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export declare const encodeBase64: (str: string) => string;export declare const decodeBase64: (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) => Promise<string>;export declare const arrayBufferToBase64URL: (buf: ArrayBuffer) => Promise<string>;