToCompareWith?: Record<string, unknown>): void;
/**
 * Creates new class which extends properties from TableMeta layer class.
 *
 * @param {TableMeta} TableMeta The TableMeta which the new ColumnMeta is created from.
 * @param {string[]} [conflictList] List of the properties which are conflicted with the column meta layer.
 *                                  Conflicted properties are overwritten by `undefined` value, to separate them
 *                                  from the TableMeta layer.
 * @returns {ColumnMeta} Returns constructor ready to initialize with `new` operator.
 */
export declare function columnFactory(TableMeta: Function, conflictList?: string[]): () => void;
/**
 * Function which makes assertion by custom condition. Function throws an error when assertion doesn't meet the spec.
 *
 * @param {Function} condition Function with custom logic. The condition has to return boolean values.
 * @param {string} errorMessage String which describes assertion error.
 */
export declare function assert(condition: () => boolean, errorMessage: string): void;
/**
 * Check if given variable is null or undefined.
 *
 * @param {*} variable Variable to check.
 * @returns {boolean}
 */
export declare function isNullish(variable: unknown): variable is null | undefined;