/** The alphabet, whole: what `toBase64url` can emit and `fromBase64url` will accept. */
export declare const BASE64URL: RegExp;
export declare function toBase64url(bytes: Uint8Array): string;
/** The bytes, or `undefined` for a string outside the alphabet or of an impossible length. */
export declare function fromBase64url(s: string): Uint8Array | undefined;
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