/**
 * Decode a base64-encoded byte sequence into the original bytes.
 * @param input - Uint8Array holding the base64 representation (one byte per
 *   ASCII character, length must be a multiple of 4, `=` padding allowed).
 * @returns a Uint8Array containing the decoded bytes.
 */
export declare function decode(input: Uint8Array): Uint8Array;
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