import { TextDecoderFn, TextEncoderFn } from './model';
/** Encode to base64, source from string | number | bigint */
export declare function b64encode(input: string | number | bigint, textEncoder?: TextEncoderFn): string;
/** Decode base64 to string */
export declare function b64decode(base64: string, outputEncoding?: string, textDecoder?: TextDecoderFn): string;
/** Encode to base64, source from ArrayBuffer or Uint8Array */
export declare function b64fromBuffer(buffer: ArrayBuffer | Uint8Array): string;
/**
 * Calculate buffer.byteLength from base64
 *
 * base64 is 4/3 + up to two characters of the original data
 */
export declare function b64byteLength(base64: string): number;
/**
 * Encode to URL-safe base64, source from string | number | bigint.
 * Replace "+" to "-" and "/" to "_", and Remove "=".
 *
 * Note: using b64toURLSafe() for converting base64 string to URL-safe base64 string
 *
 * @see https://en.wikipedia.org/wiki/Base64#URL_applications
 */
export declare function b64urlEncode(input: string, textEncoder?: TextEncoderFn): string;
/**
 * Encode to URL-safe base64, source from ArrayBuffer or Uint8Array
 *
 * @see https://en.wikipedia.org/wiki/Base64#URL_applications
 */
export declare function b64urlFromBuffer(buffer: ArrayBuffer | Uint8Array): string;
/**
 * Decode URL-safe base64 to original string.
 *
 * Note: using b64fromURLSafe() for converting URL-safe base64 string to base64 string
 *
 * @see https://en.wikipedia.org/wiki/Base64#URL_applications
 */
export declare function b64urlDecode(input: string, outputEncoding?: string, textDecoder?: TextDecoderFn): string;