import { ChartRenderOption } from "../typing/options";
export declare type MaybeStringOrNumber = string | number | undefined | null;
/**
 * Type safe and null safe way to transform, filter and format an input value, e.g. parse a Date from a string,
 * rejecting invalid dates, and formatting it as a localized string. If the input value is undefined, or the parseFn
 * returns undefined, the function returns undefined.
 * @param input
 * @param parseFn an optional function to transform and/or filter the input value.
 * @param formatFn an optional function to format the parsed input value.
 * @returns {string} a formatted string representation of the input, or undefined.
 */
export declare function parseAndFormat<S, T>(input: S | undefined, parseFn: ((_: S) => T), formatFn?: ((_: T) => string | undefined)): string | undefined;
export declare function parseNonEmpty(input: string): string | undefined;
export declare function parseDate(input: string): Date | undefined;
export declare function parseNonNegative(input: MaybeStringOrNumber): number | undefined;
export declare function parsePositive(input: MaybeStringOrNumber): number | undefined;
export declare function formatMilliseconds(millis: number | undefined): string | undefined;
export declare function formatSeconds(seconds: number | undefined): string | undefined;
export declare function formatDateLocalized(date: Date | undefined): string | undefined;
export declare function formatBytes(bytes: number | undefined): string;
/**
 * Escapes unsafe characters in a string to render safely in HTML
 * @param  {string} unsafe - string to be rendered in HTML
 */
export declare function escapeHtml(unsafe?: MaybeStringOrNumber | boolean): string;
/** returns a cleaned http:// or https:// based URL  */
export declare function sanitizeUrlForLink(unsafeUrl: string): string;
/**  returns cleaned sting - stipps out not a-zA-Z0-9 */
export declare function sanitizeAlphaNumeric(unsafe: string | number): string;
/** Ensures `input` is casted to `number` */
export declare function toInt(input: MaybeStringOrNumber): number | undefined;
/** Validates the `ChartOptions` attributes types */
export declare function validateOptions(options: ChartRenderOption): ChartRenderOption;