/** Encode a string or Uint8Array to base64. */
export declare function toBase64(input: string | Uint8Array): string;
/** Decode a base64 string to Uint8Array. */
export declare function fromBase64(base64: string): Uint8Array;
/** Decode a base64-encoded UTF-8 string. Runtime-agnostic (no `Buffer` global). */
export declare function base64ToUtf8(base64: string): string;
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