/**
 * Encode a string as standard base64. Latin-1 input (all code points <= 0xFF)
 * is encoded with btoa's binary-string semantics; input outside Latin-1 falls
 * back to UTF-8 bytes. Callers that need guaranteed UTF-8 bytes regardless of
 * input (e.g. data: URLs decoded as UTF-8) should use
 * `encodeBase64Bytes(new TextEncoder().encode(value))` instead.
 */
export declare function encodeBase64(value: string): string;
/** Encode raw bytes as standard base64. */
export declare function encodeBase64Bytes(bytes: Uint8Array): string;
/** Encode a string as unpadded base64url. */
export declare function base64urlEncode(input: string): string;
/** Encode raw bytes as unpadded base64url. */
export declare function base64urlEncodeBytes(bytes: Uint8Array): string;
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