type Class = string | null | undefined | Class[];
export declare const concatClasses: (...classes: Class[]) => string | undefined;
/**
 * Create an array from the src parameter.
 * @param {*} src
 * @returns src, if it is already an array; otherwise, an array containing src.
 */
export declare const toArray: (src: string | string[] | undefined | null) => string[];
/**
 * Should be used to convert from a number between 1 and 12 to the corresponding months name.
 * @param {*} month
 * @returns The name of the month corresponding to the number given.
 */
export declare const MONTH_NAMES: string[];
export declare const getMonthName: (month: string, shorthand?: boolean) => string;
export declare const shortMonthText: (date: string) => string;
export declare const interpolateStringOperations: {
    uppercase: (value: string) => string;
    lowercase: (value: string) => string;
    apostrophize: (value: string) => string;
    increment: (value: number) => number;
    shortMonthText: (value: string) => string;
};
/**
 * Interpolate a string (potentially HTML) with variables.
 * @param {*} template The template string
 * @param {*} variables The values to be used in the interpolation
 * @param {*} fallback (defaults to '')
 * @returns A fully interpolated string.
 * @example
 *  interpolateString('<span>${item.label}</span>', { item: { id: '1', label: 'Item 1' } });
 *  // <span>Item 1</span>
 * @example
 *  interpolateString('<span>${forename} ${surname}</span>', { forename: 'William' }, 'Fallback-Smith');
 *  // <span>William Fallback-Smith</span>
 */
export declare const interpolateString: (template: any, variables: any, fallback?: string) => string;
/**
 * Should be used for easy handling of BEM classes.
 * @param {*} block
 * @param {*} blockModifiers
 * @param {*} blockExtra
 * @returns A function that will itself return a string representation of the classes to apply to an element.
 */
export declare const classBuilder: (block: string, blockModifiers: string | string[] | null | undefined, blockExtra?: string[] | string | null) => (element?: string | null, elementModifiers?: string | string[] | null | undefined, elementExtra?: string[] | string | null | undefined) => string | undefined;
export declare const itemLabel: (structure: {
    value: string;
    label: string;
    format?: string | undefined;
} | undefined | null) => (item: any) => any;
/**
 * Takes an array and returns a string containing the entries in the array
 * written out as a list.
 *
 * e.g. toWrittenList([ 'Bob', 'Sally', 'Fred'])
 *      > Bob, Sally and Fred
 *
 * e.g. toWrittenList([ 'jpeg', 'png', 'tif'], ' or', true)
 *      > JPEG, PNG or TIF
 *
 * @param {Array} array The array of entries to write as a list.
 * @param {string} finalSeparator The string to use before the final entry, defaults to ' and'.
 * @param {Boolean} uppercase Whether entries should be made uppercase.
 * @returns The array as a written list.
 */
export declare const toWrittenList: (array: string[], finalSeparator?: string, uppercase?: boolean) => string;
/**
 * Takes a value in bytes and returns the written version of that
 * amount.
 *
 * e.g. toWrittenBytes(10500)
 *      > 10.50KB
 *
 * e.g. toWrittenBytes(25817000, 1)
 *      > 25.8MB
 *
 * @param {number} amount The amount to write out, in bytes.
 * @param {number} decimals The number of decimal places to use, defaults to 2.
 * @returns A written string of the given amount.
 */
export declare const toWrittenBytes: (amount: number | string, decimals?: number) => string;
export declare const COMPONENT_TYPES: {
    DETAILS: string;
    FILE_UPLOAD: string;
    INPUT: string;
    LABEL: string;
    TEXT_AREA: string;
};
export declare const cleanHtmlAttributes: (attrs: Record<string, unknown>, type?: string) => {
    [k: string]: unknown;
};
declare const Utils: {
    classBuilder: (block: string, blockModifiers: string | string[] | null | undefined, blockExtra?: string[] | string | null) => (element?: string | null, elementModifiers?: string | string[] | null | undefined, elementExtra?: string[] | string | null | undefined) => string | undefined;
    cleanHtmlAttributes: (attrs: Record<string, unknown>, type?: string) => {
        [k: string]: unknown;
    };
    getMonthName: (month: string, shorthand?: boolean) => string;
    interpolateString: (template: any, variables: any, fallback?: string) => string;
    toArray: (src: string | string[] | undefined | null) => string[];
    itemLabel: (structure: {
        value: string;
        label: string;
        format?: string | undefined;
    } | undefined | null) => (item: any) => any;
    toWrittenList: (array: string[], finalSeparator?: string, uppercase?: boolean) => string;
    toWrittenBytes: (amount: number | string, decimals?: number) => string;
};
export default Utils;