/**
 * This is a small util that is used to transform a search string with common
 * patterns.
 *
 * @param value The string to transform
 * @param lowercase Boolean if the value should be lowercased for
 * case-insensitive searches
 * @param trim Boolean if the leading and trailing whitespace should be trimmed
 * @param ignoreWhitespace Boolean if all whitespace should be ignored. This
 * will take precedence over the `trim` parameter if set to true.
 * @return The transformed search string
 * @private
 */
export declare function getSearchString(value: string, lowercase?: boolean, trim?: boolean, ignoreWhitespace?: boolean): string;
/**
 * The default implementation of the getItemValue search option that will
 * attempt to "stringify" any unknown item as a string.
 *
 * @param item The current item to transform
 * @param valueKey The key to use that should hold the value if the item is an
 * object
 * @return the item as a string
 * @private
 */
export declare function getItemValue(item: unknown, valueKey?: string): string;
/**
 * A function that will get a string value from each item. The default
 * implementation will:
 *
 * - return a number as a string
 * - return a string as itself
 * - return the result of item() if it is a function (this will also be used if
 *   the `valueKey` on an object is a function).
 * - return item[valueKey] if it's an object (this uses typeof item === "object")
 * - return the empty string for all other data types
 */
export declare type GetItemValue<T = unknown> = (item: T, valueKey: string) => string;
export interface BaseSearchOptions<T = unknown> {
    /**
     * The key to use to get a value string if the item is an object.
     */
    valueKey?: string;
    /**
     * A function that will get a string value from each item. The default
     * implementation will:
     *
     * - return a number as a string
     * - return a string as itself
     * - return the result of item() if it is a function (this will also be used
     *   if the `valueKey` on an object is a function).
     * - return item[valueKey] if it's an object (this uses typeof item === "object")
     * - return the empty string for all other data types
     */
    getItemValue?: GetItemValue<T>;
}
export interface SearchOptions<T = unknown> extends BaseSearchOptions<T> {
    /**
     * Boolean if the query string and each item should have the leading and
     * trailing spaces removed.
     */
    trim?: boolean;
    /**
     * Boolean if all the whitespace should be ignored in the query string and for
     * each item.
     */
    ignoreWhitespace?: boolean;
}
export declare const DEFAULT_GET_ITEM_VALUE: typeof getItemValue;
export declare const DEFAULT_VALUE_KEY = "value";
export declare const DEFAULT_TRIM = true;
export declare const DEFAULT_IGNORE_WHITESPACE = false;
export declare const DEFAULT_SEARCH_RESET_TIME = 500;
export declare const DEFAULT_SEARCH_OPTIONS: Required<SearchOptions>;