/** UTF-8 decoding for file bytes and encoding only for the iframe's script payload. */
/**
 * Decode complete UTF-8 text, rejecting invalid byte sequences.
 * @param data - complete UTF-8 bytes.
 * @returns decoded text; invalid UTF-8 throws.
 */
export declare function decodeText(data: Uint8Array<ArrayBuffer>): string;
/**
 * Encode Unicode text for the iframe's base64 payload.
 * @param text - Unicode text.
 * @returns base64 of its UTF-8 bytes.
 */
export declare function encodeText(text: string): string;
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