/**
 * This module was copied from https://github.com/honojs/hono/blob/master/src/utils/encode.ts
 */
export declare const encodeBase64: (str: string) => string;
export declare const decodeBase64: (str: string) => string;
export declare function urlSafeBase64(str: string): string;
export declare const encodeBase64URL: (str: string) => string;
export declare const decodeBase64URL: (str: string) => string;
export declare const utf8ToUint8Array: (str: string) => Uint8Array;
export declare const arrayBufferToBase64: (buf: ArrayBuffer) => string;
export declare const arrayBufferToBase64URL: (buf: ArrayBuffer) => Promise<string>;
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